| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #define sigpause __rename_sigpause |
| 19 | #include <errno.h> |
| 20 | #include <signal.h> |
| 21 | #include <stddef.h> /* For NULL. */ |
| 22 | #include <sysdep-cancel.h> |
| 23 | #undef sigpause |
| 24 | |
| 25 | #include <sigset-cvt-mask.h> |
| 26 | |
| 27 | /* Set the mask of blocked signals to MASK, |
| 28 | wait for a signal to arrive, and then restore the mask. */ |
| 29 | static int |
| 30 | do_sigpause (int sig_or_mask, int is_sig) |
| 31 | { |
| 32 | sigset_t set; |
| 33 | |
| 34 | if (is_sig != 0) |
| 35 | { |
| 36 | /* The modern X/Open implementation is requested. */ |
| 37 | if (__sigprocmask (0, NULL, &set) < 0 |
| 38 | || sigdelset (&set, sig_or_mask) < 0) |
| 39 | return -1; |
| 40 | } |
| 41 | else if (sigset_set_old_mask (&set, sig_or_mask) < 0) |
| 42 | return -1; |
| 43 | |
| 44 | /* Note the sigpause() is a cancellation point. But since we call |
| 45 | sigsuspend() which itself is a cancellation point we do not have |
| 46 | to do anything here. */ |
| 47 | return __sigsuspend (&set); |
| 48 | } |
| 49 | |
| 50 | int |
| 51 | __sigpause (int sig_or_mask, int is_sig) |
| 52 | { |
| 53 | if (SINGLE_THREAD_P) |
| 54 | return do_sigpause (sig_or_mask, is_sig); |
| 55 | |
| 56 | int oldtype = LIBC_CANCEL_ASYNC (); |
| 57 | |
| 58 | int result = do_sigpause (sig_or_mask, is_sig); |
| 59 | |
| 60 | LIBC_CANCEL_RESET (oldtype); |
| 61 | |
| 62 | return result; |
| 63 | } |
| 64 | libc_hidden_def (__sigpause) |
| 65 | |
| 66 | /* We have to provide a default version of this function since the |
| 67 | standards demand it. The version which is a bit more reasonable is |
| 68 | the BSD version. So make this the default. */ |
| 69 | int |
| 70 | __attribute__ ((weak)) |
| 71 | __default_sigpause (int mask) |
| 72 | { |
| 73 | return __sigpause (mask, 0); |
| 74 | } |
| 75 | #undef sigpause |
| 76 | weak_alias (__default_sigpause, sigpause) |
| 77 | strong_alias (__default_sigpause, __libc_sigpause) |
| 78 | |
| 79 | |
| 80 | /* We have to provide a default version of this function since the |
| 81 | standards demand it. The version which is a bit more reasonable is |
| 82 | the BSD version. So make this the default. */ |
| 83 | int |
| 84 | __attribute__ ((weak)) |
| 85 | __xpg_sigpause (int sig) |
| 86 | { |
| 87 | return __sigpause (sig, 1); |
| 88 | } |
| 89 | strong_alias (__xpg_sigpause, __libc___xpg_sigpause) |