From 8a5fe8ce6bb6c2bd81f237a0f4a2583722ffbd1c Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Fri, 20 Dec 2024 21:51:24 +0000
Subject: [PATCH] Extend the code to effciently close unwanted file descriptors
 to *BSD.

---
 src/util.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/util.c b/src/util.c
index 89ee968..933340c 100644
--- a/src/util.c
+++ b/src/util.c
@@ -810,11 +810,25 @@ void close_fds(long max_fd, int spare1, int spare2, int spare3)
 {
   /* On Linux, use the /proc/ filesystem to find which files
      are actually open, rather than iterate over the whole space,
-     for efficiency reasons. If this fails we drop back to the dumb code. */
-#ifdef HAVE_LINUX_NETWORK 
+     for efficiency reasons.
+
+     On *BSD, the same facility is found at /dev/fd.
+
+     If this fails we drop back to the dumb code.
+  */
+
+#ifdef HAVE_LINUX_NETWORK
+#define FDESCFS "/proc/self/fd"
+#endif
+
+#ifdef HAVE_BSD_NETWORK
+#define FDESCFS "/dev/fd"
+#endif
+
+#ifdef FDESCFS
   DIR *d;
   
-  if ((d = opendir("/proc/self/fd")))
+  if ((d = opendir(FDESCFS)))
     {
       struct dirent *de;