| /* Copyright (C) 2002-2018 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) |
