| 1 | #include <stdio.h> |
|---|---|
| 2 | #include <stdlib.h> |
| 3 | #include <unistd.h> |
| 4 | #include <error.h> |
| 5 | #include <errno.h> |
| 6 | #include <sys/wait.h> |
| 7 | |
| 8 | void __attribute_noinline__ noop (void); |
| 9 | |
| 10 | #define NR 2 /* Exit code of the child. */ |
| 11 | |
| 12 | int |
| 13 | main (void) |
| 14 | { |
| 15 | pid_t pid; |
| 16 | int status; |
| 17 | |
| 18 | printf (format: "Before vfork\n"); |
| 19 | fflush (stdout); |
| 20 | pid = vfork (); |
| 21 | if (pid == 0) |
| 22 | { |
| 23 | /* This will clobber the return pc from vfork in the parent on |
| 24 | machines where it is stored on the stack, if vfork wasn't |
| 25 | implemented correctly, */ |
| 26 | noop (); |
| 27 | _exit (NR); |
| 28 | } |
| 29 | else if (pid < 0) |
| 30 | error (status: 1, errno, format: "vfork"); |
| 31 | printf (format: "After vfork (parent)\n"); |
| 32 | if (waitpid (pid: 0, stat_loc: &status, options: 0) != pid |
| 33 | || !WIFEXITED (status) || WEXITSTATUS (status) != NR) |
| 34 | exit (1); |
| 35 | |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | void |
| 40 | noop (void) |
| 41 | { |
| 42 | } |
| 43 |