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Annotation of OpenXM/src/ox_pari/mysig.c, Revision 1.2

1.2     ! noro        1: /* $OpenXM: OpenXM/src/ox_pari/mysig.c,v 1.1 2018/06/04 06:28:05 ohara Exp $
1.1       ohara       2:  */
                      3: #include <stdio.h>
                      4: #include <signal.h>
                      5: #include <unistd.h>
                      6: #include <setjmp.h>
                      7: #include <string.h>
                      8: #include "mysig.h"
                      9:
                     10: static void *Old_handler;
                     11: /*
                     12:   sigset SIGINT, SIGCHLD, SIGUSR1
                     13:  */
                     14: int unblock_signal(int sigset[]) {
                     15:   sigset_t set;
                     16:   sigset_t oldset;
                     17:   int i;
                     18:   sigemptyset(&set);
                     19:   for (i=0; sigset[i] > 0; i++) sigaddset(&set,sigset[i]);
                     20:   sigprocmask(SIG_UNBLOCK,&set,&oldset);
                     21:   return(0);
                     22: }
                     23: /* Add (or) blocked signals, see sigprocmask */
                     24: int block_signal(int sigset[]) {
                     25:   sigset_t set;
                     26:   sigset_t oldset;
                     27:   int i;
                     28:   sigemptyset(&set);
                     29:   for (i=0; sigset[i] > 0; i++) sigaddset(&set,sigset[i]);
                     30:   sigprocmask(SIG_BLOCK,&set,&oldset);
                     31:   return(0);
                     32: }
                     33:
                     34: #if !defined(SA_RESTART) && defined(__FreeBSD__)
                     35: #define SA_RESTART  0x0002
                     36: #endif
                     37:
                     38: int set_signal(int sig,void (*handler)(int m)) {
                     39:   struct sigaction act;
                     40:   struct sigaction oldact;
                     41:   int val;
                     42:   act.sa_handler=handler;
                     43:   act.sa_flags=0;
                     44:   act.sa_flags |= SA_RESTART;
                     45:   sigemptyset(&act.sa_mask);
                     46:   val=sigaction(sig,&act,&oldact);
                     47:   Old_handler = oldact.sa_handler;
                     48:   return(val);
                     49: }
                     50: /*
                     51:   my own emulation of signal for portability.
                     52:  */
                     53: void *mysignal(int sig,void (*handler)(int m)) {
                     54:   int sigset[2];
                     55:   if (handler == SIG_IGN) {
                     56:     /*    sigset[0] = sig; sigset[1]=0;
                     57:     block_signal(sigset);
                     58:     return(SIG_IGN);*/
                     59:     return(signal(sig,handler));
                     60:   }else if (handler == SIG_DFL) {
                     61:     return(signal(sig,handler));
                     62:   }
                     63:   /* on unix system, you may simply call signal(3) here.  */
                     64:   set_signal(sig,handler);
                     65:   /* unblock is necessary on cygwin, ..., cf. misc-2015/12/misc */
                     66:   sigset[0] = sig; sigset[1]=0; unblock_signal(sigset);
                     67:   return((void *)Old_handler);
                     68: }
                     69: