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From 3abbffa4934a62146e995ee7c2cf3ba50991b4ad Mon Sep 17 00:00:00 2001
From: FRIGN <dev@frign.de>
Date: Sun, 14 Feb 2016 01:28:37 +0100
Subject: [PATCH 1/7] Simplify the oom-taming-function
There really is no need to source a defined variable from a linux
header. The OOM-rank ranges from -1000 to 1000, so we can safely
hardcode -1000, which is a sane thing to do given slock is suid and
we don't want to play around too much here anyway.
On another notice, let's not forget that this still is a shitty
heuristic. The OOM-killer still can kill us (thus I also changed
the wording in the error-message. We do not disable the OOM-killer,
we're just hiding.
---
slock.c | 20 ++++++--------------
1 file changed, 6 insertions(+), 14 deletions(-)
diff --git a/slock.c b/slock.c
index cf49555..3188ff7 100644
--- a/slock.c
+++ b/slock.c
@@ -60,28 +60,20 @@ die(const char *errstr, ...)
#ifdef __linux__
#include <fcntl.h>
-#include <linux/oom.h>
static void
dontkillme(void)
{
int fd;
- int length;
- char value[64];
fd = open("/proc/self/oom_score_adj", O_WRONLY);
- if (fd < 0 && errno == ENOENT)
+ if (fd < 0 && errno == ENOENT) {
return;
-
- /* convert OOM_SCORE_ADJ_MIN to string for writing */
- length = snprintf(value, sizeof(value), "%d\n", OOM_SCORE_ADJ_MIN);
-
- /* bail on truncation */
- if (length >= sizeof(value))
- die("buffer too small\n");
-
- if (fd < 0 || write(fd, value, length) != length || close(fd) != 0)
- die("cannot disable the out-of-memory killer for this process (make sure to suid or sgid slock)\n");
+ }
+ if (fd < 0 || write(fd, "-1000\n", (sizeof("-1000\n") - 1)) !=
+ (sizeof("-1000\n") - 1) || close(fd) != 0) {
+ die("can't tame the oom-killer. is suid or sgid set?\n");
+ }
}
#endif
--
2.9.2
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