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