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wait_pid.c (709B)

      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