81 lines
1.3 KiB
C
81 lines
1.3 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "system.h"
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#include "wait.h"
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#include <stdio.h>
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struct unreaped {
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pid_t pid;
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int status;
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};
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static struct unreaped *unreaped;
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static int n;
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static struct unreaped *ualloc (oldptr, n)
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struct unreaped *oldptr;
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int n;
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{
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n *= sizeof (struct unreaped);
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if (n == 0)
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n = 1;
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if (oldptr)
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oldptr = (struct unreaped *) realloc ((char *) oldptr, n);
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else
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oldptr = (struct unreaped *) malloc (n);
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if (oldptr == 0)
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{
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fprintf (stderr, "cannot allocate %d bytes\n", n);
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exit (1);
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}
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return oldptr;
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}
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pid_t waitpid (pid, status, options)
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pid_t pid;
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int *status;
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int options;
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{
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int i;
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/* initialize */
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if (unreaped == 0)
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{
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unreaped = ualloc (unreaped, 1);
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unreaped[0].pid = 0;
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n = 1;
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}
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for (i = 0; unreaped[i].pid; i++)
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if (unreaped[i].pid == pid)
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{
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*status = unreaped[i].status;
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while (unreaped[i].pid)
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{
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unreaped[i] = unreaped[i+1];
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i++;
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}
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n--;
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return pid;
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}
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while (1)
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{
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#ifdef HAVE_WAIT3
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pid_t p = wait3 (status, options, (struct rusage *) 0);
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#else
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pid_t p = wait (status);
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#endif
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if (p == 0 || p == -1 || p == pid)
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return p;
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n++;
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unreaped = ualloc (unreaped, n);
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unreaped[n-1].pid = p;
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unreaped[n-1].status = *status;
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}
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}
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