use restrict everywhere it's required by c99 and/or posix 2008

to deal with the fact that the public headers may be used with pre-c99
compilers, __restrict is used in place of restrict, and defined
appropriately for any supported compiler. we also avoid the form
[restrict] since older versions of gcc rejected it due to a bug in the
original c99 standard, and instead use the form *restrict.

include/aio.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #include <signal.h>
 #include <time.h>
 
@@ -46,7 +52,7 @@ int aio_cancel(int, struct aiocb *);
 int aio_suspend(const struct aiocb *const [], int, const struct timespec *);
 int aio_fsync(int, struct aiocb *);
 
-int lio_listio(int, struct aiocb *const [], int, struct sigevent *);
+int lio_listio(int, struct aiocb *__restrict const *__restrict, int, struct sigevent *__restrict);
 
 #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
 #define aiocb64 aiocb

include/arpa/inet.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #include <netinet/in.h>
 #include <inttypes.h>
 
@@ -24,8 +30,8 @@ uint16_t ntohs(uint16_t);
 
 in_addr_t inet_addr (const char *);
 char *inet_ntoa (struct in_addr);
-int inet_pton (int, const char *, void *);
+int inet_pton (int, const char *__restrict, void *__restrict);
-const char *inet_ntop (int, const void *, char *, socklen_t);
+const char *inet_ntop (int, const void *__restrict, char *__restrict, socklen_t);
 
 int inet_aton (const char *, struct in_addr *); /* nonstandard but widely used */
 

include/dirent.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_ino_t
 #define __NEED_off_t
 #ifdef _BSD_SOURCE
@@ -30,7 +36,7 @@ int            closedir(DIR *);
 DIR           *fdopendir(int);
 DIR           *opendir(const char *);
 struct dirent *readdir(DIR *);
-int            readdir_r(DIR *, struct dirent *, struct dirent **);
+int            readdir_r(DIR *__restrict, struct dirent *__restrict, struct dirent **__restrict);
 void           rewinddir(DIR *);
 void           seekdir(DIR *, long);
 long           telldir(DIR *);

include/dlfcn.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define RTLD_LAZY   1
 #define RTLD_NOW    2
 #define RTLD_GLOBAL 256
@@ -16,7 +22,7 @@ extern "C" {
 int    dlclose(void *);
 char  *dlerror(void);
 void  *dlopen(const char *, int);
-void  *dlsym(void *, const char *);
+void  *dlsym(void *__restrict, const char *__restrict);
 
 #ifdef _GNU_SOURCE
 typedef struct {

include/glob.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_size_t
 
 #include <bits/alltypes.h>
@@ -17,7 +23,7 @@ typedef struct {
 	void *__dummy2[5];
 } glob_t;
 
-int  glob(const char *, int, int (*)(const char *, int), glob_t *);
+int  glob(const char *__restrict, int, int (*)(const char *, int), glob_t *__restrict);
 void globfree(glob_t *);
 
 #define GLOB_ERR      0x01

include/iconv.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_size_t
 
 #include <bits/alltypes.h>
@@ -12,7 +18,7 @@ extern "C" {
 typedef void *iconv_t;
 
 iconv_t iconv_open(const char *, const char *);
-size_t iconv(iconv_t, char **, size_t *, char **, size_t *);
+size_t iconv(iconv_t, char **__restrict, size_t *__restrict, char **__restrict, size_t *__restrict);
 int iconv_close(iconv_t);
 
 #ifdef __cplusplus

include/inttypes.h

@@ -10,16 +10,22 @@ extern "C" {
 #define __NEED_wchar_t
 #include <bits/alltypes.h>
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 typedef struct { intmax_t quot, rem; } imaxdiv_t;
 
 intmax_t imaxabs(intmax_t);
 imaxdiv_t imaxdiv(intmax_t, intmax_t);
 
-intmax_t strtoimax(const char *, char **, int);
+intmax_t strtoimax(const char *__restrict, char **__restrict, int);
-uintmax_t strtoumax(const char *, char **, int);
+uintmax_t strtoumax(const char *__restrict, char **__restrict, int);
 
-intmax_t wcstoimax(const wchar_t *, wchar_t **, int);
+intmax_t wcstoimax(const wchar_t *__restrict, wchar_t **__restrict, int);
-uintmax_t wcstoumax(const wchar_t *, wchar_t **, int);
+uintmax_t wcstoumax(const wchar_t *__restrict, wchar_t **__restrict, int);
 
 #if !defined __cplusplus || defined __STDC_FORMAT_MACROS
 

include/monetary.h

@@ -5,14 +5,20 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_ssize_t
 #define __NEED_size_t
 #define __NEED_locale_t
 
 #include <bits/alltypes.h>
 
-ssize_t strfmon(char *, size_t, const char *, ...);
+ssize_t strfmon(char *__restrict, size_t, const char *__restrict, ...);
-ssize_t strfmon_l(char *, size_t, locale_t, const char *, ...);
+ssize_t strfmon_l(char *__restrict, size_t, locale_t, const char *__restrict, ...);
 
 #ifdef __cplusplus
 }

include/mqueue.h

@@ -4,6 +4,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_size_t
 #define __NEED_ssize_t
 #define __NEED_pthread_attr_t
@@ -23,8 +29,8 @@ int mq_notify(mqd_t, const struct sigevent *);
 mqd_t mq_open(const char *, int, ...);
 ssize_t mq_receive(mqd_t, char *, size_t, unsigned *);
 int mq_send(mqd_t, const char *, size_t, unsigned);
-int mq_setattr(mqd_t, const struct mq_attr *, struct mq_attr *);
+int mq_setattr(mqd_t, const struct mq_attr *__restrict, struct mq_attr *__restrict);
-ssize_t mq_timedreceive(mqd_t, char *, size_t, unsigned *, const struct timespec *);
+ssize_t mq_timedreceive(mqd_t, char *__restrict, size_t, unsigned *__restrict, const struct timespec *__restrict);
 int mq_timedsend(mqd_t, const char *, size_t, unsigned, const struct timespec *);
 int mq_unlink(const char *);
 

include/netdb.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define __NEED_size_t
 #endif
@@ -55,9 +61,9 @@ struct addrinfo
 #define EAI_SYSTEM     -11
 #define EAI_OVERFLOW   -12
 
-int getaddrinfo (const char *, const char *, const struct addrinfo *, struct addrinfo **);
+int getaddrinfo (const char *__restrict, const char *__restrict, const struct addrinfo *__restrict, struct addrinfo **__restrict);
 void freeaddrinfo (struct addrinfo *);
-int getnameinfo (const struct sockaddr *, socklen_t, char *, socklen_t, char *, socklen_t, int);
+int getnameinfo (const struct sockaddr *__restrict, socklen_t, char *__restrict, socklen_t, char *__restrict, socklen_t, int);
 const char *gai_strerror(int);
 
 

include/pthread.h

@@ -4,6 +4,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_time_t
 #define __NEED_clockid_t
 #define __NEED_struct_timespec
@@ -71,7 +77,7 @@ extern "C" {
 #define PTHREAD_BARRIER_SERIAL_THREAD (-1)
 
 
-int pthread_create(pthread_t *, const pthread_attr_t *, void *(*)(void *), void *);
+int pthread_create(pthread_t *__restrict, const pthread_attr_t *__restrict, void *(*)(void *), void *__restrict);
 int pthread_detach(pthread_t);
 void pthread_exit(void *);
 int pthread_join(pthread_t, void **);
@@ -91,29 +97,29 @@ int pthread_cancel(pthread_t);
 
 int pthread_once(pthread_once_t *, void (*)(void));
 
-int pthread_mutex_init(pthread_mutex_t *, const pthread_mutexattr_t *);
+int pthread_mutex_init(pthread_mutex_t *__restrict, const pthread_mutexattr_t *__restrict);
 int pthread_mutex_lock(pthread_mutex_t *);
 int pthread_mutex_unlock(pthread_mutex_t *);
 int pthread_mutex_trylock(pthread_mutex_t *);
-int pthread_mutex_timedlock(pthread_mutex_t *, const struct timespec *);
+int pthread_mutex_timedlock(pthread_mutex_t *__restrict, const struct timespec *__restrict);
 int pthread_mutex_destroy(pthread_mutex_t *);
 int pthread_mutex_consistent(pthread_mutex_t *);
 
-int pthread_cond_init(pthread_cond_t *, const pthread_condattr_t *);
+int pthread_cond_init(pthread_cond_t *__restrict, const pthread_condattr_t *__restrict);
 int pthread_cond_destroy(pthread_cond_t *);
-int pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
+int pthread_cond_wait(pthread_cond_t *__restrict, pthread_mutex_t *__restrict);
-int pthread_cond_timedwait(pthread_cond_t *, pthread_mutex_t *, const struct timespec *);
+int pthread_cond_timedwait(pthread_cond_t *__restrict, pthread_mutex_t *__restrict, const struct timespec *__restrict);
 int pthread_cond_broadcast(pthread_cond_t *);
 int pthread_cond_signal(pthread_cond_t *);
 
-int pthread_rwlock_init(pthread_rwlock_t *, const pthread_rwlockattr_t *);
+int pthread_rwlock_init(pthread_rwlock_t *__restrict, const pthread_rwlockattr_t *__restrict);
 int pthread_rwlock_destroy(pthread_rwlock_t *);
 int pthread_rwlock_rdlock(pthread_rwlock_t *);
 int pthread_rwlock_tryrdlock(pthread_rwlock_t *);
-int pthread_rwlock_timedrdlock(pthread_rwlock_t *, const struct timespec *);
+int pthread_rwlock_timedrdlock(pthread_rwlock_t *__restrict, const struct timespec *__restrict);
 int pthread_rwlock_wrlock(pthread_rwlock_t *);
 int pthread_rwlock_trywrlock(pthread_rwlock_t *);
-int pthread_rwlock_timedwrlock(pthread_rwlock_t *, const struct timespec *);
+int pthread_rwlock_timedwrlock(pthread_rwlock_t *__restrict, const struct timespec *__restrict);
 int pthread_rwlock_unlock(pthread_rwlock_t *);
 
 int pthread_spin_init(pthread_spinlock_t *, int);
@@ -122,7 +128,7 @@ int pthread_spin_lock(pthread_spinlock_t *);
 int pthread_spin_trylock(pthread_spinlock_t *);
 int pthread_spin_unlock(pthread_spinlock_t *);
 
-int pthread_barrier_init(pthread_barrier_t *, const pthread_barrierattr_t *, unsigned);
+int pthread_barrier_init(pthread_barrier_t *__restrict, const pthread_barrierattr_t *__restrict, unsigned);
 int pthread_barrier_destroy(pthread_barrier_t *);
 int pthread_barrier_wait(pthread_barrier_t *);
 
@@ -134,29 +140,29 @@ int pthread_setspecific(pthread_key_t, const void *);
 int pthread_attr_init(pthread_attr_t *);
 int pthread_attr_destroy(pthread_attr_t *);
 
-int pthread_attr_getguardsize(const pthread_attr_t *, size_t *);
+int pthread_attr_getguardsize(const pthread_attr_t *__restrict, size_t *__restrict);
 int pthread_attr_setguardsize(pthread_attr_t *, size_t);
-int pthread_attr_getstacksize(const pthread_attr_t *, size_t *);
+int pthread_attr_getstacksize(const pthread_attr_t *__restrict, size_t *__restrict);
 int pthread_attr_setstacksize(pthread_attr_t *, size_t);
 int pthread_attr_getdetachstate(const pthread_attr_t *, int *);
 int pthread_attr_setdetachstate(pthread_attr_t *, int);
-int pthread_attr_getstack(const pthread_attr_t *, void **, size_t *);
+int pthread_attr_getstack(const pthread_attr_t *__restrict, void **__restrict, size_t *__restrict);
 int pthread_attr_setstack(pthread_attr_t *, void *, size_t);
-int pthread_attr_getscope(const pthread_attr_t *, int *);
+int pthread_attr_getscope(const pthread_attr_t *__restrict, int *__restrict);
 int pthread_attr_setscope(pthread_attr_t *, int);
-int pthread_attr_getschedpolicy(const pthread_attr_t *, int *);
+int pthread_attr_getschedpolicy(const pthread_attr_t *__restrict, int *__restrict);
 int pthread_attr_setschedpolicy(pthread_attr_t *, int);
-int pthread_attr_getschedparam(const pthread_attr_t *, struct sched_param *);
+int pthread_attr_getschedparam(const pthread_attr_t *__restrict, struct sched_param *__restrict);
-int pthread_attr_setschedparam(pthread_attr_t *, const struct sched_param *);
+int pthread_attr_setschedparam(pthread_attr_t *__restrict, const struct sched_param *__restrict);
-int pthread_attr_getinheritsched(const pthread_attr_t *, int *);
+int pthread_attr_getinheritsched(const pthread_attr_t *__restrict, int *__restrict);
 int pthread_attr_setinheritsched(pthread_attr_t *, int);
 
 int pthread_mutexattr_destroy(pthread_mutexattr_t *);
-int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t *, int *);
+int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t *__restrict, int *__restrict);
-int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *, int *);
+int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *__restrict, int *__restrict);
-int pthread_mutexattr_getpshared(const pthread_mutexattr_t *, int *);
+int pthread_mutexattr_getpshared(const pthread_mutexattr_t *__restrict, int *__restrict);
-int pthread_mutexattr_getrobust(const pthread_mutexattr_t *, int *);
+int pthread_mutexattr_getrobust(const pthread_mutexattr_t *__restrict, int *__restrict);
-int pthread_mutexattr_gettype(const pthread_mutexattr_t *, int *);
+int pthread_mutexattr_gettype(const pthread_mutexattr_t *__restrict, int *__restrict);
 int pthread_mutexattr_init(pthread_mutexattr_t *);
 int pthread_mutexattr_setprioceiling(pthread_mutexattr_t *, int);
 int pthread_mutexattr_setprotocol(pthread_mutexattr_t *, int);
@@ -168,16 +174,16 @@ int pthread_condattr_init(pthread_condattr_t *);
 int pthread_condattr_destroy(pthread_condattr_t *);
 int pthread_condattr_setclock(pthread_condattr_t *, clockid_t);
 int pthread_condattr_setpshared(pthread_condattr_t *, int);
-int pthread_condattr_getclock(const pthread_condattr_t *, clockid_t *);
+int pthread_condattr_getclock(const pthread_condattr_t *__restrict, clockid_t *__restrict);
-int pthread_condattr_getpshared(const pthread_condattr_t *, int *);
+int pthread_condattr_getpshared(const pthread_condattr_t *__restrict, int *__restrict);
 
 int pthread_rwlockattr_init(pthread_rwlockattr_t *);
 int pthread_rwlockattr_destroy(pthread_rwlockattr_t *);
 int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *, int);
-int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *, int *);
+int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *__restrict, int *__restrict);
 
 int pthread_barrierattr_destroy(pthread_barrierattr_t *);
-int pthread_barrierattr_getpshared(const pthread_barrierattr_t *, int *);
+int pthread_barrierattr_getpshared(const pthread_barrierattr_t *__restrict, int *__restrict);
 int pthread_barrierattr_init(pthread_barrierattr_t *);
 int pthread_barrierattr_setpshared(pthread_barrierattr_t *, int);
 

include/regex.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_size_t
 
 #include <bits/alltypes.h>
@@ -47,11 +53,11 @@ typedef struct {
 
 #define REG_ENOSYS      -1
 
-int regcomp(regex_t *, const char *, int);
+int regcomp(regex_t *__restrict, const char *__restrict, int);
-int regexec(const regex_t *, const char *, size_t, regmatch_t [], int);
+int regexec(const regex_t *__restrict, const char *__restrict, size_t, regmatch_t *__restrict, int);
 void regfree(regex_t *);
 
-size_t regerror(int, const regex_t *, char *, size_t);
+size_t regerror(int, const regex_t *__restrict, char *__restrict, size_t);
 
 #ifdef __cplusplus
 }

include/search.h

@@ -5,6 +5,13 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
+
 #define __NEED_size_t
 #include <bits/alltypes.h>
 
@@ -28,7 +35,7 @@ void *lsearch(const void *, void *, size_t *, size_t,
 void *lfind(const void *, const void *, size_t *, size_t,
 	int (*)(const void *, const void *));
 
-void *tdelete(const void *, void **, int(*)(const void *, const void *));
+void *tdelete(const void *__restrict, void **__restrict, int(*)(const void *, const void *));
 void *tfind(const void *, void *const *, int(*)(const void *, const void *));
 void *tsearch(const void *, void **, int (*)(const void *, const void *));
 void twalk(const void *, void (*)(const void *, VISIT, int));

include/semaphore.h

@@ -4,6 +4,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_time_t
 #define __NEED_struct_timespec
 #include <bits/alltypes.h>
@@ -18,11 +24,11 @@ typedef struct {
 
 int    sem_close(sem_t *);
 int    sem_destroy(sem_t *);
-int    sem_getvalue(sem_t *, int *);
+int    sem_getvalue(sem_t *__restrict, int *__restrict);
 int    sem_init(sem_t *, int, unsigned);
 sem_t *sem_open(const char *, int, ...);
 int    sem_post(sem_t *);
-int    sem_timedwait(sem_t *, const struct timespec *);
+int    sem_timedwait(sem_t *__restrict, const struct timespec *__restrict);
 int    sem_trywait(sem_t *);
 int    sem_unlink(const char *);
 int    sem_wait(sem_t *);

include/signal.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)
@@ -165,16 +171,16 @@ int sigaddset(sigset_t *, int);
 int sigdelset(sigset_t *, int);
 int sigismember(const sigset_t *, int);
 
-int sigprocmask(int, const sigset_t *, sigset_t *);
+int sigprocmask(int, const sigset_t *__restrict, sigset_t *__restrict);
 int sigsuspend(const sigset_t *);
-int sigaction(int, const struct sigaction *, struct sigaction *);
+int sigaction(int, const struct sigaction *__restrict, struct sigaction *__restrict);
 int sigpending(sigset_t *);
-int sigwait(const sigset_t *, int *);
+int sigwait(const sigset_t *__restrict, int *__restrict);
-int sigwaitinfo(const sigset_t *, siginfo_t *);
+int sigwaitinfo(const sigset_t *__restrict, siginfo_t *__restrict);
-int sigtimedwait(const sigset_t *, siginfo_t *, const struct timespec *);
+int sigtimedwait(const sigset_t *__restrict, siginfo_t *__restrict, const struct timespec *__restrict);
 int sigqueue(pid_t, int, const union sigval);
 
-int pthread_sigmask(int, const sigset_t *, sigset_t *);
+int pthread_sigmask(int, const sigset_t *__restrict, sigset_t *__restrict);
 int pthread_kill(pthread_t, int);
 
 void psiginfo(const siginfo_t *, const char *);
@@ -184,7 +190,7 @@ void psignal(int, const char *);
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
 int killpg(pid_t, int);
-int sigaltstack(const stack_t *, stack_t *);
+int sigaltstack(const stack_t *__restrict, stack_t *__restrict);
 int sighold(int);
 int sigignore(int);
 int siginterrupt(int, int);

include/spawn.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_mode_t
 #define __NEED_pid_t
 #define __NEED_sigset_t
@@ -33,30 +39,30 @@ typedef struct {
 	int __pad[16];
 } posix_spawn_file_actions_t;
 
-int posix_spawn(pid_t *, const char *, const posix_spawn_file_actions_t *,
+int posix_spawn(pid_t *__restrict, const char *__restrict, const posix_spawn_file_actions_t *,
-	const posix_spawnattr_t *, char *const [], char *const []);
+	const posix_spawnattr_t *__restrict, char *const *__restrict, char *const *__restrict);
-int posix_spawnp(pid_t *, const char *, const posix_spawn_file_actions_t *,
+int posix_spawnp(pid_t *__restrict, const char *__restrict, const posix_spawn_file_actions_t *,
-	const posix_spawnattr_t *, char *const [], char *const []);
+	const posix_spawnattr_t *__restrict, char *const *__restrict, char *const *__restrict);
 
 int posix_spawnattr_init(posix_spawnattr_t *);
 int posix_spawnattr_destroy(posix_spawnattr_t *);
 
 int posix_spawnattr_setflags(posix_spawnattr_t *, short);
-int posix_spawnattr_getflags(const posix_spawnattr_t *, short *);
+int posix_spawnattr_getflags(const posix_spawnattr_t *__restrict, short *__restrict);
 
 int posix_spawnattr_setpgroup(posix_spawnattr_t *, pid_t);
-int posix_spawnattr_getpgroup(const posix_spawnattr_t *, pid_t *);
+int posix_spawnattr_getpgroup(const posix_spawnattr_t *__restrict, pid_t *__restrict);
 
-int posix_spawnattr_setsigmask(posix_spawnattr_t *, const sigset_t *);
+int posix_spawnattr_setsigmask(posix_spawnattr_t *__restrict, const sigset_t *__restrict);
-int posix_spawnattr_getsigmask(const posix_spawnattr_t *, sigset_t *);
+int posix_spawnattr_getsigmask(const posix_spawnattr_t *__restrict, sigset_t *__restrict);
 
-int posix_spawnattr_setsigdefault(posix_spawnattr_t *, const sigset_t *);
+int posix_spawnattr_setsigdefault(posix_spawnattr_t *__restrict, const sigset_t *__restrict);
-int posix_spawnattr_getsigdefault(const posix_spawnattr_t *, sigset_t *);
+int posix_spawnattr_getsigdefault(const posix_spawnattr_t *__restrict, sigset_t *__restrict);
 
 int posix_spawn_file_actions_init(posix_spawn_file_actions_t *);
 int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *);
 
-int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *, int, const char *, int, mode_t);
+int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *__restrict, int, const char *__restrict, int, mode_t);
 int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *, int);
 int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *, int, int);
 

include/stdio.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_FILE
 #define __NEED_va_list
 #define __NEED_size_t
@@ -58,8 +64,8 @@ extern FILE *const stderr;
 #define stdout (stdout)
 #define stderr (stderr)
 
-FILE *fopen(const char *, const char *);
+FILE *fopen(const char *__restrict, const char *__restrict);
-FILE *freopen(const char *, const char *, FILE *);
+FILE *freopen(const char *__restrict, const char *__restrict, FILE *__restrict);
 int fclose(FILE *);
 
 int remove(const char *);
@@ -74,11 +80,11 @@ int fseek(FILE *, long, int);
 long ftell(FILE *);
 void rewind(FILE *);
 
-int fgetpos(FILE *, fpos_t *);
+int fgetpos(FILE *__restrict, fpos_t *__restrict);
 int fsetpos(FILE *, const fpos_t *);
 
-size_t fread(void *, size_t, size_t, FILE *);
+size_t fread(void *__restrict, size_t, size_t, FILE *__restrict);
-size_t fwrite(const void *, size_t, size_t, FILE *);
+size_t fwrite(const void *__restrict, size_t, size_t, FILE *__restrict);
 
 int fgetc(FILE *);
 int getc(FILE *);
@@ -89,35 +95,35 @@ int fputc(int, FILE *);
 int putc(int, FILE *);
 int putchar(int);
 
-char *fgets(char *, int, FILE *);
+char *fgets(char *__restrict, int, FILE *__restrict);
 #if __STDC_VERSION__ < 201112L
 char *gets(char *);
 #endif
 
-int fputs(const char *, FILE *);
+int fputs(const char *__restrict, FILE *__restrict);
 int puts(const char *);
 
-int printf(const char *, ...);
+int printf(const char *__restrict, ...);
-int fprintf(FILE *, const char *, ...);
+int fprintf(FILE *__restrict, const char *__restrict, ...);
-int sprintf(char *, const char *, ...);
+int sprintf(char *__restrict, const char *__restrict, ...);
-int snprintf(char *, size_t, const char *, ...);
+int snprintf(char *__restrict, size_t, const char *__restrict, ...);
 
-int vprintf(const char *, va_list);
+int vprintf(const char *__restrict, va_list);
-int vfprintf(FILE *, const char *, va_list);
+int vfprintf(FILE *__restrict, const char *__restrict, va_list);
-int vsprintf(char *, const char *, va_list);
+int vsprintf(char *__restrict, const char *__restrict, va_list);
-int vsnprintf(char *, size_t, const char *, va_list);
+int vsnprintf(char *__restrict, size_t, const char *__restrict, va_list);
 
-int scanf(const char *, ...);
+int scanf(const char *__restrict, ...);
-int fscanf(FILE *, const char *, ...);
+int fscanf(FILE *__restrict, const char *__restrict, ...);
-int sscanf(const char *, const char *, ...);
+int sscanf(const char *__restrict, const char *__restrict, ...);
-int vscanf(const char *, va_list);
+int vscanf(const char *__restrict, va_list);
-int vfscanf(FILE *, const char *, va_list);
+int vfscanf(FILE *__restrict, const char *__restrict, va_list);
-int vsscanf(const char *, const char *, va_list);
+int vsscanf(const char *__restrict, const char *__restrict, va_list);
 
 void perror(const char *);
 
-int setvbuf(FILE *, char *, int, size_t);
+int setvbuf(FILE *__restrict, char *__restrict, int, size_t);
-void setbuf(FILE *, char *);
+void setbuf(FILE *__restrict, char *__restrict);
 
 char *tmpnam(char *);
 FILE *tmpfile(void);
@@ -125,7 +131,7 @@ FILE *tmpfile(void);
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)
-FILE *fmemopen(void *, size_t, const char *);
+FILE *fmemopen(void *__restrict, size_t, const char *__restrict);
 FILE *open_memstream(char **, size_t *);
 FILE *fdopen(int, const char *);
 FILE *popen(const char *, const char *);
@@ -133,8 +139,8 @@ int pclose(FILE *);
 int fileno(FILE *);
 int fseeko(FILE *, off_t, int);
 off_t ftello(FILE *);
-int dprintf(int, const char *, ...);
+int dprintf(int, const char *__restrict, ...);
-int vdprintf(int, const char *, va_list);
+int vdprintf(int, const char *__restrict, va_list);
 void flockfile(FILE *);
 int ftrylockfile(FILE *);
 void funlockfile(FILE *);
@@ -142,8 +148,8 @@ int getc_unlocked(FILE *);
 int getchar_unlocked(void);
 int putc_unlocked(int, FILE *);
 int putchar_unlocked(int);
-ssize_t getdelim(char **, size_t *, int, FILE *);
+ssize_t getdelim(char **__restrict, size_t *__restrict, int, FILE *__restrict);
-ssize_t getline(char **, size_t *, FILE *);
+ssize_t getline(char **__restrict, size_t *__restrict, FILE *__restrict);
 int renameat(int, const char *, int, const char *);
 char *ctermid(char *);
 #define L_ctermid 20

include/stdlib.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #undef NULL
 #ifdef __cplusplus
 #define NULL 0
@@ -22,14 +28,14 @@ long atol (const char *);
 long long atoll (const char *);
 double atof (const char *);
 
-float strtof (const char *, char **);
+float strtof (const char *__restrict, char **__restrict);
-double strtod (const char *, char **);
+double strtod (const char *__restrict, char **__restrict);
-long double strtold (const char *, char **);
+long double strtold (const char *__restrict, char **__restrict);
 
-long strtol (const char *, char **, int);
+long strtol (const char *__restrict, char **__restrict, int);
-unsigned long strtoul (const char *, char **, int);
+unsigned long strtoul (const char *__restrict, char **__restrict, int);
-long long strtoll (const char *, char **, int);
+long long strtoll (const char *__restrict, char **__restrict, int);
-unsigned long long strtoull (const char *, char **, int);
+unsigned long long strtoull (const char *__restrict, char **__restrict, int);
 
 int rand (void);
 void srand (unsigned);
@@ -67,10 +73,10 @@ ldiv_t ldiv (long, long);
 lldiv_t lldiv (long long, long long);
 
 int mblen (const char *, size_t);
-int mbtowc (wchar_t *, const char *, size_t);
+int mbtowc (wchar_t *__restrict, const char *__restrict, size_t);
 int wctomb (char *, wchar_t);
-size_t mbstowcs (wchar_t *, const char *, size_t);
+size_t mbstowcs (wchar_t *__restrict, const char *__restrict, size_t);
-size_t wcstombs (char *, const wchar_t *, size_t);
+size_t wcstombs (char *__restrict, const wchar_t *__restrict, size_t);
 
 #define EXIT_FAILURE 1
 #define EXIT_SUCCESS 0
@@ -108,7 +114,7 @@ int rand_r (unsigned *);
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)
-char *realpath (const char *, char *);
+char *realpath (const char *__restrict, char *__restrict);
 long int random (void);
 void srandom (unsigned int);
 char *initstate (unsigned int, char *, size_t);

include/string.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #undef NULL
 #ifdef __cplusplus
 #define NULL 0
@@ -21,23 +27,23 @@ extern "C" {
 
 #include <bits/alltypes.h>
 
-void *memcpy (void *, const void *, size_t);
+void *memcpy (void *__restrict, const void *__restrict, size_t);
 void *memmove (void *, const void *, size_t);
 void *memset (void *, int, size_t);
 int memcmp (const void *, const void *, size_t);
 void *memchr (const void *, int, size_t);
 
-char *strcpy (char *, const char *);
+char *strcpy (char *__restrict, const char *__restrict);
-char *strncpy (char *, const char *, size_t);
+char *strncpy (char *__restrict, const char *__restrict, size_t);
 
-char *strcat (char *, const char *);
+char *strcat (char *__restrict, const char *__restrict);
-char *strncat (char *, const char *, size_t);
+char *strncat (char *__restrict, const char *__restrict, size_t);
 
 int strcmp (const char *, const char *);
 int strncmp (const char *, const char *, size_t);
 
 int strcoll (const char *, const char *);
-size_t strxfrm (char *, const char *, size_t);
+size_t strxfrm (char *__restrict, const char *__restrict, size_t);
 
 char *strchr (const char *, int);
 char *strrchr (const char *, int);
@@ -46,7 +52,7 @@ size_t strcspn (const char *, const char *);
 size_t strspn (const char *, const char *);
 char *strpbrk (const char *, const char *);
 char *strstr (const char *, const char *);
-char *strtok (char *, const char *);
+char *strtok (char *__restrict, const char *__restrict);
 
 size_t strlen (const char *);
 
@@ -59,22 +65,22 @@ char *strerror (int);
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)
-char *strtok_r (char *, const char *, char **);
+char *strtok_r (char *__restrict, const char *__restrict, char **__restrict);
 int strerror_r (int, char *, size_t);
-char *stpcpy(char *, const char *);
+char *stpcpy(char *__restrict, const char *__restrict);
-char *stpncpy(char *, const char *, size_t);
+char *stpncpy(char *__restrict, const char *__restrict, size_t);
 size_t strnlen (const char *, size_t);
 char *strdup (const char *);
 char *strndup (const char *, size_t);
 char *strsignal(int);
 char *strerror_l (int, locale_t);
 int strcoll_l (const char *, const char *, locale_t);
-size_t strxfrm_l (char *, const char *, size_t, locale_t);
+size_t strxfrm_l (char *__restrict, const char *__restrict, size_t, locale_t);
 #endif
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)
-void *memccpy (void *, const void *, int, size_t);
+void *memccpy (void *__restrict, const void *__restrict, int, size_t);
 #endif
 
 #ifdef _BSD_SOURCE

include/sys/select.h

@@ -4,6 +4,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_size_t
 #define __NEED_time_t
 #define __NEED_suseconds_t
@@ -27,8 +33,8 @@ typedef struct
 #define FD_CLR(d, s)   ((s)->fds_bits[(d)/(8*sizeof(long))] &= ~(1UL<<((d)%(8*sizeof(long)))))
 #define FD_ISSET(d, s) !!((s)->fds_bits[(d)/(8*sizeof(long))] & (1UL<<((d)%(8*sizeof(long)))))
 
-int select (int, fd_set *, fd_set *, fd_set *, struct timeval *);
+int select (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, struct timeval *__restrict);
-int pselect (int, fd_set *, fd_set *, fd_set *, const struct timespec *, const sigset_t *);
+int pselect (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, const struct timespec *__restrict, const sigset_t *__restrict);
 
 
 #ifdef __cplusplus

include/sys/socket.h

@@ -4,6 +4,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_socklen_t
 #define __NEED_sa_family_t
 #define __NEED_size_t
@@ -232,19 +238,19 @@ int shutdown (int, int);
 int bind (int, const struct sockaddr *, socklen_t);
 int connect (int, const struct sockaddr *, socklen_t);
 int listen (int, int);
-int accept (int, struct sockaddr *, socklen_t *);
+int accept (int, struct sockaddr *__restrict, socklen_t *__restrict);
 
-int getsockname (int, struct sockaddr *, socklen_t *);
+int getsockname (int, struct sockaddr *__restrict, socklen_t *__restrict);
-int getpeername (int, struct sockaddr *, socklen_t *);
+int getpeername (int, struct sockaddr *__restrict, socklen_t *__restrict);
 
 ssize_t send (int, const void *, size_t, int);
 ssize_t recv (int, void *, size_t, int);
 ssize_t sendto (int, const void *, size_t, int, const struct sockaddr *, socklen_t);
-ssize_t recvfrom (int, void *, size_t, int, struct sockaddr *, socklen_t *);
+ssize_t recvfrom (int, void *__restrict, size_t, int, struct sockaddr *__restrict, socklen_t *__restrict);
 ssize_t sendmsg (int, const struct msghdr *, int);
 ssize_t recvmsg (int, struct msghdr *, int);
 
-int getsockopt (int, int, int, void *, socklen_t *);
+int getsockopt (int, int, int, void *__restrict, socklen_t *__restrict);
 int setsockopt (int, int, int, const void *, socklen_t);
 
 int sockatmark (int);

include/sys/stat.h

@@ -4,6 +4,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_dev_t
 #define __NEED_ino_t
 #define __NEED_mode_t
@@ -68,10 +74,10 @@ extern "C" {
 #define UTIME_NOW  0x3fffffff
 #define UTIME_OMIT 0x3ffffffe
 
-int stat(const char *, struct stat *);
+int stat(const char *__restrict, struct stat *__restrict);
 int fstat(int, struct stat *);
-int lstat(const char *, struct stat *);
+int lstat(const char *__restrict, struct stat *__restrict);
-int fstatat(int, const char *, struct stat *, int);
+int fstatat(int, const char *__restrict, struct stat *__restrict, int);
 int chmod(const char *, mode_t);
 int fchmod(int, mode_t);
 int fchmodat(int, const char *, mode_t, int);

include/sys/statvfs.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_fsblkcnt_t
 #define __NEED_fsfilcnt_t
 #include <bits/alltypes.h>
@@ -26,7 +32,7 @@ struct statvfs {
 	int __reserved[6];
 };
 
-int statvfs (const char *, struct statvfs *);
+int statvfs (const char *__restrict, struct statvfs *__restrict);
 int fstatvfs (int, struct statvfs *);
 
 #define ST_RDONLY 1

include/sys/time.h

@@ -4,9 +4,15 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #include <sys/select.h>
 
-int gettimeofday (struct timeval *, void *);
+int gettimeofday (struct timeval *__restrict, void *__restrict);
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)
@@ -22,7 +28,7 @@ struct itimerval
 };
 
 int getitimer (int, struct itimerval *);
-int setitimer (int, const struct itimerval *, struct itimerval *);
+int setitimer (int, const struct itimerval *__restrict, struct itimerval *__restrict);
 int utimes (const char *, const struct timeval [2]);
 
 #endif

include/time.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #undef NULL
 #ifdef __cplusplus
 #define NULL 0
@@ -48,7 +54,7 @@ clock_t clock (void);
 time_t time (time_t *);
 double difftime (time_t, time_t);
 time_t mktime (struct tm *);
-size_t strftime (char *, size_t, const char *, const struct tm *);
+size_t strftime (char *__restrict, size_t, const char *__restrict, const struct tm *__restrict);
 struct tm *gmtime (const time_t *);
 struct tm *localtime (const time_t *);
 char *asctime (const struct tm *);
@@ -61,11 +67,11 @@ char *ctime (const time_t *);
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)
 
-size_t strftime_l (char *, size_t, const char *, const struct tm *, locale_t);
+size_t strftime_l (char *  __restrict, size_t, const char *  __restrict, const struct tm *  __restrict, locale_t);
 
-struct tm *gmtime_r (const time_t *, struct tm *);
+struct tm *gmtime_r (const time_t *__restrict, struct tm *__restrict);
-struct tm *localtime_r (const time_t *, struct tm *);
+struct tm *localtime_r (const time_t *__restrict, struct tm *__restrict);
-char *asctime_r (const struct tm *, char *);
+char *asctime_r (const struct tm *__restrict, char *__restrict);
 char *ctime_r (const time_t *, char *);
 
 void tzset (void);
@@ -91,9 +97,9 @@ int clock_nanosleep (clockid_t, int, const struct timespec *, struct timespec *)
 int clock_getcpuclockid (pid_t, clockid_t *);
 
 struct sigevent;
-int timer_create (clockid_t, struct sigevent *, timer_t *);
+int timer_create (clockid_t, struct sigevent *__restrict, timer_t *__restrict);
 int timer_delete (timer_t);
-int timer_settime (timer_t, int, const struct itimerspec *, struct itimerspec *);
+int timer_settime (timer_t, int, const struct itimerspec *__restrict, struct itimerspec *__restrict);
 int timer_gettime (timer_t, struct itimerspec *);
 int timer_getoverrun (timer_t);
 
@@ -101,7 +107,7 @@ int timer_getoverrun (timer_t);
 
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
-char *strptime (const char *, const char *, struct tm *);
+char *strptime (const char *__restrict, const char *__restrict, struct tm *__restrict);
 extern int daylight;
 extern long timezone;
 extern char *tzname[2];

include/unistd.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define STDIN_FILENO  0
 #define STDOUT_FILENO 1
 #define STDERR_FILENO 2
@@ -52,8 +58,8 @@ int link(const char *, const char *);
 int linkat(int, const char *, int, const char *, int);
 int symlink(const char *, const char *);
 int symlinkat(const char *, int, const char *);
-ssize_t readlink(const char *, char *, size_t);
+ssize_t readlink(const char *__restrict, char *__restrict, size_t);
-ssize_t readlinkat(int, const char *, char *, size_t);
+ssize_t readlinkat(int, const char *__restrict, char *__restrict, size_t);
 int unlink(const char *);
 int unlinkat(int, const char *, int);
 int rmdir(const char *);
@@ -141,7 +147,7 @@ void sync(void);
 pid_t setpgrp(void);
 char *crypt(const char *, const char *);
 void encrypt(char *, int);
-void swab(const void *, void *, ssize_t);
+void swab(const void *__restrict, void *__restrict, ssize_t);
 #endif
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) \

include/wchar.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_FILE
 #define __NEED_va_list
 #define __NEED_size_t
@@ -39,17 +45,17 @@ typedef struct
 	unsigned __opaque1, __opaque2;
 } mbstate_t;
 
-wchar_t *wcscpy (wchar_t *, const wchar_t *);
+wchar_t *wcscpy (wchar_t *__restrict, const wchar_t *__restrict);
-wchar_t *wcsncpy (wchar_t *, const wchar_t *, size_t);
+wchar_t *wcsncpy (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 
-wchar_t *wcscat (wchar_t *, const wchar_t *);
+wchar_t *wcscat (wchar_t *__restrict, const wchar_t *__restrict);
-wchar_t *wcsncat (wchar_t *, const wchar_t *, size_t);
+wchar_t *wcsncat (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 
 int wcscmp (const wchar_t *, const wchar_t *);
 int wcsncmp (const wchar_t *, const wchar_t *, size_t);
 
 int wcscoll(const wchar_t *, const wchar_t *);
-size_t wcsxfrm (wchar_t *, const wchar_t *, size_t n);
+size_t wcsxfrm (wchar_t *__restrict, const wchar_t *__restrict, size_t n);
 
 wchar_t *wcschr (const wchar_t *, wchar_t);
 wchar_t *wcsrchr (const wchar_t *, wchar_t);
@@ -58,16 +64,16 @@ size_t wcscspn (const wchar_t *, const wchar_t *);
 size_t wcsspn (const wchar_t *, const wchar_t *);
 wchar_t *wcspbrk (const wchar_t *, const wchar_t *);
 
-wchar_t *wcstok (wchar_t *, const wchar_t *, wchar_t **);
+wchar_t *wcstok (wchar_t *__restrict, const wchar_t *__restrict, wchar_t **__restrict);
 
 size_t wcslen (const wchar_t *);
 
-wchar_t *wcsstr (const wchar_t *, const wchar_t *);
+wchar_t *wcsstr (const wchar_t *__restrict, const wchar_t *__restrict);
 wchar_t *wcswcs (const wchar_t *, const wchar_t *);
 
 wchar_t *wmemchr (const wchar_t *, wchar_t, size_t);
 int wmemcmp (const wchar_t *, const wchar_t *, size_t);
-wchar_t *wmemcpy (wchar_t *, const wchar_t *, size_t);
+wchar_t *wmemcpy (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 wchar_t *wmemmove (wchar_t *, const wchar_t *, size_t);
 wchar_t *wmemset (wchar_t *, wchar_t, size_t);
 
@@ -75,44 +81,44 @@ wint_t btowc (int);
 int wctob (wint_t);
 
 int mbsinit (const mbstate_t *);
-size_t mbrtowc (wchar_t *, const char *, size_t, mbstate_t *);
+size_t mbrtowc (wchar_t *__restrict, const char *__restrict, size_t, mbstate_t *__restrict);
-size_t wcrtomb (char *, wchar_t, mbstate_t *);
+size_t wcrtomb (char *__restrict, wchar_t, mbstate_t *__restrict);
 
-size_t mbrlen (const char *, size_t, mbstate_t *);
+size_t mbrlen (const char *__restrict, size_t, mbstate_t *__restrict);
 
-size_t mbsrtowcs (wchar_t *, const char **, size_t, mbstate_t *);
+size_t mbsrtowcs (wchar_t *__restrict, const char **__restrict, size_t, mbstate_t *__restrict);
-size_t wcsrtombs (char *, const wchar_t **, size_t, mbstate_t *);
+size_t wcsrtombs (char *__restrict, const wchar_t **__restrict, size_t, mbstate_t *__restrict);
 
-float wcstof (const wchar_t *, wchar_t **);
+float wcstof (const wchar_t *__restrict, wchar_t **__restrict);
-double wcstod (const wchar_t *, wchar_t **);
+double wcstod (const wchar_t *__restrict, wchar_t **__restrict);
-long double wcstold (const wchar_t *, wchar_t **);
+long double wcstold (const wchar_t *__restrict, wchar_t **__restrict);
 
-long wcstol (const wchar_t *, wchar_t **, int);
+long wcstol (const wchar_t *__restrict, wchar_t **__restrict, int);
-unsigned long wcstoul (const wchar_t *, wchar_t **, int);
+unsigned long wcstoul (const wchar_t *__restrict, wchar_t **__restrict, int);
 
-long long wcstoll (const wchar_t *, wchar_t **, int);
+long long wcstoll (const wchar_t *__restrict, wchar_t **__restrict, int);
-unsigned long long wcstoull (const wchar_t *, wchar_t **, int);
+unsigned long long wcstoull (const wchar_t *__restrict, wchar_t **__restrict, int);
 
 
 
 int fwide (FILE *, int);
 
 
-int wprintf (const wchar_t *, ...);
+int wprintf (const wchar_t *__restrict, ...);
-int fwprintf (FILE *, const wchar_t *, ...);
+int fwprintf (FILE *__restrict, const wchar_t *__restrict, ...);
-int swprintf (wchar_t *, size_t, const wchar_t *, ...);
+int swprintf (wchar_t *__restrict, size_t, const wchar_t *__restrict, ...);
 
-int vwprintf (const wchar_t *, va_list);
+int vwprintf (const wchar_t *__restrict, va_list);
-int vfwprintf (FILE *, const wchar_t *, va_list);
+int vfwprintf (FILE *__restrict, const wchar_t *__restrict, va_list);
-int vswprintf (wchar_t *, size_t, const wchar_t *, va_list);
+int vswprintf (wchar_t *__restrict, size_t, const wchar_t *__restrict, va_list);
 
-int wscanf (const wchar_t *, ...);
+int wscanf (const wchar_t *__restrict, ...);
-int fwscanf (FILE *, const wchar_t *, ...);
+int fwscanf (FILE *__restrict, const wchar_t *__restrict, ...);
-int swscanf (const wchar_t *, const wchar_t *, ...);
+int swscanf (const wchar_t *__restrict, const wchar_t *__restrict, ...);
 
-int vwscanf (const wchar_t *, va_list);
+int vwscanf (const wchar_t *__restrict, va_list);
-int vfwscanf (FILE *, const wchar_t *, va_list);
+int vfwscanf (FILE *__restrict, const wchar_t *__restrict, va_list);
-int vswscanf (const wchar_t *, const wchar_t *, va_list);
+int vswscanf (const wchar_t *__restrict, const wchar_t *__restrict, va_list);
 
 wint_t fgetwc (FILE *);
 wint_t getwc (FILE *);
@@ -122,31 +128,31 @@ wint_t fputwc (wchar_t, FILE *);
 wint_t putwc (wchar_t, FILE *);
 wint_t putwchar (wchar_t);
 
-wchar_t *fgetws (wchar_t *, int, FILE *);
+wchar_t *fgetws (wchar_t *__restrict, int, FILE *__restrict);
-int fputws (const wchar_t *, FILE *);
+int fputws (const wchar_t *__restrict, FILE *__restrict);
 
 wint_t ungetwc (wint_t, FILE *);
 
 struct tm;
-size_t wcsftime (wchar_t *, size_t, const wchar_t *, const struct tm *);
+size_t wcsftime (wchar_t *__restrict, size_t, const wchar_t *__restrict, const struct tm *__restrict);
 
 #undef iswdigit
 
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
 FILE *open_wmemstream(wchar_t **, size_t *);
-size_t mbsnrtowcs(wchar_t *, const char **, size_t, size_t, mbstate_t *);
+size_t mbsnrtowcs(wchar_t *__restrict, const char **__restrict, size_t, size_t, mbstate_t *__restrict);
-size_t wcsnrtombs(char *, const wchar_t **, size_t, size_t, mbstate_t *);
+size_t wcsnrtombs(char *__restrict, const wchar_t **__restrict, size_t, size_t, mbstate_t *__restrict);
 wchar_t *wcsdup(const wchar_t *);
 size_t wcsnlen (const wchar_t *, size_t);
-wchar_t *wcpcpy (wchar_t *, const wchar_t *);
+wchar_t *wcpcpy (wchar_t *__restrict, const wchar_t *__restrict);
-wchar_t *wcpncpy (wchar_t *, const wchar_t *, size_t);
+wchar_t *wcpncpy (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 int wcscasecmp(const wchar_t *, const wchar_t *);
 int wcscasecmp_l(const wchar_t *, const wchar_t *, locale_t);
 int wcsncasecmp(const wchar_t *, const wchar_t *, size_t);
 int wcsncasecmp_l(const wchar_t *, const wchar_t *, size_t, locale_t);
 int wcscoll_l(const wchar_t *, const wchar_t *, locale_t);
-size_t wcsxfrm_l(wchar_t *, const wchar_t *, size_t n, locale_t);
+size_t wcsxfrm_l(wchar_t *__restrict, const wchar_t *__restrict, size_t n, locale_t);
 #endif
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)

include/wordexp.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_size_t
 
 #include <bits/alltypes.h>
@@ -30,7 +36,7 @@ typedef struct
 #define WRDE_CMDSUB  4
 #define WRDE_SYNTAX  5
 
-int wordexp (const char *, wordexp_t *, int);
+int wordexp (const char *__restrict, wordexp_t *__restrict, int);
 void wordfree (wordexp_t *);
 
 #ifdef __cplusplus

src/aio/lio_listio.c

@@ -64,7 +64,7 @@ static void *wait_thread(void *p)
 	return 0;
 }
 
-int lio_listio(int mode, struct aiocb *const cbs[], int cnt, struct sigevent *sev)
+int lio_listio(int mode, struct aiocb *restrict const cbs[restrict], int cnt, struct sigevent *restrict sev)
 {
 	int i, ret;
 	struct lio_state *st=0;
@@ -81,7 +81,7 @@ int lio_listio(int mode, struct aiocb *const cbs[], int cnt, struct sigevent *se
 		}
 		st->cnt = cnt;
 		st->sev = sev;
-		memcpy(st->cbs, cbs, cnt*sizeof *cbs);
+		memcpy(st->cbs, (void*) cbs, cnt*sizeof *cbs);
 	}
 
 	for (i=0; i<cnt; i++) {

src/dirent/readdir_r.c

@@ -5,7 +5,7 @@
 #include "__dirent.h"
 #include "libc.h"
 
-int readdir_r(DIR *dir, struct dirent *buf, struct dirent **result)
+int readdir_r(DIR *restrict dir, struct dirent *restrict buf, struct dirent **restrict result)
 {
 	struct dirent *de;
 	int errno_save = errno;

src/ldso/dlsym.c

@@ -1,8 +1,8 @@
 #include <dlfcn.h>
 
-void *__dlsym(void *, const char *, void *);
+void *__dlsym(void *restrict, const char *restrict, void *restrict);
 
-void *dlsym(void *p, const char *s)
+void *dlsym(void *restrict p, const char *restrict s)
 {
 	return __dlsym(p, s, 0);
 }

src/ldso/dynlink.c

@@ -973,7 +973,7 @@ int __dladdr(void *addr, Dl_info *info)
 	return 1;
 }
 
-void *__dlsym(void *p, const char *s, void *ra)
+void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
 {
 	void *res;
 	pthread_rwlock_rdlock(&lock);
@@ -986,7 +986,7 @@ void *dlopen(const char *file, int mode)
 {
 	return 0;
 }
-void *__dlsym(void *p, const char *s, void *ra)
+void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
 {
 	return 0;
 }

src/locale/iconv.c

@@ -139,7 +139,7 @@ static void put_32(unsigned char *s, unsigned c, int e)
 #define mbrtowc_utf8 mbrtowc
 #define wctomb_utf8 wctomb
 
-size_t iconv(iconv_t cd0, char **in, size_t *inb, char **out, size_t *outb)
+size_t iconv(iconv_t cd0, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb)
 {
 	size_t x=0;
 	unsigned long cd = (unsigned long)cd0;

src/locale/strfmon.c

@@ -75,7 +75,7 @@ static ssize_t vstrfmon_l(char *s, size_t n, locale_t loc, const char *fmt, va_l
 	return s-s0;
 }
 
-ssize_t strfmon_l(char *s, size_t n, locale_t loc, const char *fmt, ...)
+ssize_t strfmon_l(char *restrict s, size_t n, locale_t loc, const char *restrict fmt, ...)
 {
 	va_list ap;
 	ssize_t ret;
@@ -88,7 +88,7 @@ ssize_t strfmon_l(char *s, size_t n, locale_t loc, const char *fmt, ...)
 }
 
 
-ssize_t strfmon(char *s, size_t n, const char *fmt, ...)
+ssize_t strfmon(char *restrict s, size_t n, const char *restrict fmt, ...)
 {
 	va_list ap;
 	ssize_t ret;

src/locale/strftime_l.c

@@ -1,7 +1,7 @@
 #include <locale.h>
 #include <time.h>
 
-size_t strftime_l(char *s, size_t n, const char *f, const struct tm *tm, locale_t l)
+size_t strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t l)
 {
 	return strftime(s, n, f, tm);
 }

src/locale/strxfrm.c

@@ -1,7 +1,7 @@
 #include <string.h>
 
 /* collate only by code points */
-size_t strxfrm(char *dest, const char *src, size_t n)
+size_t strxfrm(char *restrict dest, const char *restrict src, size_t n)
 {
 	size_t l = strlen(src);
 	if (n > l) strcpy(dest, src);

src/locale/strxfrm_l.c

@@ -1,6 +1,6 @@
 #include <string.h>
 
-size_t strxfrm_l(char *dest, const char *src, size_t n, locale_t l)
+size_t strxfrm_l(char *restrict dest, const char *restrict src, size_t n, locale_t l)
 {
 	return strxfrm(dest, src, n);
 }

src/locale/wcsxfrm.c

@@ -1,7 +1,7 @@
 #include <wchar.h>
 
 /* collate only by code points */
-size_t wcsxfrm(wchar_t *dest, const wchar_t *src, size_t n)
+size_t wcsxfrm(wchar_t *restrict dest, const wchar_t *restrict src, size_t n)
 {
 	size_t l = wcslen(src);
 	if (l >= n) {

src/locale/wcsxfrm_l.c

@@ -1,6 +1,6 @@
 #include <wchar.h>
 
-size_t wcsxfrm_l(wchar_t *dest, const wchar_t *src, size_t n, locale_t locale)
+size_t wcsxfrm_l(wchar_t *restrict dest, const wchar_t *restrict src, size_t n, locale_t locale)
 {
 	return wcsxfrm(dest, src, n);
 }

src/misc/realpath.c

@@ -6,7 +6,7 @@
 #include <errno.h>
 #include <unistd.h>
 
-char *realpath(const char *filename, char *resolved)
+char *realpath(const char *restrict filename, char *restrict resolved)
 {
 	int fd;
 	ssize_t r;

src/misc/wordexp.c

@@ -147,7 +147,7 @@ static int do_wordexp(const char *s, wordexp_t *we, int flags)
 	return err;
 }
 
-int wordexp(const char *s, wordexp_t *we, int flags)
+int wordexp(const char *restrict s, wordexp_t *restrict we, int flags)
 {
 	int r, cs;
 	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);

src/mq/mq_setattr.c

@@ -1,7 +1,7 @@
 #include <mqueue.h>
 #include "syscall.h"
 
-int mq_setattr(mqd_t mqd, const struct mq_attr *new, struct mq_attr *old)
+int mq_setattr(mqd_t mqd, const struct mq_attr *restrict new, struct mq_attr *restrict old)
 {
 	return syscall(SYS_mq_getsetattr, mqd, new, old);
 }

src/mq/mq_timedreceive.c

@@ -1,7 +1,7 @@
 #include <mqueue.h>
 #include "syscall.h"
 
-ssize_t mq_timedreceive(mqd_t mqd, char *msg, size_t len, unsigned *prio, const struct timespec *at)
+ssize_t mq_timedreceive(mqd_t mqd, char *restrict msg, size_t len, unsigned *restrict prio, const struct timespec *restrict at)
 {
 	return syscall_cp(SYS_mq_timedreceive, mqd, msg, len, prio, at);
 }

src/multibyte/mbrlen.c

@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-size_t mbrlen(const char *s, size_t n, mbstate_t *st)
+size_t mbrlen(const char *restrict s, size_t n, mbstate_t *restrict st)
 {
 	static unsigned internal;
 	return mbrtowc(0, s, n, st ? st : (mbstate_t *)&internal);

src/multibyte/mbrtowc.c

@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-size_t mbrtowc(wchar_t *wc, const char *src, size_t n, mbstate_t *st)
+size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate_t *restrict st)
 {
 	static unsigned internal_state;
 	unsigned c;

src/multibyte/mbsnrtowcs.c

@@ -12,7 +12,7 @@
 
 #include "internal.h"
 
-size_t mbsnrtowcs(wchar_t *wcs, const char **src, size_t n, size_t wn, mbstate_t *st)
+size_t mbsnrtowcs(wchar_t *restrict wcs, const char **restrict src, size_t n, size_t wn, mbstate_t *restrict st)
 {
 	size_t l, cnt=0, n2;
 	wchar_t *ws, wbuf[256];

src/multibyte/mbsrtowcs.c

@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-size_t mbsrtowcs(wchar_t *ws, const char **src, size_t wn, mbstate_t *st)
+size_t mbsrtowcs(wchar_t *restrict ws, const char **restrict src, size_t wn, mbstate_t *restrict st)
 {
 	unsigned c;
 	const unsigned char *s = (const void *)*src;

src/multibyte/mbstowcs.c

@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-size_t mbstowcs(wchar_t *ws, const char *s, size_t wn)
+size_t mbstowcs(wchar_t *restrict ws, const char *restrict s, size_t wn)
 {
 	mbstate_t st = { 0 };
 	return mbsrtowcs(ws, (void*)&s, wn, &st);

src/multibyte/mbtowc.c

@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-int mbtowc(wchar_t *wc, const char *s, size_t n)
+int mbtowc(wchar_t *restrict wc, const char *restrict s, size_t n)
 {
 	mbstate_t st = { 0 };
 	n = mbrtowc(wc, s, n, &st);

src/multibyte/wcrtomb.c

@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-size_t wcrtomb(char *s, wchar_t wc, mbstate_t *st)
+size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict st)
 {
 	if (!s) return 1;
 	if ((unsigned)wc < 0x80) {

src/multibyte/wcsnrtombs.c

@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-size_t wcsnrtombs(char *dst, const wchar_t **wcs, size_t wn, size_t n, mbstate_t *st)
+size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st)
 {
 	size_t l, cnt=0, n2;
 	char *s, buf[256];

src/multibyte/wcsrtombs.c

@@ -11,7 +11,7 @@
 
 #include "internal.h"
 
-size_t wcsrtombs(char *s, const wchar_t **ws, size_t n, mbstate_t *st)
+size_t wcsrtombs(char *restrict s, const wchar_t **restrict ws, size_t n, mbstate_t *restrict st)
 {
 	const wchar_t *ws2;
 	char buf[4];

src/multibyte/wcstombs.c

@@ -11,7 +11,8 @@
 
 #include "internal.h"
 
-size_t wcstombs(char *s, const wchar_t *ws, size_t n)
+size_t wcstombs(char *restrict s, const wchar_t *restrict ws, size_t n)
 {
-	return wcsrtombs(s, &ws, n, 0);
+	const wchar_t * x = ws;
+	return wcsrtombs(s, &x, n, 0);
 }

src/network/accept.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-int accept(int fd, struct sockaddr *addr, socklen_t *len)
+int accept(int fd, struct sockaddr *restrict addr, socklen_t *restrict len)
 {
 	return socketcall_cp(accept, fd, addr, len, 0, 0, 0);
 }

src/network/getaddrinfo.c

@@ -47,7 +47,7 @@ struct aibuf {
 /* Extra slots needed for storing canonical name */
 #define EXTRA ((256+sizeof(struct aibuf)-1)/sizeof(struct aibuf))
 
-int getaddrinfo(const char *host, const char *serv, const struct addrinfo *hint, struct addrinfo **res)
+int getaddrinfo(const char *restrict host, const char *restrict serv, const struct addrinfo *restrict hint, struct addrinfo **restrict res)
 {
 	int flags = hint ? hint->ai_flags : 0;
 	int family = hint ? hint->ai_family : AF_UNSPEC;

src/network/getnameinfo.c

@@ -8,9 +8,9 @@
 #include <arpa/inet.h>
 #include "__dns.h"
 
-int getnameinfo(const struct sockaddr *sa, socklen_t sl,
+int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
-	char *node, socklen_t nodelen,
+	char *restrict node, socklen_t nodelen,
-	char *serv, socklen_t servlen,
+	char *restrict serv, socklen_t servlen,
 	int flags)
 {
 	char buf[256];

src/network/getpeername.c

@@ -1,7 +1,7 @@
 #include <sys/socket.h>
 #include "syscall.h"
 
-int getpeername(int fd, struct sockaddr *addr, socklen_t *len)
+int getpeername(int fd, struct sockaddr *restrict addr, socklen_t *restrict len)
 {
 	return socketcall(getpeername, fd, addr, len, 0, 0, 0);
 }

src/network/getsockname.c

@@ -1,7 +1,7 @@
 #include <sys/socket.h>
 #include "syscall.h"
 
-int getsockname(int fd, struct sockaddr *addr, socklen_t *len)
+int getsockname(int fd, struct sockaddr *restrict addr, socklen_t *restrict len)
 {
 	return socketcall(getsockname, fd, addr, len, 0, 0, 0);
 }

src/network/getsockopt.c

@@ -1,7 +1,7 @@
 #include <sys/socket.h>
 #include "syscall.h"
 
-int getsockopt(int fd, int level, int optname, void *optval, socklen_t *optlen)
+int getsockopt(int fd, int level, int optname, void *restrict optval, socklen_t *restrict optlen)
 {
 	return socketcall(getsockopt, fd, level, optname, optval, optlen, 0);
 }

src/network/inet_ntop.c

@@ -6,7 +6,7 @@
 #include <stdio.h>
 #include <string.h>
 
-const char *inet_ntop(int af, const void *a0, char *s, socklen_t l)
+const char *inet_ntop(int af, const void *restrict a0, char *restrict s, socklen_t l)
 {
 	const unsigned char *a = a0;
 	int i, j, max, best;

src/network/inet_pton.c

@@ -14,7 +14,7 @@ static int hexval(unsigned c)
 	return -1;
 }
 
-int inet_pton(int af, const char *s, void *a0)
+int inet_pton(int af, const char *restrict s, void *restrict a0)
 {
 	uint16_t ip[8];
 	unsigned char *a = a0;

src/network/recvfrom.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-ssize_t recvfrom(int fd, void *buf, size_t len, int flags, struct sockaddr *addr, socklen_t *alen)
+ssize_t recvfrom(int fd, void *restrict buf, size_t len, int flags, struct sockaddr *restrict addr, socklen_t *restrict alen)
 {
 	return socketcall_cp(recvfrom, fd, buf, len, flags, addr, alen);
 }

src/process/posix_spawn.c

@@ -8,11 +8,11 @@
 
 extern char **environ;
 
-int __posix_spawnx(pid_t *res, const char *path,
+int __posix_spawnx(pid_t *restrict res, const char *restrict path,
 	int (*exec)(const char *, char *const *),
 	const posix_spawn_file_actions_t *fa,
-	const posix_spawnattr_t *attr,
+	const posix_spawnattr_t *restrict attr,
-	char *const argv[], char *const envp[])
+	char *const argv[restrict], char *const envp[restrict])
 {
 	pid_t pid;
 	sigset_t oldmask;
@@ -89,10 +89,10 @@ int __posix_spawnx(pid_t *res, const char *path,
 	return 0;
 }
 
-int posix_spawn(pid_t *res, const char *path,
+int posix_spawn(pid_t *restrict res, const char *restrict path,
 	const posix_spawn_file_actions_t *fa,
-	const posix_spawnattr_t *attr,
+	const posix_spawnattr_t *restrict attr,
-	char *const argv[], char *const envp[])
+	char *const argv[restrict], char *const envp[restrict])
 {
 	return __posix_spawnx(res, path, execv, fa, attr, argv, envp);
 }

src/process/posix_spawn_file_actions_addopen.c

@@ -4,7 +4,7 @@
 #include <errno.h>
 #include "fdop.h"
 
-int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *fa, int fd, const char *path, int flags, mode_t mode)
+int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *restrict fa, int fd, const char *restrict path, int flags, mode_t mode)
 {
 	struct fdop *op = malloc(sizeof *op + strlen(path) + 1);
 	if (!op) return ENOMEM;

src/process/posix_spawnattr_getflags.c

@@ -1,6 +1,6 @@
 #include <spawn.h>
 
-int posix_spawnattr_getflags(const posix_spawnattr_t *attr, short *flags)
+int posix_spawnattr_getflags(const posix_spawnattr_t *restrict attr, short *restrict flags)
 {
 	*flags = attr->__flags;
 	return 0;

src/process/posix_spawnattr_getpgroup.c

@@ -1,6 +1,6 @@
 #include <spawn.h>
 
-int posix_spawnattr_getpgroup(const posix_spawnattr_t *attr, pid_t *pgrp)
+int posix_spawnattr_getpgroup(const posix_spawnattr_t *restrict attr, pid_t *restrict pgrp)
 {
 	*pgrp = attr->__pgrp;
 	return 0;

src/process/posix_spawnattr_getsigdefault.c

@@ -1,6 +1,6 @@
 #include <spawn.h>
 
-int posix_spawnattr_getsigdefault(const posix_spawnattr_t *attr, sigset_t *def)
+int posix_spawnattr_getsigdefault(const posix_spawnattr_t *restrict attr, sigset_t *restrict def)
 {
 	*def = attr->__def;
 	return 0;

src/process/posix_spawnattr_getsigmask.c

@@ -1,6 +1,6 @@
 #include <spawn.h>
 
-int posix_spawnattr_getsigmask(const posix_spawnattr_t *attr, sigset_t *mask)
+int posix_spawnattr_getsigmask(const posix_spawnattr_t *restrict attr, sigset_t *restrict mask)
 {
 	*mask = attr->__mask;
 	return 0;

src/process/posix_spawnattr_setsigdefault.c

@@ -1,6 +1,6 @@
 #include <spawn.h>
 
-int posix_spawnattr_setsigdefault(posix_spawnattr_t *attr, const sigset_t *def)
+int posix_spawnattr_setsigdefault(posix_spawnattr_t *restrict attr, const sigset_t *restrict def)
 {
 	attr->__def = *def;
 	return 0;

src/process/posix_spawnattr_setsigmask.c

@@ -1,6 +1,6 @@
 #include <spawn.h>
 
-int posix_spawnattr_setsigmask(posix_spawnattr_t *attr, const sigset_t *mask)
+int posix_spawnattr_setsigmask(posix_spawnattr_t *restrict attr, const sigset_t *restrict mask)
 {
 	attr->__mask = *mask;
 	return 0;

src/process/posix_spawnp.c

@@ -1,15 +1,15 @@
 #include <spawn.h>
 #include <unistd.h>
 
-int __posix_spawnx(pid_t *, const char *,
+int __posix_spawnx(pid_t *restrict, const char *restrict,
 	int (*)(const char *, char *const *),
 	const posix_spawn_file_actions_t *,
-	const posix_spawnattr_t *, char *const [], char *const []);
+	const posix_spawnattr_t *restrict, char *const *restrict, char *const *restrict);
 
-int posix_spawnp(pid_t *res, const char *file,
+int posix_spawnp(pid_t *restrict res, const char *restrict file,
 	const posix_spawn_file_actions_t *fa,
-	const posix_spawnattr_t *attr,
+	const posix_spawnattr_t *restrict attr,
-	char *const argv[], char *const envp[])
+	char *const argv[restrict], char *const envp[restrict])
 {
 	return __posix_spawnx(res, file, execvp, fa, attr, argv, envp);
 }

src/regex/glob.c

@@ -156,7 +156,7 @@ static int sort(const void *a, const void *b)
 	return strcmp(*(const char **)a, *(const char **)b);
 }
 
-int glob(const char *pat, int flags, int (*errfunc)(const char *path, int err), glob_t *g)
+int glob(const char *restrict pat, int flags, int (*errfunc)(const char *path, int err), glob_t *restrict g)
 {
 	const char *p=pat, *d;
 	struct match head = { .next = NULL }, *tail = &head;

src/regex/regcomp.c

@@ -3091,7 +3091,7 @@ tre_ast_to_tnfa(tre_ast_node_t *node, tre_tnfa_transition_t *transitions,
 
 
 int
-regcomp(regex_t *preg, const char *regex, int cflags)
+regcomp(regex_t *restrict preg, const char *restrict regex, int cflags)
 {
   tre_stack_t *stack;
   tre_ast_node_t *tree, *tmp_ast_l, *tmp_ast_r;

src/regex/regerror.c

@@ -26,7 +26,7 @@ static const char messages[] = {
   "\0Unknown error"
 };
 
-size_t regerror(int e, const regex_t *preg, char *buf, size_t size)
+size_t regerror(int e, const regex_t *restrict preg, char *restrict buf, size_t size)
 {
 	const char *s;
 	for (s=messages; e && *s; e--, s+=strlen(s)+1);

src/regex/regexec.c

@@ -977,8 +977,8 @@ tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags,
 */
 
 int
-regexec(const regex_t *preg, const char *string,
+regexec(const regex_t *restrict preg, const char *restrict string,
-	  size_t nmatch, regmatch_t pmatch[], int eflags)
+	  size_t nmatch, regmatch_t pmatch[restrict], int eflags)
 {
   tre_tnfa_t *tnfa = (void *)preg->TRE_REGEX_T_FIELD;
   reg_errcode_t status;

src/select/pselect.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-int pselect(int n, fd_set *rfds, fd_set *wfds, fd_set *efds, const struct timespec *ts, const sigset_t *mask)
+int pselect(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict efds, const struct timespec *restrict ts, const sigset_t *restrict mask)
 {
 	long data[2] = { (long)mask, __SYSCALL_SSLEN };
 	struct timespec ts_tmp;

src/select/select.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-int select(int n, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *tv)
+int select(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict efds, struct timeval *restrict tv)
 {
 	return syscall_cp(SYS_select, n, rfds, wfds, efds, tv);
 }

src/signal/setitimer.c

@@ -1,7 +1,7 @@
 #include <sys/time.h>
 #include "syscall.h"
 
-int setitimer(int which, const struct itimerval *new, struct itimerval *old)
+int setitimer(int which, const struct itimerval *restrict new, struct itimerval *restrict old)
 {
 	return syscall(SYS_setitimer, which, new, old);
 }

src/signal/sigaction.c

@@ -11,7 +11,7 @@ void __restore(), __restore_rt();
 static pthread_t dummy(void) { return 0; }
 weak_alias(dummy, __pthread_self_def);
 
-int __libc_sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
+int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
 {
 	struct k_sigaction ksa;
 	if (sa) {
@@ -31,7 +31,7 @@ int __libc_sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
 	return 0;
 }
 
-int __sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
+int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
 {
 	if (sig-32U < 3) {
 		errno = EINVAL;

src/signal/sigaltstack.c

@@ -2,7 +2,7 @@
 #include <errno.h>
 #include "syscall.h"
 
-int sigaltstack(const stack_t *ss, stack_t *old)
+int sigaltstack(const stack_t *restrict ss, stack_t *restrict old)
 {
 	if (ss) {
 		if (ss->ss_size < MINSIGSTKSZ) {

src/signal/sigprocmask.c

@@ -1,7 +1,7 @@
 #include <signal.h>
 #include <errno.h>
 
-int sigprocmask(int how, const sigset_t *set, sigset_t *old)
+int sigprocmask(int how, const sigset_t *restrict set, sigset_t *restrict old)
 {
 	int r = pthread_sigmask(how, set, old);
 	if (!r) return r;

src/signal/sigtimedwait.c

@@ -3,7 +3,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-int sigtimedwait(const sigset_t *mask, siginfo_t *si, const struct timespec *timeout)
+int sigtimedwait(const sigset_t *restrict mask, siginfo_t *restrict si, const struct timespec *restrict timeout)
 {
 	int ret;
 	do ret = syscall_cp(SYS_rt_sigtimedwait, mask,

src/signal/sigwait.c

@@ -1,7 +1,7 @@
 #include <signal.h>
 #include <stddef.h>
 
-int sigwait(const sigset_t *mask, int *sig)
+int sigwait(const sigset_t *restrict mask, int *restrict sig)
 {
 	siginfo_t si;
 	if (sigtimedwait(mask, &si, NULL) < 0)

src/signal/sigwaitinfo.c

@@ -1,7 +1,7 @@
 #include <signal.h>
 #include <stddef.h>
 
-int sigwaitinfo(const sigset_t *mask, siginfo_t *si)
+int sigwaitinfo(const sigset_t *restrict mask, siginfo_t *restrict si)
 {
 	return sigtimedwait(mask, si, NULL);
 }

src/stat/fstatat.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-int fstatat(int fd, const char *path, struct stat *buf, int flag)
+int fstatat(int fd, const char *restrict path, struct stat *restrict buf, int flag)
 {
 	return syscall(SYS_fstatat, fd, path, buf, flag);
 }

src/stat/lstat.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-int lstat(const char *path, struct stat *buf)
+int lstat(const char *restrict path, struct stat *restrict buf)
 {
 	return syscall(SYS_lstat, path, buf);
 }

src/stat/stat.c

@@ -2,7 +2,7 @@
 #include "syscall.h"
 #include "libc.h"
 
-int stat(const char *path, struct stat *buf)
+int stat(const char *restrict path, struct stat *restrict buf)
 {
 	return syscall(SYS_stat, path, buf);
 }

src/stat/statvfs.c

@@ -39,7 +39,7 @@ static void fixup(struct statvfs *out, const struct statfs *in)
 	out->f_namemax = in->f_namelen;
 }
 
-int statvfs(const char *path, struct statvfs *buf)
+int statvfs(const char *restrict path, struct statvfs *restrict buf)
 {
 	struct statfs kbuf;
 	if (__statfs(path, &kbuf)<0) return -1;

src/stdio/dprintf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int dprintf(int fd, const char *fmt, ...)
+int dprintf(int fd, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/fgetpos.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-int fgetpos(FILE *f, fpos_t *pos)
+int fgetpos(FILE *restrict f, fpos_t *restrict pos)
 {
 	off_t off = __ftello(f);
 	if (off < 0) return -1;

src/stdio/fgets.c

@@ -2,7 +2,7 @@
 
 #define MIN(a,b) ((a)<(b) ? (a) : (b))
 
-char *fgets(char *s, int n, FILE *f)
+char *fgets(char *restrict s, int n, FILE *restrict f)
 {
 	char *p = s;
 	unsigned char *z;

src/stdio/fgetws.c

@@ -2,7 +2,7 @@
 
 wint_t __fgetwc_unlocked(FILE *);
 
-wchar_t *fgetws(wchar_t *s, int n, FILE *f)
+wchar_t *fgetws(wchar_t *restrict s, int n, FILE *restrict f)
 {
 	wchar_t *p = s;
 

src/stdio/fmemopen.c

@@ -67,7 +67,7 @@ static int mclose(FILE *m)
 	return 0;
 }
 
-FILE *fmemopen(void *buf, size_t size, const char *mode)
+FILE *fmemopen(void *restrict buf, size_t size, const char *restrict mode)
 {
 	FILE *f;
 	struct cookie *c;

src/stdio/fopen.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-FILE *fopen(const char *filename, const char *mode)
+FILE *fopen(const char *restrict filename, const char *restrict mode)
 {
 	FILE *f;
 	int fd;

src/stdio/fprintf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int fprintf(FILE *f, const char *fmt, ...)
+int fprintf(FILE *restrict f, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;

src/stdio/fputs.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-int fputs(const char *s, FILE *f)
+int fputs(const char *restrict s, FILE *restrict f)
 {
 	size_t l = strlen(s);
 	if (!l) return 0;

src/stdio/fputws.c

@@ -1,6 +1,6 @@
 #include "stdio_impl.h"
 
-int fputws(const wchar_t *ws, FILE *f)
+int fputws(const wchar_t *restrict ws, FILE *restrict f)
 {
 	unsigned char buf[BUFSIZ];
 	size_t l=0;

src/stdio/fread.c

@@ -2,7 +2,7 @@
 
 #define MIN(a,b) ((a)<(b) ? (a) : (b))
 
-size_t fread(void *destv, size_t size, size_t nmemb, FILE *f)
+size_t fread(void *restrict destv, size_t size, size_t nmemb, FILE *restrict f)
 {
 	unsigned char *dest = destv;
 	size_t len = size*nmemb, l = len, k;

src/stdio/freopen.c

@@ -7,7 +7,7 @@
 /* Locking is not necessary because, in the event of failure, the stream
  * passed to freopen is invalid as soon as freopen is called. */
 
-FILE *freopen(const char *filename, const char *mode, FILE *f)
+FILE *freopen(const char *restrict filename, const char *restrict mode, FILE *restrict f)
 {
 	int fl;
 	FILE *f2;

src/stdio/fscanf.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-int fscanf(FILE *f, const char *fmt, ...)
+int fscanf(FILE *restrict f, const char *restrict fmt, ...)
 {
 	int ret;
 	va_list ap;