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
  57 #include <sys/param.h>
  58 #include <signal.h>
  59 #include <errno.h>
  60 #if defined(__DYNAMIC__)
  61 extern int _sigaction_nobind (int sig, const struct sigaction *nsv, struct sigaction *osv);
  62 #endif
  63
  64 static int
  65 sigvec__(signo, sv, osv, bind)
  66         int signo;
  67         struct sigvec *sv, *osv;
  68         int bind;
  69 {
  70         int ret;
  71
  72         if (sv)
  73                 sv->sv_flags ^= SV_INTERRUPT;   /* !SA_INTERRUPT */
  74 #if defined(__DYNAMIC__)
  75         if (bind) {
  76 #endif
  77             ret = sigaction(signo, (struct sigaction *)sv, (struct sigaction *)osv);
  78 #if defined(__DYNAMIC__)
  79         } else {
  80             ret = _sigaction_nobind(signo, (struct sigaction *)sv, (struct sigaction *)osv);
  81         }
  82 #endif
  83         if (ret == 0 && osv)
  84                 osv->sv_flags ^= SV_INTERRUPT;  /* !SA_INTERRUPT */
  85         return (ret);
  86 }
  87
  88 int
  89 sigvec(signo, sv, osv)
  90         int signo;
  91         struct sigvec *sv, *osv;
  92 {
  93     return sigvec__(signo, sv, osv, 1);
  94 }
  95
  96 #if defined(__DYNAMIC__)
  97 int
  98 _sigvec_nobind(signo, sv, osv)
  99         int signo;
 100         struct sigvec *sv, *osv;
 101 {
 102     return sigvec__(signo, sv, osv, 0);
 103 }
 104 #endif
 105
 106 int
 107 sigsetmask(mask)
 108         int mask;
 109 {
 110         int omask, n;
 111
 112         n = sigprocmask(SIG_SETMASK, (sigset_t *) &mask, (sigset_t *) &omask);
 113         if (n)
 114                 return (n);
 115         return (omask);
 116 }
 117
 118 int
 119 sigblock(mask)
 120         int mask;
 121 {
 122         int omask, n;
 123
 124         n = sigprocmask(SIG_BLOCK, (sigset_t *) &mask, (sigset_t *) &omask);
 125         if (n)
 126                 return (n);
 127         return (omask);
 128 }
 129
 130 int
 131 sigpause(mask)
 132         int mask;
 133 {
 134         return (sigsuspend((sigset_t *)&mask));
 135 }
 136
 137 int
 138 sighold(sig)
 139         int sig;
 140 {
 141         sigset_t mask;
 142
 143         if ((sig <= 0) || (sig >= NSIG)) {
 144                 errno = EINVAL;
 145                 return(-1);
 146         }
 147         sigemptyset(&mask);
 148         sigaddset(&mask, sig);
 149         return(sigprocmask(SIG_BLOCK, &mask,(sigset_t *)0));
 150 }
 151
 152 int
 153 sigrelse(sig)
 154         int sig;
 155 {
 156         sigset_t mask;
 157
 158         if ((sig <= 0) || (sig >= NSIG)) {
 159                 errno = EINVAL;
 160                 return(-1);
 161         }
 162         sigemptyset(&mask);
 163         sigaddset(&mask, sig);
 164         return(sigprocmask(SIG_UNBLOCK, &mask,(sigset_t *)0));
 165 }
 166
 167
 168 int
 169 sigignore(sig)
 170         int sig;
 171 {
 172         return (signal(sig, SIG_IGN) == SIG_ERR ? -1 : 0);
 173 }
 174
 175 void (*sigset(int sig, void (*disp)(int)))(int) {
 176         sigset_t omask;
 177         int blocked;
 178         struct sigaction oact;
 179
 180         if ((sig <= 0) || (sig >= NSIG)) {
 181                 errno = EINVAL;
 182                 return (SIG_ERR);
 183         }
 184         if (-1 == sigprocmask(0, NULL, &omask))
 185                 return (SIG_ERR);
 186         blocked = sigismember(&omask, sig);
 187         if (disp == SIG_HOLD) {
 188                 if (blocked)
 189                         return (SIG_HOLD);
 190                 if ((-1 == sigaction(sig, NULL, &oact)) ||
 191                     (-1 == sighold(sig)))
 192                         return (SIG_ERR);
 193                 return (sig_t)oact.sa_handler;
 194         } else {
 195                 if (blocked) {
 196                         if (-1 == sigrelse(sig))
 197                                 return (SIG_ERR);
 198                 }
 199                 sig_t rv = signal(sig, disp);
 200                 if (rv != SIG_ERR)
 201                         return blocked ? SIG_HOLD : rv;
 202                 else
 203                         return (rv);
 204         }
 205 }