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52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/* Send a signal to a specific pthread. Stub version.
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Copyright (C) 2014-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <pthreadP.h>
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#include <shlib-compat.h>
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int
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__pthread_kill (pthread_t threadid, int signo)
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{
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/* Disallow sending the signal we use for cancellation, timers,
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for the setxid implementation. */
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if (__is_internal_signal (signo))
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return EINVAL;
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/* Force load of pd->tid into local variable or register. Otherwise
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if a thread exits between ESRCH test and tgkill, we might return
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EINVAL, because pd->tid would be cleared by the kernel. */
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struct pthread *pd = (struct pthread *) threadid;
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pid_t tid = atomic_forced_read (pd->tid);
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if (__glibc_unlikely (tid <= 0))
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/* Not a valid thread handle. */
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return ESRCH;
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/* We have a special syscall to do the work. */
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pid_t pid = __getpid ();
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int val = INTERNAL_SYSCALL_CALL (tgkill, pid, tid, signo);
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return (INTERNAL_SYSCALL_ERROR_P (val)
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? INTERNAL_SYSCALL_ERRNO (val) : 0);
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}
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versioned_symbol (libc, __pthread_kill, pthread_kill, GLIBC_2_34);
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#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_34)
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compat_symbol (libc, __pthread_kill, pthread_kill, GLIBC_2_0);
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#endif
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