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79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2009.
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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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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include <pthreadP.h>
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#include <tls.h>
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#include <sysdep.h>
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int
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pthread_sigqueue (pthread_t threadid, int signo, const union sigval value)
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{
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#ifdef __NR_rt_tgsigqueueinfo
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struct pthread *pd = (struct pthread *) threadid;
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/* Make sure the descriptor is valid. */
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if (DEBUGGING_P && INVALID_TD_P (pd))
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/* Not a valid thread handle. */
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return ESRCH;
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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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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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/* Disallow sending the signal we use for cancellation, timers,
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for the setxid implementation. */
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if (signo == SIGCANCEL || signo == SIGTIMER || signo == SIGSETXID)
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return EINVAL;
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/* Set up the siginfo_t structure. */
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siginfo_t info;
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memset (&info, '\0', sizeof (siginfo_t));
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info.si_signo = signo;
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info.si_code = SI_QUEUE;
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info.si_pid = THREAD_GETMEM (THREAD_SELF, pid);
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info.si_uid = getuid ();
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info.si_value = value;
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/* We have a special syscall to do the work. */
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INTERNAL_SYSCALL_DECL (err);
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/* One comment: The PID field in the TCB can temporarily be changed
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(in fork). But this must not affect this code here. Since this
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function would have to be called while the thread is executing
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fork, it would have to happen in a signal handler. But this is
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no allowed, pthread_sigqueue is not guaranteed to be async-safe. */
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int val = INTERNAL_SYSCALL (rt_tgsigqueueinfo, err, 4,
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THREAD_GETMEM (THREAD_SELF, pid),
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tid, signo, &info);
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return (INTERNAL_SYSCALL_ERROR_P (val, err)
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? INTERNAL_SYSCALL_ERRNO (val, err) : 0);
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#else
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return ENOSYS;
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#endif
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}
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