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glibc/posix/test-vfork.c
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <error.h> | |
#include <errno.h> | |
#include <sys/wait.h> | |
void __attribute_noinline__ 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); | |
return 0; | |
} | |
void | |
noop (void) | |
{ | |
} |