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1 | /* Copyright (C) 1991,92,94-98,2000,2002,2003,2004 | |
2 | Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
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 | #define sigpause __rename_sigpause | |
20 | #include <errno.h> | |
21 | #include <signal.h> | |
22 | #include <stddef.h> /* For NULL. */ | |
23 | #include <sysdep-cancel.h> | |
24 | #undef sigpause | |
25 | ||
26 | #include <sigset-cvt-mask.h> | |
27 | ||
28 | /* Set the mask of blocked signals to MASK, | |
29 | wait for a signal to arrive, and then restore the mask. */ | |
30 | static int | |
31 | do_sigpause (int sig_or_mask, int is_sig) | |
32 | { | |
33 | sigset_t set; | |
34 | ||
35 | if (is_sig != 0) | |
36 | { | |
37 | /* The modern X/Open implementation is requested. */ | |
38 | if (__sigprocmask (0, NULL, &set) < 0 | |
39 | || sigdelset (&set, sig_or_mask) < 0) | |
40 | return -1; | |
41 | } | |
42 | else if (sigset_set_old_mask (&set, sig_or_mask) < 0) | |
43 | return -1; | |
44 | ||
45 | /* Note the sigpause() is a cancellation point. But since we call | |
46 | sigsuspend() which itself is a cancellation point we do not have | |
47 | to do anything here. */ | |
48 | return __sigsuspend (&set); | |
49 | } | |
50 | ||
51 | int | |
52 | __sigpause (int sig_or_mask, int is_sig) | |
53 | { | |
54 | if (SINGLE_THREAD_P) | |
55 | return do_sigpause (sig_or_mask, is_sig); | |
56 | ||
57 | int oldtype = LIBC_CANCEL_ASYNC (); | |
58 | ||
59 | int result = do_sigpause (sig_or_mask, is_sig); | |
60 | ||
61 | LIBC_CANCEL_RESET (oldtype); | |
62 | ||
63 | return result; | |
64 | } | |
65 | libc_hidden_def (__sigpause) | |
66 | ||
67 | /* We have to provide a default version of this function since the | |
68 | standards demand it. The version which is a bit more reasonable is | |
69 | the BSD version. So make this the default. */ | |
70 | int | |
71 | __attribute__ ((weak)) | |
72 | __default_sigpause (int mask) | |
73 | { | |
74 | return __sigpause (mask, 0); | |
75 | } | |
76 | #undef sigpause | |
77 | weak_alias (__default_sigpause, sigpause) | |
78 | strong_alias (__default_sigpause, __libc_sigpause) | |
79 | ||
80 | ||
81 | /* We have to provide a default version of this function since the | |
82 | standards demand it. The version which is a bit more reasonable is | |
83 | the BSD version. So make this the default. */ | |
84 | int | |
85 | __attribute__ ((weak)) | |
86 | __xpg_sigpause (int sig) | |
87 | { | |
88 | return __sigpause (sig, 1); | |
89 | } | |
90 | strong_alias (__xpg_sigpause, __libc___xpg_sigpause) |