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musl/src/conf/sysconf.c

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initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
#include <unistd.h>
#include <limits.h>
#include <errno.h>
sysconf support for dynamic limits (open files and processes)
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#include <sys/resource.h>
correct the sysconf value for RTSIG_MAX this is the number of realtime signals available, not the maximum signal number or total number of signals.
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#include <signal.h>
sysconf support for dynamic limits (open files and processes)
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#include "syscall.h"
support configurable page size on mips, powerpc and microblaze PAGE_SIZE was hardcoded to 4096, which is historically what most systems use, but on several archs it is a kernel config parameter, user space can only know it at execution time from the aux vector. PAGE_SIZE and PAGESIZE are not defined on archs where page size is a runtime parameter, applications should use sysconf(_SC_PAGE_SIZE) to query it. Internally libc code defines PAGE_SIZE to libc.page_size, which is set to aux[AT_PAGESZ] in __init_libc and early in __dynlink as well. (Note that libc.page_size can be accessed without GOT, ie. before relocations are done) Some fpathconf settings are hardcoded to 4096, these should be actually queried from the filesystem using statfs.
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#include "libc.h"
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
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#define JT(x) (-256|(x))
#define VER JT(1)
#define JT_ARG_MAX JT(2)
#define JT_MQ_PRIO_MAX JT(3)
#define JT_PAGE_SIZE JT(4)
#define JT_SEM_VALUE_MAX JT(5)
#define JT_NPROCESSORS_CONF JT(6)
#define JT_NPROCESSORS_ONLN JT(7)
sysconf support for dynamic limits (open files and processes)
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#define RLIM(x) (-32768|(RLIMIT_ ## x))
initial check-in, version 0.5.0
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long sysconf(int name)
{
static const short values[] = {
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
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[_SC_ARG_MAX] = JT_ARG_MAX,
sysconf support for dynamic limits (open files and processes)
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[_SC_CHILD_MAX] = RLIM(NPROC),
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_CLK_TCK] = 100,
[_SC_NGROUPS_MAX] = 32,
sysconf support for dynamic limits (open files and processes)
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[_SC_OPEN_MAX] = RLIM(NOFILE),
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_STREAM_MAX] = -1,
[_SC_TZNAME_MAX] = TZNAME_MAX,
[_SC_JOB_CONTROL] = 1,
[_SC_SAVED_IDS] = 1,
[_SC_REALTIME_SIGNALS] = 1,
[_SC_PRIORITY_SCHEDULING] = -1,
[_SC_TIMERS] = VER,
[_SC_ASYNCHRONOUS_IO] = VER,
[_SC_PRIORITIZED_IO] = -1,
[_SC_SYNCHRONIZED_IO] = -1,
a few more fixes for unistd/sysconf feature reporting
2013-07-27 00:02:39 -04:00
[_SC_FSYNC] = VER,
initial check-in, version 0.5.0
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[_SC_MAPPED_FILES] = VER,
[_SC_MEMLOCK] = VER,
[_SC_MEMLOCK_RANGE] = VER,
[_SC_MEMORY_PROTECTION] = VER,
report presence of ADV and MSG options in unistd.h and sysconf
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[_SC_MESSAGE_PASSING] = VER,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_SEMAPHORES] = VER,
a few more fixes for unistd/sysconf feature reporting
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[_SC_SHARED_MEMORY_OBJECTS] = VER,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_AIO_LISTIO_MAX] = -1,
[_SC_AIO_MAX] = -1,
[_SC_AIO_PRIO_DELTA_MAX] = 0, /* ?? */
[_SC_DELAYTIMER_MAX] = _POSIX_DELAYTIMER_MAX,
[_SC_MQ_OPEN_MAX] = -1,
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
2014-04-15 13:30:20 -04:00
[_SC_MQ_PRIO_MAX] = JT_MQ_PRIO_MAX,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_VERSION] = VER,
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
2014-04-15 13:30:20 -04:00
[_SC_PAGE_SIZE] = JT_PAGE_SIZE,
correct the sysconf value for RTSIG_MAX this is the number of realtime signals available, not the maximum signal number or total number of signals.
2013-09-20 01:49:03 -04:00
[_SC_RTSIG_MAX] = _NSIG - 1 - 31 - 3,
fix sem_open and sem_close to obey posix semantics multiple opens of the same named semaphore must return the same pointer, and only the last close can unmap it. thus the ugly global state keeping track of mappings. the maximum number of distinct named semaphores that can be opened is limited sufficiently small that the linear searches take trivial time, especially compared to the syscall overhead of these functions.
2011-03-10 21:34:19 -05:00
[_SC_SEM_NSEMS_MAX] = SEM_NSEMS_MAX,
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
2014-04-15 13:30:20 -04:00
[_SC_SEM_VALUE_MAX] = JT_SEM_VALUE_MAX,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_SIGQUEUE_MAX] = -1,
[_SC_TIMER_MAX] = -1,
[_SC_BC_BASE_MAX] = _POSIX2_BC_BASE_MAX,
[_SC_BC_DIM_MAX] = _POSIX2_BC_DIM_MAX,
[_SC_BC_SCALE_MAX] = _POSIX2_BC_SCALE_MAX,
[_SC_BC_STRING_MAX] = _POSIX2_BC_STRING_MAX,
[_SC_COLL_WEIGHTS_MAX] = COLL_WEIGHTS_MAX,
[_SC_EQUIV_CLASS_MAX] = -1, /* ?? */
[_SC_EXPR_NEST_MAX] = -1,
[_SC_LINE_MAX] = -1,
[_SC_RE_DUP_MAX] = RE_DUP_MAX,
[_SC_CHARCLASS_NAME_MAX] = -1, /* ?? */
[_SC_2_VERSION] = VER,
[_SC_2_C_BIND] = VER,
[_SC_2_C_DEV] = -1,
[_SC_2_FORT_DEV] = -1,
[_SC_2_FORT_RUN] = -1,
[_SC_2_SW_DEV] = -1,
[_SC_2_LOCALEDEF] = -1,
[_SC_PII] = -1, /* ????????? */
[_SC_PII_XTI] = -1,
[_SC_PII_SOCKET] = -1,
[_SC_PII_INTERNET] = -1,
[_SC_PII_OSI] = -1,
[_SC_POLL] = 1,
[_SC_SELECT] = 1,
[_SC_IOV_MAX] = IOV_MAX,
[_SC_PII_INTERNET_STREAM] = -1,
[_SC_PII_INTERNET_DGRAM] = -1,
[_SC_PII_OSI_COTS] = -1,
[_SC_PII_OSI_CLTS] = -1,
[_SC_PII_OSI_M] = -1,
[_SC_T_IOV_MAX] = -1,
[_SC_THREADS] = VER,
[_SC_THREAD_SAFE_FUNCTIONS] = VER,
[_SC_GETGR_R_SIZE_MAX] = -1,
[_SC_GETPW_R_SIZE_MAX] = -1,
[_SC_LOGIN_NAME_MAX] = 256,
[_SC_TTY_NAME_MAX] = TTY_NAME_MAX,
a few more fixes for unistd/sysconf feature reporting
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[_SC_THREAD_DESTRUCTOR_ITERATIONS] = PTHREAD_DESTRUCTOR_ITERATIONS,
sysconf for PTHREAD_KEYS_MAX
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[_SC_THREAD_KEYS_MAX] = PTHREAD_KEYS_MAX,
better fix sysconf pthread stack min
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[_SC_THREAD_STACK_MIN] = PTHREAD_STACK_MIN,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_THREAD_THREADS_MAX] = -1,
report support of TPS option in unistd.h and sysconf also update another newish feature in sysconf, stackaddr
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[_SC_THREAD_ATTR_STACKADDR] = VER,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_THREAD_ATTR_STACKSIZE] = VER,
report support of TPS option in unistd.h and sysconf also update another newish feature in sysconf, stackaddr
2012-11-11 15:54:20 -05:00
[_SC_THREAD_PRIORITY_SCHEDULING] = VER,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_THREAD_PRIO_INHERIT] = -1,
[_SC_THREAD_PRIO_PROTECT] = -1,
[_SC_THREAD_PROCESS_SHARED] = VER,
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
2014-04-15 13:30:20 -04:00
[_SC_NPROCESSORS_CONF] = JT_NPROCESSORS_CONF,
[_SC_NPROCESSORS_ONLN] = JT_NPROCESSORS_ONLN,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_PHYS_PAGES] = -1,
[_SC_AVPHYS_PAGES] = -1,
[_SC_ATEXIT_MAX] = -1,
[_SC_PASS_MAX] = -1,
[_SC_XOPEN_VERSION] = _XOPEN_VERSION,
[_SC_XOPEN_XCU_VERSION] = _XOPEN_VERSION,
a few more fixes for unistd/sysconf feature reporting
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[_SC_XOPEN_UNIX] = 1,
initial check-in, version 0.5.0
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[_SC_XOPEN_CRYPT] = -1,
[_SC_XOPEN_ENH_I18N] = 1,
[_SC_XOPEN_SHM] = 1,
[_SC_2_CHAR_TERM] = -1,
[_SC_2_C_VERSION] = -1,
[_SC_2_UPE] = -1,
[_SC_XOPEN_XPG2] = -1,
[_SC_XOPEN_XPG3] = -1,
[_SC_XOPEN_XPG4] = -1,
[_SC_CHAR_BIT] = -1,
[_SC_CHAR_MAX] = -1,
[_SC_CHAR_MIN] = -1,
[_SC_INT_MAX] = -1,
[_SC_INT_MIN] = -1,
[_SC_LONG_BIT] = -1,
[_SC_WORD_BIT] = -1,
[_SC_MB_LEN_MAX] = -1,
[_SC_NZERO] = NZERO,
[_SC_SSIZE_MAX] = -1,
[_SC_SCHAR_MAX] = -1,
[_SC_SCHAR_MIN] = -1,
[_SC_SHRT_MAX] = -1,
[_SC_SHRT_MIN] = -1,
[_SC_UCHAR_MAX] = -1,
[_SC_UINT_MAX] = -1,
[_SC_ULONG_MAX] = -1,
[_SC_USHRT_MAX] = -1,
[_SC_NL_ARGMAX] = -1,
[_SC_NL_LANGMAX] = -1,
[_SC_NL_MSGMAX] = -1,
[_SC_NL_NMAX] = -1,
[_SC_NL_SETMAX] = -1,
[_SC_NL_TEXTMAX] = -1,
[_SC_XBS5_ILP32_OFF32] = -1,
[_SC_XBS5_ILP32_OFFBIG] = 2*(sizeof(long)==4)-1,
[_SC_XBS5_LP64_OFF64] = 2*(sizeof(long)==8)-1,
a few more fixes for unistd/sysconf feature reporting
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[_SC_XBS5_LPBIG_OFFBIG] = -1,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_XOPEN_LEGACY] = -1,
[_SC_XOPEN_REALTIME] = -1,
[_SC_XOPEN_REALTIME_THREADS] = -1,
report presence of ADV and MSG options in unistd.h and sysconf
2013-07-26 23:07:54 -04:00
[_SC_ADVISORY_INFO] = VER,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_BARRIERS] = VER,
[_SC_BASE] = -1,
[_SC_C_LANG_SUPPORT] = -1,
[_SC_C_LANG_SUPPORT_R] = -1,
[_SC_CLOCK_SELECTION] = VER,
[_SC_CPUTIME] = VER,
document in sysconf and unistd.h that per-thread cpu clocks exist
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[_SC_THREAD_CPUTIME] = VER,
initial check-in, version 0.5.0
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[_SC_DEVICE_IO] = -1,
[_SC_DEVICE_SPECIFIC] = -1,
[_SC_DEVICE_SPECIFIC_R] = -1,
[_SC_FD_MGMT] = -1,
[_SC_FIFO] = -1,
[_SC_PIPE] = -1,
[_SC_FILE_ATTRIBUTES] = -1,
[_SC_FILE_LOCKING] = -1,
[_SC_FILE_SYSTEM] = -1,
[_SC_MONOTONIC_CLOCK] = VER,
[_SC_MULTI_PROCESS] = -1,
[_SC_SINGLE_PROCESS] = -1,
[_SC_NETWORKING] = -1,
[_SC_READER_WRITER_LOCKS] = VER,
[_SC_SPIN_LOCKS] = VER,
[_SC_REGEXP] = 1,
[_SC_REGEX_VERSION] = -1,
[_SC_SHELL] = 1,
[_SC_SIGNALS] = -1,
report that posix_spawn is supported in unistd.h and sysconf
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[_SC_SPAWN] = VER,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_SPORADIC_SERVER] = -1,
[_SC_THREAD_SPORADIC_SERVER] = -1,
[_SC_SYSTEM_DATABASE] = -1,
[_SC_SYSTEM_DATABASE_R] = -1,
[_SC_TIMEOUTS] = VER,
[_SC_TYPED_MEMORY_OBJECTS] = -1,
[_SC_USER_GROUPS] = -1,
[_SC_USER_GROUPS_R] = -1,
[_SC_2_PBS] = -1,
[_SC_2_PBS_ACCOUNTING] = -1,
[_SC_2_PBS_LOCATE] = -1,
[_SC_2_PBS_MESSAGE] = -1,
[_SC_2_PBS_TRACK] = -1,
[_SC_SYMLOOP_MAX] = SYMLOOP_MAX,
[_SC_STREAMS] = 0,
[_SC_2_PBS_CHECKPOINT] = -1,
[_SC_V6_ILP32_OFF32] = -1,
[_SC_V6_ILP32_OFFBIG] = 2*(sizeof(long)==4)-1,
[_SC_V6_LP64_OFF64] = 2*(sizeof(long)==8)-1,
a few more fixes for unistd/sysconf feature reporting
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[_SC_V6_LPBIG_OFFBIG] = -1,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_HOST_NAME_MAX] = HOST_NAME_MAX,
[_SC_TRACE] = -1,
[_SC_TRACE_EVENT_FILTER] = -1,
[_SC_TRACE_INHERIT] = -1,
[_SC_TRACE_LOG] = -1,
[_SC_IPV6] = VER,
[_SC_RAW_SOCKETS] = VER,
[_SC_V7_ILP32_OFF32] = -1,
[_SC_V7_ILP32_OFFBIG] = 2*(sizeof(long)==4)-1,
[_SC_V7_LP64_OFF64] = 2*(sizeof(long)==8)-1,
a few more fixes for unistd/sysconf feature reporting
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[_SC_V7_LPBIG_OFFBIG] = -1,
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
[_SC_SS_REPL_MAX] = -1,
[_SC_TRACE_EVENT_NAME_MAX] = -1,
[_SC_TRACE_NAME_MAX] = -1,
[_SC_TRACE_SYS_MAX] = -1,
[_SC_TRACE_USER_EVENT_MAX] = -1,
[_SC_XOPEN_STREAMS] = 0,
[_SC_THREAD_ROBUST_PRIO_INHERIT] = -1,
[_SC_THREAD_ROBUST_PRIO_PROTECT] = -1,
};
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
2014-04-15 13:30:20 -04:00
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
if (name > sizeof(values)/sizeof(values[0])) {
errno = EINVAL;
return -1;
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
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} else if (values[name] >= -1) {
return values[name];
} else if (values[name] < -256) {
in sysconf, use getrlimit function rather than raw syscall for rlimits the syscall is deprecated (replaced by prlimit64) and does not work correctly on x32. this change mildly increases size, but is likely needed anyway for newer archs that might omit deprecated syscalls.
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struct rlimit lim;
getrlimit(values[name]&16383, &lim);
return lim.rlim_cur > LONG_MAX ? LONG_MAX : lim.rlim_cur;
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
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}
switch ((unsigned char)values[name]) {
case VER & 255:
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
return _POSIX_VERSION;
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
2014-04-15 13:30:20 -04:00
case JT_ARG_MAX & 255:
return ARG_MAX;
case JT_MQ_PRIO_MAX & 255:
return MQ_PRIO_MAX;
case JT_PAGE_SIZE & 255:
support configurable page size on mips, powerpc and microblaze PAGE_SIZE was hardcoded to 4096, which is historically what most systems use, but on several archs it is a kernel config parameter, user space can only know it at execution time from the aux vector. PAGE_SIZE and PAGESIZE are not defined on archs where page size is a runtime parameter, applications should use sysconf(_SC_PAGE_SIZE) to query it. Internally libc code defines PAGE_SIZE to libc.page_size, which is set to aux[AT_PAGESZ] in __init_libc and early in __dynlink as well. (Note that libc.page_size can be accessed without GOT, ie. before relocations are done) Some fpathconf settings are hardcoded to 4096, these should be actually queried from the filesystem using statfs.
2013-09-15 02:00:32 +00:00
return PAGE_SIZE;
avoid linear-time if/else special cases in sysconf the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
2014-04-15 13:30:20 -04:00
case JT_SEM_VALUE_MAX & 255:
return SEM_VALUE_MAX;
case JT_NPROCESSORS_CONF & 255:
case JT_NPROCESSORS_ONLN & 255: ;
let sysconf accurately report # of cpus available i've been trying out openmp and it seems like it won't be much use without this...
2012-05-13 00:44:35 -04:00
unsigned char set[128] = {1};
int i, cnt;
__syscall(SYS_sched_getaffinity, 0, sizeof set, set);
for (i=cnt=0; i<sizeof set; i++)
for (; set[i]; set[i]&=set[i]-1, cnt++);
return cnt;
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
}
fix sem_open and sem_close to obey posix semantics multiple opens of the same named semaphore must return the same pointer, and only the last close can unmap it. thus the ugly global state keeping track of mappings. the maximum number of distinct named semaphores that can be opened is limited sufficiently small that the linear searches take trivial time, especially compared to the syscall overhead of these functions.
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return values[name];
initial check-in, version 0.5.0
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}
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