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random_seed: Only read /dev/*random if we have unistd.h 

unistd.h is used for open/read/close, but if this header does not
exist, there's probably no use in trying to open /dev/*random
at all.

Signed-off-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Ronald S. Bultje 2012-06-24 21:26:31 +03:00 committed by Michael Niedermayer
parent 9d0bc5c0bd
commit a4d71eb5c3
1 changed files with 8 additions and 0 deletions
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8
libavutil/random_seed.c
View File

@ -18,7 +18,11 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <math.h>
#include <time.h>
@ -34,6 +38,7 @@
static int read_random(uint32_t *dst, const char *file)
{
#if HAVE_UNISTD_H
int fd = open(file, O_RDONLY);
int err = -1;
@ -43,6 +48,9 @@ static int read_random(uint32_t *dst, const char *file)
close(fd);
return err;
#else
return -1;
#endif
}
static uint32_t get_generic_seed(void)