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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>
This commit is contained in:
Ronald S. Bultje 2012-06-24 21:26:31 +03:00 committed by Martin Storsjö
parent e312fcde6a
commit f985113075
1 changed files with 8 additions and 0 deletions
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8
libavutil/random_seed.c
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@ -18,7 +18,11 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/ */
#include "config.h"
#if HAVE_UNISTD_H
#include <unistd.h> #include <unistd.h>
#endif
#include <fcntl.h> #include <fcntl.h>
#include <math.h> #include <math.h>
#include <time.h> #include <time.h>
@ -27,6 +31,7 @@
static int read_random(uint32_t *dst, const char *file) static int read_random(uint32_t *dst, const char *file)
{ {
#if HAVE_UNISTD_H
int fd = open(file, O_RDONLY); int fd = open(file, O_RDONLY);
int err = -1; int err = -1;
@ -36,6 +41,9 @@ static int read_random(uint32_t *dst, const char *file)
close(fd); close(fd);
return err; return err;
#else
return -1;
#endif
} }
static uint32_t get_generic_seed(void) static uint32_t get_generic_seed(void)