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- /* Copyright (C) 2002-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #include <errno.h>
- #include <signal.h>
- #include <pthreadP.h>
- #include <tls.h>
- #include <sysdep.h>
- #include <unistd.h>
- int
- __pthread_kill (pthread_t threadid, int signo)
- {
- struct pthread *pd = (struct pthread *) threadid;
- /* Make sure the descriptor is valid. */
- if (DEBUGGING_P && INVALID_TD_P (pd))
- /* Not a valid thread handle. */
- return ESRCH;
- /* 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. */
- pid_t tid = atomic_forced_read (pd->tid);
- if (__glibc_unlikely (tid <= 0))
- /* Not a valid thread handle. */
- return ESRCH;
- /* Disallow sending the signal we use for cancellation, timers,
- for the setxid implementation. */
- if (signo == SIGCANCEL || signo == SIGTIMER || signo == SIGSETXID)
- return EINVAL;
- /* We have a special syscall to do the work. */
- INTERNAL_SYSCALL_DECL (err);
- pid_t pid = __getpid ();
- int val = INTERNAL_SYSCALL_CALL (tgkill, err, pid, tid, signo);
- return (INTERNAL_SYSCALL_ERROR_P (val, err)
- ? INTERNAL_SYSCALL_ERRNO (val, err) : 0);
- }
- strong_alias (__pthread_kill, pthread_kill)
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