1/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <signal.h>
20#include <sysdep.h>
21#include <errno.h>
22#include <sys/types.h>
23#include <unistd.h>
24#include <nptl-signals.h>
25
26int
27raise (int sig)
28{
29 /* raise is an async-safe function so it could be called while the
30 fork/vfork function temporarily invalidated the PID field. To avoid
31 relying on cached value we block all user-defined signal handler
32 (which might call fork/vfork) and issue the getpid and gettid
33 syscalls directly. */
34
35
36 /* rt_sigprocmask may fail if:
37
38 1. sigsetsize != sizeof (sigset_t) (EINVAL)
39 2. a failure in copy from/to user space (EFAULT)
40 3. an invalid 'how' operation (EINVAL)
41
42 The first case is already handle in glibc syscall call by using the arch
43 defined _NSIG. Second case is handled by using a stack allocated mask.
44 The last one should be handled by the block/unblock functions. */
45
46 sigset_t set;
47 __libc_signal_block_app (&set);
48
49 INTERNAL_SYSCALL_DECL (err);
50 pid_t pid = INTERNAL_SYSCALL (getpid, err, 0);
51 pid_t tid = INTERNAL_SYSCALL (gettid, err, 0);
52
53 int ret = INLINE_SYSCALL (tgkill, 3, pid, tid, sig);
54
55 __libc_signal_restore_set (&set);
56
57 return ret;
58}
59libc_hidden_def (raise)
60weak_alias (raise, gsignal)
61