random_seed: try other alternatives if reading /dev/random fails

Originally committed as revision 22450 to svn://svn.ffmpeg.org/ffmpeg/trunk
15 years ago · 49e9287878
parent 32f40ace25
commit 49e9287878
1 changed files with 2 additions and 1 deletions
--- a/libavutil/random_seed.c
+++ b/libavutil/random_seed.c
@ -31,8 +31,9 @@ uint32_t ff_random_get_seed(void)
    if ((fd = open("/dev/random", O_RDONLY)) == -1)
        fd = open("/dev/urandom", O_RDONLY);
    if (fd != -1){
-        read(fd, &seed, 4);
+        int err = read(fd, &seed, 4);
        close(fd);
+        if (err == 4)
        return seed;
    }
 #ifdef AV_READ_TIME