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fix raise semantics with threads.

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This commit is contained in:
Rich Felker 2011-03-09 19:42:06 -05:00
parent 91f7db2621
commit 370f78f2c8
1 changed files with 12 additions and 1 deletions
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13
src/signal/raise.c
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@ -1,7 +1,18 @@
#include <signal.h> #include <signal.h>
#include <errno.h>
#include "syscall.h" #include "syscall.h"
int raise(int sig) int raise(int sig)
{ {
return __syscall_kill(__syscall_getpid(), sig); int pid, tid, ret;
/* Getting the pid/tid pair is not atomic, and could give wrong
* result if a fork occurs in a signal handler between the two
* syscalls. Use the tgkill syscall's ESRCH semantics to detect
* this condition and retry. */
do {
tid = syscall0(__NR_gettid);
pid = syscall0(__NR_getpid);
ret = syscall3(__NR_tgkill, pid, tid, sig);
} while (ret<0 && errno == ESRCH);
return ret;
} }