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 <errno.h> |
20 | #include <limits.h> |
21 | #include <signal.h> |
22 | #include <sysdep.h> |
23 | #include <nptl/pthreadP.h> |
24 | |
25 | |
26 | int |
27 | raise (int sig) |
28 | { |
29 | struct pthread *pd = THREAD_SELF; |
30 | pid_t pid = THREAD_GETMEM (pd, pid); |
31 | pid_t selftid = THREAD_GETMEM (pd, tid); |
32 | if (selftid == 0) |
33 | { |
34 | /* This system call is not supposed to fail. */ |
35 | #ifdef INTERNAL_SYSCALL |
36 | INTERNAL_SYSCALL_DECL (err); |
37 | selftid = INTERNAL_SYSCALL (gettid, err, 0); |
38 | #else |
39 | selftid = INLINE_SYSCALL (gettid, 0); |
40 | #endif |
41 | THREAD_SETMEM (pd, tid, selftid); |
42 | |
43 | /* We do not set the PID field in the TID here since we might be |
44 | called from a signal handler while the thread executes fork. */ |
45 | pid = selftid; |
46 | } |
47 | else |
48 | /* raise is an async-safe function. It could be called while the |
49 | fork/vfork function temporarily invalidated the PID field. Adjust for |
50 | that. */ |
51 | if (__glibc_unlikely (pid <= 0)) |
52 | pid = (pid & INT_MAX) == 0 ? selftid : -pid; |
53 | |
54 | return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig); |
55 | } |
56 | libc_hidden_def (raise) |
57 | weak_alias (raise, gsignal) |
58 | |