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/* Send a signal to a specific pthread. Stub version.
Copyright (C) 2014-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <pthreadP.h>
#include <shlib-compat.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;
pid_t tid = atomic_forced_read (pd->tid);
if (__glibc_unlikely (tid <= 0))
/* Not a valid thread handle. */
return ESRCH;
/* 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);
}
versioned_symbol (libc, __pthread_kill, pthread_kill, GLIBC_2_34);
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_34)
compat_symbol (libc, __pthread_kill, pthread_kill, GLIBC_2_0);
#endif
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