[PATCH] unit: skip sysctl test if sysfs is not available

Some build environments that build in a mount namespace do not mount
sysfs which makes sysctl and l_sysctl_* fail. Skip the test, if
the file does not exists.
---
 unit/test-sysctl.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/unit/test-sysctl.c b/unit/test-sysctl.c
index 820c707..3985e41 100644
--- a/unit/test-sysctl.c
+++ b/unit/test-sysctl.c
@@ -28,6 +28,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <stdio.h>
+#include <unistd.h>

 #include <ell/ell.h>

@@ -70,9 +71,18 @@ static void test_sysctl_get_set(const void *data)

 int main(int argc, char *argv[])
 {
+	int ret;
 	l_test_init(&argc, &argv);

-	l_test_add("sysctl/get_set", test_sysctl_get_set, NULL);
+	/*
+	* test is failing if /proc/sys/net/core/somaxconn does not exists
+	* this can happen when either net is not compiled, or running in a namespace
+	* where sysfs is not mounted
+	*/
+	ret = access("/proc/sys/net/core/somaxconn", F_OK);
+	if (!ret)
+		l_test_add("sysctl/get_set", test_sysctl_get_set, NULL);
+

 	return l_test_run();
 }
-- 
2.37.0 (Apple Git-136)