mdw@git.distorted.org.uk Git - qmail/blob - wait_pid.c

   1 #include <sys/types.h>
   2 #include <sys/wait.h>
   3 #include "error.h"
   4 #include "haswaitp.h"
   5
   6 #ifdef HASWAITPID
   7
   8 int wait_pid(wstat,pid) int *wstat; int pid;
   9 {
  10   int r;
  11
  12   do
  13     r = waitpid(pid,wstat,0);
  14   while ((r == -1) && (errno == error_intr));
  15   return r;
  16 }
  17
  18 #else
  19
  20 /* XXX untested */
  21 /* XXX breaks down with more than two children */
  22 static int oldpid = 0;
  23 static int oldwstat; /* defined if(oldpid) */
  24
  25 int wait_pid(wstat,pid) int *wstat; int pid;
  26 {
  27   int r;
  28
  29   if (pid == oldpid) { *wstat = oldwstat; oldpid = 0; return pid; }
  30
  31   do {
  32     r = wait(wstat);
  33     if ((r != pid) && (r != -1)) { oldwstat = *wstat; oldpid = r; continue; }
  34   }
  35   while ((r == -1) && (errno == error_intr));
  36   return r;
  37 }
  38
  39 #endif