slstatus backlight: fix OpenBSD fd leak - sites - public wiki contents of suckless.org
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---
DIR commit ddcd578c225b82410e8fc1291c7e6b386499c7ab
DIR parent 58ddd53a24f0d5c6d4a5bee948c419671f9f62d7
HTML Author: c2ny <c2ny@proton.me>
Date: Fri, 3 Jul 2026 00:25:48 -0400
slstatus backlight: fix OpenBSD fd leak
Diffstat:
M tools.suckless.org/slstatus/patche… | 6 ++++++
A tools.suckless.org/slstatus/patche… | 156 +++++++++++++++++++++++++++++++
2 files changed, 162 insertions(+), 0 deletions(-)
---
DIR diff --git a/tools.suckless.org/slstatus/patches/backlight/index.md b/tools.suckless.org/slstatus/patches/backlight/index.md
@@ -19,9 +19,15 @@ Updated patch, with FreeBSD support:
* [slstatus-backlight-20240127-f68f492.diff](slstatus-backlight-20240127-f68f492.diff)
+Same patch as the above but fixes a file descriptor leak for
+OpenBSD and FreeBSD.
+
+* [slstatus-backlight-20260703-86133eb.diff](slstatus-backlight-20260703-86133eb.diff)
+
Authors
-------
* Tobias Tschinkowitz <he4d@posteo.de>
* David Demelier <markand@malikania.fr>
* drkhsh <me@drkhsh.at>
* Son Phan Trung <phantrungson17@gmail.com> (FreeBSD support)
+* c2ny <c2ny@proton.me>
DIR diff --git a/tools.suckless.org/slstatus/patches/backlight/slstatus-backlight-20260703-86133eb.diff b/tools.suckless.org/slstatus/patches/backlight/slstatus-backlight-20260703-86133eb.diff
@@ -0,0 +1,156 @@
+From 86133eb0523849ab11b2802abd5715ee2517668b Mon Sep 17 00:00:00 2001
+From: c2ny <c2ny@proton.me>
+Date: Fri, 3 Jul 2026 00:14:09 -0400
+Subject: [PATCH] Add backlight component
+
+This is an update to the patch that adds BSD support.
+This fixes the fd leak on OpenBSD and FreeBSD.
+---
+ Makefile | 1 +
+ components/backlight.c | 93 ++++++++++++++++++++++++++++++++++++++++++
+ config.def.h | 3 ++
+ slstatus.h | 3 ++
+ 4 files changed, 100 insertions(+)
+ create mode 100644 components/backlight.c
+
+diff --git a/Makefile b/Makefile
+index 7a18274..a7eacfa 100644
+--- a/Makefile
++++ b/Makefile
+@@ -6,6 +6,7 @@ include config.mk
+
+ REQ = util
+ COM =\
++ components/backlight\
+ components/battery\
+ components/cat\
+ components/cpu\
+diff --git a/components/backlight.c b/components/backlight.c
+new file mode 100644
+index 0000000..4c8af53
+--- /dev/null
++++ b/components/backlight.c
+@@ -0,0 +1,93 @@
++/* See LICENSE file for copyright and license details. */
++
++#include <stddef.h>
++
++#include "../util.h"
++
++#if defined(__linux__)
++ #include <limits.h>
++
++ #define BRIGHTNESS_MAX "/sys/class/backlight/%s/max_brightness"
++ #define BRIGHTNESS_CUR "/sys/class/backlight/%s/brightness"
++
++ const char *
++ backlight_perc(const char *card)
++ {
++ char path[PATH_MAX];
++ int max, cur;
++
++ if (esnprintf(path, sizeof (path), BRIGHTNESS_MAX, card) < 0 ||
++ pscanf(path, "%d", &max) != 1) {
++ return NULL;
++ }
++
++ if (esnprintf(path, sizeof (path), BRIGHTNESS_CUR, card) < 0 ||
++ pscanf(path, "%d", &cur) != 1) {
++ return NULL;
++ }
++
++ if (max == 0) {
++ return NULL;
++ }
++
++ return bprintf("%d%%", cur * 100 / max);
++ }
++#elif defined(__OpenBSD__)
++ #include <fcntl.h>
++ #include <sys/ioctl.h>
++ #include <sys/time.h>
++ #include <dev/wscons/wsconsio.h>
++ #include <unistd.h>
++
++ const char *
++ backlight_perc(const char *unused)
++ {
++ int fd, err;
++ struct wsdisplay_param wsd_param = {
++ .param = WSDISPLAYIO_PARAM_BRIGHTNESS
++ };
++
++ if ((fd = open("/dev/ttyC0", O_RDONLY)) < 0) {
++ warn("could not open /dev/ttyC0");
++ return NULL;
++ }
++ if ((err = ioctl(fd, WSDISPLAYIO_GETPARAM, &wsd_param)) < 0) {
++ warn("ioctl 'WSDISPLAYIO_GETPARAM' failed");
++ close(fd);
++ return NULL;
++ }
++
++ close(fd);
++ return bprintf("%d", wsd_param.curval * 100 / wsd_param.max);
++ }
++#elif defined(__FreeBSD__)
++ #include <fcntl.h>
++ #include <stdio.h>
++ #include <sys/ioctl.h>
++ #include <sys/backlight.h>
++ #include <unistd.h>
++
++ #define FBSD_BACKLIGHT_DEV "/dev/backlight/%s"
++
++ const char *
++ backlight_perc(const char *card)
++ {
++ char buf[256];
++ struct backlight_props props;
++ int fd;
++
++ snprintf(buf, sizeof(buf), FBSD_BACKLIGHT_DEV, card);
++ if ((fd = open(buf, O_RDWR)) == -1) {
++ warn("could not open %s", card);
++ return NULL;
++ }
++ if (ioctl(fd, BACKLIGHTGETSTATUS, &props) == -1){
++ warn("Cannot query the backlight device");
++ close(fd);
++ return NULL;
++ }
++
++ close(fd);
++ return bprintf("%d", props.brightness);
++ }
++#endif
+diff --git a/config.def.h b/config.def.h
+index 100093e..69e1624 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -12,6 +12,9 @@ static const char unknown_str[] = "n/a";
+ /*
+ * function description argument (example)
+ *
++ * backlight_perc backlight percentage device name
++ * (intel_backlight, numbered on FreeBSD)
++ * NULL on OpenBSD
+ * battery_perc battery percentage battery name (BAT0)
+ * NULL on OpenBSD/FreeBSD
+ * battery_remaining battery remaining HH:MM battery name (BAT0)
+diff --git a/slstatus.h b/slstatus.h
+index 394281c..29d3b01 100644
+--- a/slstatus.h
++++ b/slstatus.h
+@@ -1,5 +1,8 @@
+ /* See LICENSE file for copyright and license details. */
+
++/* backlight */
++const char *backlight_perc(const char *);
++
+ /* battery */
+ const char *battery_perc(const char *);
+ const char *battery_remaining(const char *);
+--
+2.53.0
+