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

1 files changed, 10 insertions, 2 deletions

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>
@@ -41,9 +41,17 @@ 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