4.3BSD - /usr/src/new/mh/sbr/pidwait.c

   1: /* pidwait.c - wait for child to exit */
   2: 
   3: #include "../h/mh.h"
   4: #include <signal.h>
   5: #include <stdio.h>
   6: #ifdef  BSD42
   7: #include <sys/wait.h>
   8: #endif	BSD42
   9: 
  10: 
  11: int     pidwait (id, sigsok)
  12: register int     id,
  13:          sigsok;
  14: {
  15:     register int    pid;
  16: #ifndef BSD42
  17:     int     status;
  18: #else   BSD42
  19:     union wait status;
  20: #endif	BSD42
  21:     int     (*hstat) (), (*istat) (), (*qstat) (), (*tstat) ();
  22: 
  23:     if (sigsok == NOTOK) {
  24:     hstat = signal (SIGHUP, SIG_IGN);
  25:     istat = signal (SIGINT, SIG_IGN);
  26:     qstat = signal (SIGQUIT, SIG_IGN);
  27:     tstat = signal (SIGTERM, SIG_IGN);
  28:     }
  29: 
  30:     while ((pid = wait (&status)) != NOTOK && pid != id)
  31:     continue;
  32: 
  33:     if (sigsok == NOTOK) {
  34:     (void) signal (SIGHUP, hstat);
  35:     (void) signal (SIGINT, istat);
  36:     (void) signal (SIGQUIT, qstat);
  37:     (void) signal (SIGTERM, tstat);
  38:     }
  39: 
  40: #ifndef BSD42
  41:     return (pid == NOTOK ? NOTOK : status);
  42: #else   BSD42
  43:     return (pid == NOTOK ? NOTOK : status.w_status);
  44: #endif	BSD42
  45: }

Defined functions