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random_seed: allow to block on /dev/random

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If both /dev/random and /dev/urandom failed to return data, an
uninitialised value might be returned.  Since most systems have a
non-blocking /dev/urandom or have /dev/random with similar properties,
the chance of blocking is minimal, and the alternative of returning
non-random data is worse.

Originally committed as revision 23930 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-07-01 11:40:50 +00:00
parent a158446b28
commit b7fa5c5abb
1 changed files with 0 additions and 3 deletions
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3
libavutil/random_seed.c
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@ -31,9 +31,6 @@ static int read_random(uint32_t *dst, const char *file)
if (fd == -1) if (fd == -1)
return -1; return -1;
#if HAVE_FCNTL && defined(O_NONBLOCK)
if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK) != -1)
#endif
err = read(fd, dst, sizeof(*dst)); err = read(fd, dst, sizeof(*dst));
close(fd); close(fd);