Return to mysig.c CVS log

Up to [local] / OpenXM / src / util

Annotation of OpenXM/src/util/mysig.c, Revision 1.3

1.3     ! takayama    1: /* $OpenXM: OpenXM/src/util/mysig.c,v 1.2 2016/04/01 18:54:21 ohara Exp $
1.1       takayama    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:
1.2       ohara      36: #if !defined(SA_RESTART) && defined(__FreeBSD__)
                     37: #define SA_RESTART  0x0002
                     38: #endif
                     39:
1.1       takayama   40: int set_signal(int sig,void (*handler)(int m)) {
                     41:   struct sigaction act;
                     42:   struct sigaction oldact;
                     43:   int val;
                     44:   act.sa_handler=handler;
                     45:   act.sa_flags=0;
                     46:   act.sa_flags |= SA_RESTART;
                     47:   sigemptyset(&act.sa_mask);
                     48:   val=sigaction(sig,&act,&oldact);
                     49:   Old_handler = oldact.sa_handler;
                     50:   return(val);
                     51: }
                     52: /*
                     53:   my own emulation of signal for portability.
                     54:  */
                     55: void *mysignal(int sig,void (*handler)(int m)) {
                     56:   int sigset[2];
                     57:   if (handler == SIG_IGN) {
                     58:     /*    sigset[0] = sig; sigset[1]=0;
                     59:     block_signal(sigset);
                     60:     return(SIG_IGN);*/
                     61:     return(signal(sig,handler));
                     62:   }else if (handler == SIG_DFL) {
                     63:     return(signal(sig,handler));
                     64:   }
                     65:   /* on unix system, you may simply call signal(3) here.  */
                     66:   set_signal(sig,handler);
1.3     ! takayama   67:   /* unblock is necessary on cygwin, ..., cf. misc-2015/12/misc */
1.1       takayama   68:   sigset[0] = sig; sigset[1]=0; unblock_signal(sigset);
                     69:   return((void *)Old_handler);
                     70: }
                     71: