diff options
Diffstat (limited to 'nptl/pthread_kill.c')
| -rw-r--r-- | nptl/pthread_kill.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/nptl/pthread_kill.c b/nptl/pthread_kill.c index f1fa2d303f..84b40478aa 100644 --- a/nptl/pthread_kill.c +++ b/nptl/pthread_kill.c @@ -16,23 +16,31 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#include <errno.h> -#include <signal.h> +#include <unistd.h> #include <pthreadP.h> - int __pthread_kill (pthread_t threadid, int signo) { + /* Disallow sending the signal we use for cancellation, timers, + for the setxid implementation. */ + if (__is_internal_signal (signo)) + return EINVAL; + + /* Force load of pd->tid into local variable or register. Otherwise + if a thread exits between ESRCH test and tgkill, we might return + EINVAL, because pd->tid would be cleared by the kernel. */ struct pthread *pd = (struct pthread *) threadid; - - /* Make sure the descriptor is valid. */ - if (DEBUGGING_P && INVALID_TD_P (pd)) + pid_t tid = atomic_forced_read (pd->tid); + if (__glibc_unlikely (tid <= 0)) /* Not a valid thread handle. */ return ESRCH; - return ENOSYS; + /* We have a special syscall to do the work. */ + pid_t pid = __getpid (); + + int val = INTERNAL_SYSCALL_CALL (tgkill, pid, tid, signo); + return (INTERNAL_SYSCALL_ERROR_P (val) + ? INTERNAL_SYSCALL_ERRNO (val) : 0); } strong_alias (__pthread_kill, pthread_kill) - -stub_warning (pthread_kill) |