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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <error.h>
#include <errno.h>
#include <sys/wait.h>
void noop (void);
#define NR 2 /* Exit code of the child. */
int
main (void)
{
pid_t pid;
int status;
printf ("Before vfork\n");
fflush (stdout);
pid = vfork ();
if (pid == 0)
{
/* This will clobber the return pc from vfork in the parent on
machines where it is stored on the stack, if vfork wasn't
implemented correctly, */
noop ();
_exit (NR);
}
else if (pid < 0)
error (1, errno, "vfork");
printf ("After vfork (parent)\n");
if (waitpid (0, &status, 0) != pid
|| !WIFEXITED (status) || WEXITSTATUS (status) != NR)
exit (1);
exit (0);
}
void
noop ()
{
}
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