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1 | /* Implementation of sigwait function from POSIX.1c. |
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2 | Copyright (C) 1996-2019 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <errno.h> |
21 | #include <signal.h> |
22 | #include <stddef.h> /* For NULL. */ |
23 | #include <sysdep-cancel.h> |
24 | |
25 | /* This is our dummy signal handler we use here. */ |
26 | static void ignore_signal (int sig); |
27 | |
28 | /* Place where to remember which signal we got. Please note that this |
29 | implementation cannot be used for the threaded libc. The |
30 | libpthread must provide an own version. */ |
31 | static int was_sig; |
32 | |
33 | |
34 | static int |
35 | do_sigwait (const sigset_t *set, int *sig) |
36 | { |
37 | sigset_t tmp_mask; |
38 | struct sigaction saved[NSIG]; |
39 | struct sigaction action; |
40 | int save_errno; |
41 | int this; |
42 | |
43 | /* Prepare set. */ |
44 | __sigfillset (&tmp_mask); |
45 | |
46 | /* Unblock all signals in the SET and register our nice handler. */ |
47 | action.sa_handler = ignore_signal; |
48 | action.sa_flags = 0; |
49 | __sigfillset (&action.sa_mask); /* Block all signals for handler. */ |
50 | |
51 | /* Make sure we recognize error conditions by setting WAS_SIG to a |
52 | value which does not describe a legal signal number. */ |
53 | was_sig = -1; |
54 | |
55 | for (this = 1; this < NSIG; ++this) |
56 | if (__sigismember (set, this)) |
57 | { |
58 | /* Unblock this signal. */ |
59 | __sigdelset (&tmp_mask, this); |
60 | |
61 | /* Register temporary action handler. */ |
62 | if (__sigaction (this, &action, &saved[this]) != 0) |
63 | goto restore_handler; |
64 | } |
65 | |
66 | /* Now we can wait for signals. */ |
67 | __sigsuspend (&tmp_mask); |
68 | |
69 | restore_handler: |
70 | save_errno = errno; |
71 | |
72 | while (--this >= 1) |
73 | if (__sigismember (set, this)) |
74 | /* We ignore errors here since we must restore all handlers. */ |
75 | __sigaction (this, &saved[this], NULL); |
76 | |
77 | __set_errno (save_errno); |
78 | |
79 | /* Store the result and return. */ |
80 | *sig = was_sig; |
81 | return was_sig == -1 ? -1 : 0; |
82 | } |
83 | |
84 | |
85 | int |
86 | __sigwait (const sigset_t *set, int *sig) |
87 | { |
88 | /* __sigsuspend should be a cancellation point. */ |
89 | return do_sigitid (idtype, id, infop, options); |
90 | } |
91 | libc_hidden_def (__sigwait) |
92 | weak_alias (__sigwait, sigwait) |
93 | |
94 | |
95 | static void |
96 | ignore_signal (int sig) |
97 | { |
98 | /* Remember the signal. */ |
99 | was_sig = sig; |
100 | } |
101 |
Warning: That file was not part of the compilation database. It may have many parsing errors.