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Slightly safer OOM killer disablement in linux

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David Phillips 2015-06-19 23:42:15 +12:00 committed by Markus Teich
parent 754195f8d7
commit 0edbd2e016
1 changed files with 12 additions and 1 deletions
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13
slock.c
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@ -60,16 +60,27 @@ die(const char *errstr, ...)
#ifdef __linux__ #ifdef __linux__
#include <fcntl.h> #include <fcntl.h>
#include <linux/oom.h>
static void static void
dontkillme(void) dontkillme(void)
{ {
int fd; int fd;
int length;
char value[64];
fd = open("/proc/self/oom_score_adj", O_WRONLY); fd = open("/proc/self/oom_score_adj", O_WRONLY);
if (fd < 0 && errno == ENOENT) if (fd < 0 && errno == ENOENT)
return; return;
if (fd < 0 || write(fd, "-1000\n", 6) != 6 || close(fd) != 0)
/* 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\n"); die("cannot disable the out-of-memory killer for this process\n");
} }
#endif #endif