From 9b09049c1ccfe70cfdadb1de92c0115b283f986d Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Tue, 19 Jan 2021 14:49:43 +0000
Subject: [PATCH] render: set thread name in a portable way

prctl is Linux-only but pthread_setname_np is same as PR_SET_NAME.
Solaris and FreeBSD >= 13 have pthread_setname_np similar to Linux.
DragonFly, OpenBSD, FreeBSD < 13 lack pthread_setname_np but provide
pthread_set_name_np which doesn't return a value. NetBSD requires 3
arguments for pthread_setname_np where the last one is void *.

render.c:8:10: fatal error: 'sys/prctl.h' file not found
 #include <sys/prctl.h>
          ^~~~~~~~~~~~~
render.c:1234:9: error: implicit declaration of function 'prctl' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    if (prctl(PR_SET_NAME, proc_title, 0, 0, 0) < 0)
        ^
render.c:1234:15: error: use of undeclared identifier 'PR_SET_NAME'
    if (prctl(PR_SET_NAME, proc_title, 0, 0, 0) < 0)
              ^
---
 render.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/render.c b/render.c
index ba6019a3..0828e21a 100644
--- a/render.c
+++ b/render.c
@@ -5,7 +5,13 @@
 #include <sys/ioctl.h>
 #include <sys/time.h>
 #include <sys/timerfd.h>
-#include <sys/prctl.h>
+#include <pthread.h>
+#if __has_include(<pthread_np.h>)
+#include <pthread_np.h>
+#define pthread_setname_np(thread, name) (pthread_set_name_np(thread, name), 0)
+#elif defined(__NetBSD__)
+#define pthread_setname_np(thread, name) pthread_setname_np(thread, "%s", (void *)name)
+#endif
 
 #include <wayland-cursor.h>
 #include <xdg-shell.h>
@@ -1208,7 +1214,7 @@ render_worker_thread(void *_ctx)
     char proc_title[16];
     snprintf(proc_title, sizeof(proc_title), "foot:render:%d", my_id);
 
-    if (prctl(PR_SET_NAME, proc_title, 0, 0, 0) < 0)
+    if (pthread_setname_np(pthread_self(), proc_title) < 0)
         LOG_ERRNO("render worker %d: failed to set process title", my_id);
 
     sem_t *start = &term->render.workers.start;