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Member "tcsh-6.22.03/tc.sig.c" (18 Nov 2020, 3618 Bytes) of package /linux/misc/tcsh-6.22.03.tar.gz:


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    1 /*
    2  * tc.sig.c: Signal routine emulations
    3  */
    4 /*-
    5  * Copyright (c) 1980, 1991 The Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 #include "sh.h"
   33 #include "tc.wait.h"
   34 
   35 void
   36 sigset_interrupting(int sig, void (*fn) (int))
   37 {
   38     struct sigaction act;
   39 
   40     act.sa_handler = fn;
   41     sigemptyset(&act.sa_mask);
   42     act.sa_flags = 0;
   43     if (sigaction(sig, &act, NULL) == 0) {
   44     sigset_t set;
   45     sigemptyset(&set);
   46     sigaddset(&set, sig);
   47     sigprocmask(SIG_UNBLOCK, &set, NULL);
   48     }
   49 }
   50 
   51 static volatile sig_atomic_t alrmcatch_pending; /* = 0; */
   52 static volatile sig_atomic_t pchild_pending; /* = 0; */
   53 static volatile sig_atomic_t phup_pending; /* = 0; */
   54 static volatile sig_atomic_t pintr_pending; /* = 0; */
   55 int alrmcatch_disabled; /* = 0; */
   56 int phup_disabled; /* = 0; */
   57 int pchild_disabled; /* = 0; */
   58 int pintr_disabled; /* = 0; */
   59 
   60 int
   61 handle_pending_signals(void)
   62 {
   63     int rv = 0;
   64     if (!phup_disabled && phup_pending) {
   65     phup_pending = 0;
   66     handle_interrupt++;
   67     phup();
   68     handle_interrupt--;
   69     }
   70     if (!pintr_disabled && pintr_pending) {
   71     pintr_pending = 0;
   72     handle_interrupt++;
   73     pintr();
   74     handle_interrupt--;
   75     rv = 1;
   76     }
   77     if (!pchild_disabled && pchild_pending) {
   78     pchild_pending = 0;
   79     handle_interrupt++;
   80     pchild();
   81     handle_interrupt--;
   82     }
   83     if (!alrmcatch_disabled && alrmcatch_pending) {
   84     alrmcatch_pending = 0;
   85     handle_interrupt++;
   86     alrmcatch();
   87     handle_interrupt--;
   88     }
   89     return rv;
   90 }
   91 
   92 void
   93 queue_alrmcatch(int sig)
   94 {
   95     USE(sig);
   96     alrmcatch_pending = 1;
   97 }
   98 
   99 void
  100 queue_pchild(int sig)
  101 {
  102     USE(sig);
  103     pchild_pending = 1;
  104 }
  105 
  106 void
  107 queue_phup(int sig)
  108 {
  109     USE(sig);
  110     phup_pending = 1;
  111 }
  112 
  113 void
  114 queue_pintr(int sig)
  115 {
  116     USE(sig);
  117     pintr_pending = 1;
  118 }
  119 
  120 void
  121 disabled_cleanup(void *xdisabled)
  122 {
  123     int *disabled;
  124 
  125     disabled = xdisabled;
  126     if (--*disabled == 0)
  127     handle_pending_signals();
  128 }
  129 
  130 void
  131 pintr_disabled_restore(void *xold)
  132 {
  133     int *old;
  134 
  135     old = xold;
  136     pintr_disabled = *old;
  137 }
  138 
  139 void
  140 pintr_push_enable(int *saved)
  141 {
  142     *saved = pintr_disabled;
  143     pintr_disabled = 0;
  144     cleanup_push(saved, pintr_disabled_restore);
  145     handle_pending_signals();
  146 }