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Annotation of OpenXM/src/util/mysig.c, Revision 1.1

1.1     ! takayama    1: /* $OpenXM$
        !             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:   struct sigaction act;
        !            16:   sigset_t set;
        !            17:   sigset_t oldset;
        !            18:   int i;
        !            19:   sigemptyset(&set);
        !            20:   for (i=0; sigset[i] > 0; i++) sigaddset(&set,sigset[i]);
        !            21:   sigprocmask(SIG_UNBLOCK,&set,&oldset);
        !            22:   return(0);
        !            23: }
        !            24: /* Add (or) blocked signals, see sigprocmask */
        !            25: int block_signal(int sigset[]) {
        !            26:   struct sigaction act;
        !            27:   sigset_t set;
        !            28:   sigset_t oldset;
        !            29:   int i;
        !            30:   sigemptyset(&set);
        !            31:   for (i=0; sigset[i] > 0; i++) sigaddset(&set,sigset[i]);
        !            32:   sigprocmask(SIG_BLOCK,&set,&oldset);
        !            33:   return(0);
        !            34: }
        !            35:
        !            36: int set_signal(int sig,void (*handler)(int m)) {
        !            37:   struct sigaction act;
        !            38:   struct sigaction oldact;
        !            39:   int val;
        !            40:   act.sa_handler=handler;
        !            41:   act.sa_flags=0;
        !            42:   act.sa_flags |= SA_RESTART;
        !            43:   sigemptyset(&act.sa_mask);
        !            44:   val=sigaction(sig,&act,&oldact);
        !            45:   Old_handler = oldact.sa_handler;
        !            46:   return(val);
        !            47: }
        !            48: /*
        !            49:   my own emulation of signal for portability.
        !            50:  */
        !            51: void *mysignal(int sig,void (*handler)(int m)) {
        !            52:   int sigset[2];
        !            53:   if (handler == SIG_IGN) {
        !            54:     /*    sigset[0] = sig; sigset[1]=0;
        !            55:     block_signal(sigset);
        !            56:     return(SIG_IGN);*/
        !            57:     return(signal(sig,handler));
        !            58:   }else if (handler == SIG_DFL) {
        !            59:     return(signal(sig,handler));
        !            60:   }
        !            61:   /* on unix system, you may simply call signal(3) here.  */
        !            62:   set_signal(sig,handler);
        !            63:   /* unblock is necessary on cygwin, ... */
        !            64:   sigset[0] = sig; sigset[1]=0; unblock_signal(sigset);
        !            65:   return((void *)Old_handler);
        !            66: }
        !            67:
        !            68:
        !            69:
        !            70: