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glibc/sysdeps/unix/sysv/linux/pthread_kill.c
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/* Copyright (C) 2002-2016 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> | |
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); | |
/* One comment: The PID field in the TCB can temporarily be changed | |
(in fork). But this must not affect this code here. Since this | |
function would have to be called while the thread is executing | |
fork, it would have to happen in a signal handler. But this is | |
no allowed, pthread_kill is not guaranteed to be async-safe. */ | |
int val; | |
val = INTERNAL_SYSCALL (tgkill, err, 3, THREAD_GETMEM (THREAD_SELF, pid), | |
tid, signo); | |
return (INTERNAL_SYSCALL_ERROR_P (val, err) | |
? INTERNAL_SYSCALL_ERRNO (val, err) : 0); | |
} | |
strong_alias (__pthread_kill, pthread_kill) |