~ob/slock

0edbd2e0164a8c6cbad415e38083469041f29996 — David Phillips 6 years ago 754195f
Slightly safer OOM killer disablement in linux
1 files changed, 12 insertions(+), 1 deletions(-)

M slock.c
M slock.c => slock.c +12 -1
@@ 60,16 60,27 @@ 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)
		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");
}
#endif