Slightly safer OOM killer disablement in linux - slock - simple X display locker utility
 (HTM) git clone git://git.suckless.org/slock
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       ---
 (DIR) commit 0edbd2e0164a8c6cbad415e38083469041f29996
 (DIR) parent 754195f8d75586e23d1cc69cad00710802e0cb5d
 (HTM) Author: David Phillips <dbphillipsnz@gmail.com>
       Date:   Fri, 19 Jun 2015 23:42:15 +1200
       
       Slightly safer OOM killer disablement in linux
       
       Diffstat:
         M slock.c                             |      13 ++++++++++++-
       
       1 file changed, 12 insertions(+), 1 deletion(-)
       ---
 (DIR) diff --git a/slock.c b/slock.c
       @@ -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