Mercurial > hg > octave-kai > gnulib-hg
annotate lib/sigprocmask.c @ 9084:2932e92d6e31
* lib/version-etc.c (version_etc_va): Default to GPLv3+.
* NEWS: Document this change.
| author | Eric Blake <ebb9@byu.net> |
|---|---|
| date | Tue, 10 Jul 2007 12:22:36 +0000 |
| parents | bb4e89fdfa87 |
| children | bbbbbf4cd1c5 |
| rev | line source |
|---|---|
| 7503 | 1 /* POSIX compatible signal blocking. |
|
8783
bb4e89fdfa87
sigprocmask.h is replaced with <signal.h>.
Bruno Haible <bruno@clisp.org>
parents:
7517
diff
changeset
|
2 Copyright (C) 2006-2007 Free Software Foundation, Inc. |
| 7503 | 3 Written by Bruno Haible <bruno@clisp.org>, 2006. |
| 4 | |
| 5 This program is free software; you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 2, or (at your option) | |
| 8 any later version. | |
| 9 | |
| 10 This program 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 | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software Foundation, | |
| 17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 18 | |
| 19 #include <config.h> | |
| 20 | |
| 21 /* Specification. */ | |
|
8783
bb4e89fdfa87
sigprocmask.h is replaced with <signal.h>.
Bruno Haible <bruno@clisp.org>
parents:
7517
diff
changeset
|
22 #include <signal.h> |
| 7503 | 23 |
| 24 #include <errno.h> | |
| 25 #include <stdint.h> | |
| 26 #include <stdlib.h> | |
| 27 | |
| 28 /* We assume that a platform without POSIX signal blocking functions also | |
| 29 does not have the POSIX sigaction() function, only the signal() function. | |
| 30 This is true for Woe32 platforms. */ | |
| 31 | |
| 32 /* A signal handler. */ | |
| 33 typedef void (*handler_t) (int signal); | |
| 34 | |
| 35 int | |
| 36 sigismember (const sigset_t *set, int sig) | |
| 37 { | |
| 38 if (sig >= 0 && sig < NSIG) | |
| 39 return (*set >> sig) & 1; | |
| 40 else | |
| 41 return 0; | |
| 42 } | |
| 43 | |
| 44 int | |
| 45 sigemptyset (sigset_t *set) | |
| 46 { | |
| 47 *set = 0; | |
| 48 return 0; | |
| 49 } | |
| 50 | |
| 51 int | |
| 52 sigaddset (sigset_t *set, int sig) | |
| 53 { | |
| 54 if (sig >= 0 && sig < NSIG) | |
| 55 { | |
| 56 *set |= 1U << sig; | |
| 57 return 0; | |
| 58 } | |
| 59 else | |
| 60 { | |
| 61 errno = EINVAL; | |
| 62 return -1; | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 int | |
| 67 sigdelset (sigset_t *set, int sig) | |
| 68 { | |
| 69 if (sig >= 0 && sig < NSIG) | |
| 70 { | |
| 71 *set &= ~(1U << sig); | |
| 72 return 0; | |
| 73 } | |
| 74 else | |
| 75 { | |
| 76 errno = EINVAL; | |
| 77 return -1; | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 int | |
| 82 sigfillset (sigset_t *set) | |
| 83 { | |
| 84 *set = (2U << (NSIG - 1)) - 1; | |
| 85 return 0; | |
| 86 } | |
| 87 | |
| 88 /* Set of currently blocked signals. */ | |
| 89 static sigset_t blocked_set /* = 0 */; | |
| 90 | |
| 91 /* Set of currently blocked and pending signals. */ | |
| 92 static volatile sig_atomic_t pending_array[NSIG] /* = { 0 } */; | |
| 93 | |
| 94 /* Signal handler that is installed for blocked signals. */ | |
| 95 static void | |
| 96 blocked_handler (int sig) | |
| 97 { | |
| 98 if (sig >= 0 && sig < NSIG) | |
| 99 pending_array[sig] = 1; | |
| 100 } | |
| 101 | |
| 102 int | |
| 103 sigpending (sigset_t *set) | |
| 104 { | |
| 105 sigset_t pending = 0; | |
| 106 int sig; | |
| 107 | |
| 108 for (sig = 0; sig < NSIG; sig++) | |
| 109 if (pending_array[sig]) | |
| 110 pending |= 1U << sig; | |
| 111 return pending; | |
| 112 } | |
| 113 | |
| 114 /* The previous signal handlers. | |
| 115 Only the array elements corresponding to blocked signals are relevant. */ | |
| 116 static handler_t old_handlers[NSIG]; | |
| 117 | |
| 118 int | |
| 119 sigprocmask (int operation, const sigset_t *set, sigset_t *old_set) | |
| 120 { | |
| 121 if (old_set != NULL) | |
| 122 *old_set = blocked_set; | |
| 123 | |
| 124 if (set != NULL) | |
| 125 { | |
| 126 sigset_t new_blocked_set; | |
| 127 sigset_t to_unblock; | |
| 128 sigset_t to_block; | |
| 129 | |
| 130 switch (operation) | |
| 131 { | |
| 132 case SIG_BLOCK: | |
| 133 new_blocked_set = blocked_set | *set; | |
| 134 break; | |
| 135 case SIG_SETMASK: | |
| 136 new_blocked_set = *set; | |
| 137 break; | |
| 138 case SIG_UNBLOCK: | |
| 139 new_blocked_set = blocked_set & ~*set; | |
| 140 break; | |
| 141 default: | |
| 142 errno = EINVAL; | |
| 143 return -1; | |
| 144 } | |
| 145 to_unblock = blocked_set & ~new_blocked_set; | |
| 146 to_block = new_blocked_set & ~blocked_set; | |
| 147 | |
| 148 if (to_block != 0) | |
| 149 { | |
| 150 int sig; | |
| 151 | |
| 152 for (sig = 0; sig < NSIG; sig++) | |
| 153 if ((to_block >> sig) & 1) | |
| 154 { | |
| 155 pending_array[sig] = 0; | |
| 156 if ((old_handlers[sig] = signal (sig, blocked_handler)) != SIG_ERR) | |
| 157 blocked_set |= 1U << sig; | |
| 158 } | |
| 159 } | |
| 160 | |
| 161 if (to_unblock != 0) | |
| 162 { | |
| 163 sig_atomic_t received[NSIG]; | |
| 164 int sig; | |
| 165 | |
| 166 for (sig = 0; sig < NSIG; sig++) | |
| 167 if ((to_unblock >> sig) & 1) | |
| 168 { | |
| 169 if (signal (sig, old_handlers[sig]) != blocked_handler) | |
| 170 /* The application changed a signal handler while the signal | |
| 171 was blocked. We don't support this. */ | |
| 172 abort (); | |
| 173 received[sig] = pending_array[sig]; | |
| 174 blocked_set &= ~(1U << sig); | |
| 175 pending_array[sig] = 0; | |
| 176 } | |
| 177 else | |
| 178 received[sig] = 0; | |
| 179 | |
| 180 for (sig = 0; sig < NSIG; sig++) | |
|
7517
55b0b8000058
* lib/sigprocmask.c (sigprocmask): Fix typo.
Eric Blake <ebb9@byu.net>
parents:
7503
diff
changeset
|
181 if (received[sig]) |
| 7503 | 182 { |
| 183 #if HAVE_RAISE | |
| 184 raise (sig); | |
| 185 #else | |
| 186 kill (getpid (), sig); | |
| 187 #endif | |
| 188 } | |
| 189 } | |
| 190 } | |
| 191 return 0; | |
| 192 } |