From c1f295aa8666eb1c08a1edf944ac5617659a066c Mon Sep 17 00:00:00 2001
From: d <>
Date: Fri, 20 Nov 1998 11:18:51 +0000
Subject: Add thread-safety to libc, so that libc_r will build (on i386 at
 least). All POSIX libc api now there (to P1003.1c/D10)   (more md stuff is
 needed for other libc/arch/*)   (setlogin is no longer a special syscall) Add
 -pthread option to gcc (that makes it use -lc_r and -D_POSIX_THREADS). Doc
 some re-entrant routines Add libc_r to intro(3) dig() uses some libc srcs and
 an extra -I was needed there. Add more md stuff to libc_r. Update includes
 for the pthreads api Update libc_r TODO

---
 src/lib/libc/stdlib/rand.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'src/lib/libc/stdlib/rand.c')

diff --git a/src/lib/libc/stdlib/rand.c b/src/lib/libc/stdlib/rand.c
index f270ffd986..61fb66e5ec 100644
--- a/src/lib/libc/stdlib/rand.c
+++ b/src/lib/libc/stdlib/rand.c
@@ -32,7 +32,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: rand.c,v 1.2 1996/08/19 08:33:44 tholo Exp $";
+static char *rcsid = "$OpenBSD: rand.c,v 1.3 1998/11/20 11:18:50 d Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -40,10 +40,18 @@ static char *rcsid = "$OpenBSD: rand.c,v 1.2 1996/08/19 08:33:44 tholo Exp $";
 
 static u_long next = 1;
 
+int
+rand_r(seed)
+u_int *seed;
+{
+	*seed = *seed * 1103515245 + 12345;
+	return (u_int)(*seed / 65536) % ((u_int)RAND_MAX + 1);
+}
+
 int
 rand()
 {
-	return ((next = next * 1103515245 + 12345) % ((u_int)RAND_MAX + 1));
+	return rand_r(&next);
 }
 
 void
-- 
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