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authorRoland McGrath <roland@hack.frob.com>2013-06-13 15:09:29 -0700
committerRoland McGrath <roland@hack.frob.com>2013-06-13 15:09:29 -0700
commita58ad3f801960fa0dc0bb1106eb0d99f7ebd77b1 (patch)
tree10616aeeaf186b442bcde2503abd50ea53b9bcca /posix/tst-waitid.c
parent5865a56bf4e31c5a152e46454367a99c5971ac02 (diff)
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Fix raciness in waitid test.
Diffstat (limited to 'posix/tst-waitid.c')
-rw-r--r--posix/tst-waitid.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/posix/tst-waitid.c b/posix/tst-waitid.c
index ad3df5a..57a6a3f 100644
--- a/posix/tst-waitid.c
+++ b/posix/tst-waitid.c
@@ -145,7 +145,7 @@ do_test (int argc, char *argv[])
/* Give the child a chance to stop. */
sleep (3);
- CHECK_SIGCHLD ("stopped", CLD_STOPPED, SIGSTOP);
+ CHECK_SIGCHLD ("stopped (before waitid)", CLD_STOPPED, SIGSTOP);
/* Now try a wait that should not succeed. */
siginfo_t info;
@@ -227,7 +227,7 @@ do_test (int argc, char *argv[])
expecting_sigchld = 0;
}
else
- CHECK_SIGCHLD ("continued", CLD_CONTINUED, SIGCONT);
+ CHECK_SIGCHLD ("continued (before waitid)", CLD_CONTINUED, SIGCONT);
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
info.si_pid = -1;
@@ -336,6 +336,13 @@ do_test (int argc, char *argv[])
printf ("kill (%d, SIGSTOP): %m\n", pid);
RETURN (EXIT_FAILURE);
}
+
+ /* Give the child a chance to stop. The waitpid call below will block
+ until it has stopped, but if we are real quick and enter the waitpid
+ system call before the SIGCHLD has been generated, then it will be
+ discarded and never delivered. */
+ sleep (3);
+
pid_t wpid = waitpid (pid, &fail, WUNTRACED);
if (wpid < 0)
{
@@ -354,7 +361,7 @@ do_test (int argc, char *argv[])
printf ("waitpid WUNTRACED on stopped: status %x\n", fail);
RETURN (EXIT_FAILURE);
}
- CHECK_SIGCHLD ("stopped", CLD_STOPPED, SIGSTOP);
+ CHECK_SIGCHLD ("stopped (after waitpid)", CLD_STOPPED, SIGSTOP);
expecting_sigchld = 1;
if (kill (pid, SIGCONT) != 0)
@@ -372,7 +379,7 @@ do_test (int argc, char *argv[])
expecting_sigchld = 0;
}
else
- CHECK_SIGCHLD ("continued", CLD_CONTINUED, SIGCONT);
+ CHECK_SIGCHLD ("continued (before waitpid)", CLD_CONTINUED, SIGCONT);
wpid = waitpid (pid, &fail, WCONTINUED);
if (wpid < 0)