From ada0b9b94e60806e854140881289dfeafc837062 Mon Sep 17 00:00:00 2001
From: Lars Ingebrigtsen <larsi@gnus.org>
Date: Sun, 16 Aug 2020 20:25:44 +0200
Subject: [PATCH] Implement list-system-processes on OpenBSD
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* src/sysdep.c: Implement list-system-processes on OpenBSD:
(bug#13881).  Based on a patch by Jérémie Courrèges-Anglas.
---
 src/sysdep.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/sysdep.c b/src/sysdep.c
index 6b54ed3b6ec..b1371cd411b 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -49,7 +49,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 # include <cygwin/fs.h>
 #endif
 
-#if defined DARWIN_OS || defined __FreeBSD__
+#if defined DARWIN_OS || defined __FreeBSD__ || defined __OpenBSD__
 # include <sys/sysctl.h>
 #endif
 
@@ -3061,37 +3061,43 @@ list_system_processes (void)
   return proclist;
 }
 
-#elif defined DARWIN_OS || defined __FreeBSD__
+#elif defined DARWIN_OS || defined __FreeBSD__ || defined __OpenBSD__
 
 Lisp_Object
 list_system_processes (void)
 {
 #ifdef DARWIN_OS
   int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
+#elif defined __OpenBSD__
+  int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0,
+    sizeof (struct kinfo_proc), 4096};
 #else
   int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_PROC};
 #endif
   size_t len;
+  size_t mibsize = sizeof mib / sizeof mib[0];
   struct kinfo_proc *procs;
   size_t i;
 
   Lisp_Object proclist = Qnil;
 
-  if (sysctl (mib, 3, NULL, &len, NULL, 0) != 0 || len == 0)
+  if (sysctl (mib, mibsize, NULL, &len, NULL, 0) != 0 || len == 0)
     return proclist;
 
   procs = xmalloc (len);
-  if (sysctl (mib, 3, procs, &len, NULL, 0) != 0 || len == 0)
+  if (sysctl (mib, mibsize, procs, &len, NULL, 0) != 0 || len == 0)
     {
       xfree (procs);
       return proclist;
     }
 
-  len /= sizeof (struct kinfo_proc);
+  len /= sizeof procs[0];
   for (i = 0; i < len; i++)
     {
 #ifdef DARWIN_OS
       proclist = Fcons (INT_TO_INTEGER (procs[i].kp_proc.p_pid), proclist);
+#elif defined __OpenBSD__
+      proclist = Fcons (INT_TO_INTEGER (procs[i].p_pid), proclist);
 #else
       proclist = Fcons (INT_TO_INTEGER (procs[i].ki_pid), proclist);
 #endif
-- 
2.39.2