[Devel] [PATCH 1/1] tests: add simple forker test

[Serge E. Hallyn]

Another braindead but useful test.  The point here is to start
testing cryo on multiple tasks.

If you run
	./tests/fork 0
then restart works fine.  If you run
	./tests/fork 1 # (or anything greater than 1)
then there is a segfault on restart.  It looks a lot like the
problem which Benjamin solved by re-enabling the NPTL code, but
I haven't quite tracked it down yet.

-serge

>From 8dd009389ada5106ad8c5d8b6e565ec75f13177a Mon Sep 17 00:00:00 2001
From: Serge E. Hallyn <serue at us.ibm.com>
Date: Tue, 24 Jun 2008 10:12:34 -0400
Subject: [PATCH 1/1] tests: add simple forker test

Add a test which forks atoi(argv[1]) times, then sleeps 1 min.

Signed-off-by: Serge E. Hallyn <serue at us.ibm.com>
---
 tests/Makefile |    2 +-
 tests/fork.c   |   53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 1 deletions(-)
 create mode 100644 tests/fork.c

diff --git a/tests/Makefile b/tests/Makefile
index 925b7af..f8233a2 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,4 +1,4 @@
-TARGETS = sleep mksysvipc pause_asm pipe sockudp
+TARGETS = sleep mksysvipc pause_asm pipe sockudp fork
 
 CFLAGS = -static
 
diff --git a/tests/fork.c b/tests/fork.c
new file mode 100644
index 0000000..955d475
--- /dev/null
+++ b/tests/fork.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+
+void sighandler(int sig)
+{
+	printf("%d: got signal %d\n", getpid(), sig);
+}
+
+void do_sleep(int whoami)
+{
+	int i;
+	for (i=0; i<30; i++)
+		sleep(2);
+	printf("%d: exiting\n", whoami);
+	exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+	int nt, i;
+	int *pids;
+	struct sigaction s;
+
+	if (argc<2) {
+		exit(1);
+	}
+
+	memset(&s, 0, sizeof(s));
+	s.sa_handler = sighandler;
+	sigaction(SIGUSR1, &s, NULL);
+	nt = atoi(argv[1]);
+	pids = malloc(nt);
+	if (!pids)
+		exit(2);
+	for (i=0; i<nt; i++) {
+		pids[i] = fork();
+		if (pids[i]<0) {
+			perror("fork");
+			exit(3);
+		} else if (pids[i] == 0)
+			do_sleep(i);
+		printf("forked %d\n", i);
+	}
+	for (i=0; i<30; i++)
+		sleep(2);
+	free(pids);
+	printf("main: exiting\n");
+	exit(0);
+}
-- 
1.5.4.1

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