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Instead of copying fallback code over and over in each program,

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implement (better) falback code inside srandomdev() itself.
Change return type from int to void (binary compatibility surprisely
achieved). Userland code will be changed soon.
This commit is contained in:
Andrey A. Chernov 1997-06-14 00:14:29 +00:00
parent 854d14213e
commit 96c31b2618
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=26624
3 changed files with 18 additions and 16 deletions
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2
include/stdlib.h
View File

@ -160,7 +160,7 @@ long random __P((void));
char *realpath __P((const char *, char resolved_path[]));
char *setstate __P((char *));
void srandom __P((unsigned long));
int srandomdev __P((void));
void srandomdev __P((void));
char *user_from_uid __P((unsigned long, int));
#ifndef __STRICT_ANSI__
long long

7
lib/libc/stdlib/random.3
View File

@ -47,7 +47,7 @@
.Fn random void
.Ft void
.Fn srandom "unsigned long seed"
.Ft int
.Ft void
.Fn srandomdev void
.Ft char *
.Fn initstate "unsigned long seed" "char *state" "long n"
@ -108,11 +108,6 @@ calling
with any value, since the succeeding terms in the
state buffer are no longer derived from the LC algorithm applied to
a fixed seed.
If successful
.Fn srandomdev
returns 0. It returns -1 on failure, and sets
.Va errno
to indicate the error.
.Pp
The
.Fn initstate

25
lib/libc/stdlib/random.c
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: random.c,v 1.8 1997/03/29 19:55:03 ache Exp $
*
*/
@ -38,6 +38,7 @@
static char sccsid[] = "@(#)random.c 8.2 (Berkeley) 5/19/95";
#endif /* LIBC_SCCS and not lint */
#include <sys/time.h> /* for srandomdev() */
#include <fcntl.h> /* for srandomdev() */
#include <stdio.h>
#include <stdlib.h>
@ -285,10 +286,10 @@ srandom(x)
* state buffer are no longer derived from the LC algorithm applied to
* a fixed seed.
*/
int
void
srandomdev()
{
int fd;
int fd, done;
size_t len;
if (rand_type == TYPE_0)
@ -296,20 +297,26 @@ srandomdev()
else
len = rand_deg * sizeof state[0];
done = 0;
fd = open("/dev/urandom", O_RDONLY, 0);
if (fd < 0)
return -1;
if (read(fd, (void *) state, len) < (ssize_t) len) {
if (fd >= 0) {
if (read(fd, (void *) state, len) == (ssize_t) len)
done = 1;
close(fd);
return -1;
}
close(fd);
if (!done) {
struct timeval tv;
gettimeofday(&tv, NULL);
srandom(getpid() ^ tv.tv_sec ^ tv.tv_usec);
return;
}
if (rand_type != TYPE_0) {
fptr = &state[rand_sep];
rptr = &state[0];
}
return 0;
}
/*