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, 11 insertions, 1 deletions

diff --git a/lib/libc/gen/ctermid.c b/lib/libc/gen/ctermid.c
index 9bb0a594880..8b4d46d1f1c 100644
--- a/lib/libc/gen/ctermid.c
+++ b/lib/libc/gen/ctermid.c
@@ -32,7 +32,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: ctermid.c,v 1.2 1996/08/19 08:22:03 tholo Exp $";
+static char rcsid[] = "$OpenBSD: ctermid.c,v 1.3 1998/11/20 11:18:37 d Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <stdio.h>
@@ -51,3 +51,13 @@ ctermid(s)
 	}
 	return(def);
 }
+
+char *
+ctermid_r(s)
+	char *s;
+{
+	if (s)
+		return ctermid(s);
+	else
+		return(NULL);
+}