diff options
Diffstat (limited to 'posix/tst-fork.c')
| -rw-r--r-- | posix/tst-fork.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/posix/tst-fork.c b/posix/tst-fork.c index 287fa5f..0bee14f 100644 --- a/posix/tst-fork.c +++ b/posix/tst-fork.c @@ -38,6 +38,7 @@ main (void) char *name; int fd; pid_t pid; + pid_t ppid; off_t off; int status; @@ -69,10 +70,24 @@ main (void) if (off == (off_t) -1 || off != strlen (testdata)) error (EXIT_FAILURE, errno, "wrong file position"); + /* Get the parent PID. */ + ppid = getpid (); + /* Now fork of the process. */ pid = fork (); if (pid == 0) { + /* One little test first: the PID must have changed. */ + if (getpid () == ppid) + error (EXIT_FAILURE, 0, "child and parent have same PID"); + + /* Test the `getppid' function. */ + pid = getppid (); + if (pid == (pid_t) -1 ? errno != ENOSYS : pid != ppid) + error (EXIT_FAILURE, 0, + "getppid returned wrong PID (%ld, should be %ld)", + (long int) pid, (long int) ppid); + /* This is the child. First get the position of the descriptor. */ off = lseek (fd, 0, SEEK_CUR); if (off == (off_t) -1 || off != strlen (testdata)) |