compat-43/sigcompat.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1989, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  */
  55
  56 #if __DARWIN_UNIX03
  57 #ifdef VARIANT_CANCELABLE
  58 #include <pthread.h>
  59 #endif /* VARIANT_CANCELABLE */
  60 extern int __unix_conforming;
  61 #endif /* __DARWIN_UNIX03 */
  62
  63 #include <sys/param.h>
  64 #include <signal.h>
  65 #include <errno.h>
  66
  67 #ifndef BUILDING_VARIANT
  68 #if defined(__DYNAMIC__)
  69 extern int _sigaction_nobind (int sig, const struct sigaction *nsv, struct sigaction *osv);
  70 extern int _sigvec_nobind (int, struct sigvec *, struct sigvec *);
  71 #endif
  72
  73 static int
  74 sigvec__(int signo,
  75          struct sigvec *sv,
  76          struct sigvec *osv,
  77          int bind)
  78 {
  79         int ret;
  80
  81         if (sv)
  82                 sv->sv_flags ^= SV_INTERRUPT;   /* !SA_INTERRUPT */
  83 #if defined(__DYNAMIC__)
  84         if (bind) {
  85 #endif
  86             ret = sigaction(signo, (struct sigaction *)sv, (struct sigaction *)osv);
  87 #if defined(__DYNAMIC__)
  88         } else {
  89             ret = _sigaction_nobind(signo, (struct sigaction *)sv, (struct sigaction *)osv);
  90         }
  91 #endif
  92         if (ret == 0 && osv)
  93                 osv->sv_flags ^= SV_INTERRUPT;  /* !SA_INTERRUPT */
  94         return (ret);
  95 }
  96
  97 int
  98 sigvec(int signo,
  99        struct sigvec *sv,
 100        struct sigvec *osv)
 101 {
 102     return sigvec__(signo, sv, osv, 1);
 103 }
 104
 105 #if defined(__DYNAMIC__)
 106 int
 107 _sigvec_nobind(int signo,
 108                struct sigvec *sv,
 109                struct sigvec *osv)
 110 {
 111     return sigvec__(signo, sv, osv, 0);
 112 }
 113 #endif
 114
 115 int
 116 sigsetmask(int mask)
 117 {
 118         int omask, n;
 119
 120         n = sigprocmask(SIG_SETMASK, (sigset_t *) &mask, (sigset_t *) &omask);
 121         if (n)
 122                 return (n);
 123         return (omask);
 124 }
 125
 126 int
 127 sigblock(int mask)
 128 {
 129         int omask, n;
 130
 131         n = sigprocmask(SIG_BLOCK, (sigset_t *) &mask, (sigset_t *) &omask);
 132         if (n)
 133                 return (n);
 134         return (omask);
 135 }
 136 #endif /* !BUILDING_VARIANT */
 137
 138 #if __DARWIN_UNIX03
 139 int
 140 sigpause(int sig)
 141 {
 142         sigset_t mask;
 143
 144         if (__unix_conforming == 0)
 145                 __unix_conforming = 1;
 146 #ifdef VARIANT_CANCELABLE
 147         pthread_testcancel();
 148 #endif /* VARIANT_CANCELABLE */
 149
 150         if ((sig <= 0) || (sig >= NSIG)) {
 151                 errno = EINVAL;
 152                 return(-1);
 153         }
 154         if (sigprocmask(SIG_BLOCK, (sigset_t *) 0, (sigset_t *) &mask) < 0) {
 155                 return(-1);
 156         }
 157         sigdelset(&mask, sig);
 158         return (sigsuspend(&mask));
 159 }
 160 #else
 161 int
 162 sigpause(int mask)
 163 {
 164         return (sigsuspend((sigset_t *)&mask));
 165 }
 166 #endif /* __DARWIN_UNIX03 */
 167
 168 #ifndef BUILDING_VARIANT
 169 int
 170 sighold(int sig)
 171 {
 172         sigset_t mask;
 173
 174         if ((sig <= 0) || (sig >= NSIG)) {
 175                 errno = EINVAL;
 176                 return(-1);
 177         }
 178         sigemptyset(&mask);
 179         sigaddset(&mask, sig);
 180         return(sigprocmask(SIG_BLOCK, &mask,(sigset_t *)0));
 181 }
 182
 183 int
 184 sigrelse(int sig)
 185 {
 186         sigset_t mask;
 187
 188         if ((sig <= 0) || (sig >= NSIG)) {
 189                 errno = EINVAL;
 190                 return(-1);
 191         }
 192         sigemptyset(&mask);
 193         sigaddset(&mask, sig);
 194         return(sigprocmask(SIG_UNBLOCK, &mask,(sigset_t *)0));
 195 }
 196
 197
 198 int
 199 sigignore(int sig)
 200 {
 201         return (signal(sig, SIG_IGN) == SIG_ERR ? -1 : 0);
 202 }
 203
 204 void (*sigset(int sig, void (*disp)(int)))(int) {
 205         sigset_t omask;
 206         int blocked;
 207         struct sigaction oact;
 208
 209         if ((sig <= 0) || (sig >= NSIG)) {
 210                 errno = EINVAL;
 211                 return (SIG_ERR);
 212         }
 213         if (-1 == sigprocmask(0, NULL, &omask))
 214                 return (SIG_ERR);
 215         blocked = sigismember(&omask, sig);
 216         if (disp == SIG_HOLD) {
 217                 if (blocked)
 218                         return (SIG_HOLD);
 219                 if ((-1 == sigaction(sig, NULL, &oact)) ||
 220                     (-1 == sighold(sig)))
 221                         return (SIG_ERR);
 222                 return (sig_t)oact.sa_handler;
 223         } else {
 224                 if (blocked) {
 225                         if (-1 == sigrelse(sig))
 226                                 return (SIG_ERR);
 227                 }
 228                 sig_t rv = signal(sig, disp);
 229                 if (rv != SIG_ERR)
 230                         return blocked ? SIG_HOLD : rv;
 231                 else
 232                         return (rv);
 233         }
 234 }
 235 #endif /* !BUILDING_VARIANT */