Use /dev/fd instead of /proc/self/fd

/dev/fd exists on all operating systems I can test (Linux, FreeBSD, macOS),
whereas /proc/self/fd only appears to exist on Linux.

Signed-off-by: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>

1 files changed, 7 insertions, 3 deletions

diff --git a/tests/test-helpers.c b/tests/test-helpers.c
index 20b6690..4cdd1fc 100644
--- a/tests/test-helpers.c
+++ b/tests/test-helpers.c
@@ -48,8 +48,12 @@ count_open_fds(void)
 	struct dirent *ent;
 	int count = 0;
 
-	dir = opendir("/proc/self/fd");
-	assert(dir && "opening /proc/self/fd failed.");
+	/*
+	 * Using /dev/fd instead of /proc/self/fd should allow this code to
+	 * work on non-Linux operating systems.
+	 */
+	dir = opendir("/dev/fd");
+	assert(dir && "opening /dev/fd failed.");
 
 	errno = 0;
 	while ((ent = readdir(dir))) {
@@ -58,7 +62,7 @@ count_open_fds(void)
 			continue;
 		count++;
 	}
-	assert(errno == 0 && "reading /proc/self/fd failed.");
+	assert(errno == 0 && "reading /dev/fd failed.");
 
 	closedir(dir);