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, 23 insertions, 4 deletions

diff --git a/lib/libc/stdio/putc.c b/lib/libc/stdio/putc.c
index b43af508a55..f9a23b2cd41 100644
--- a/lib/libc/stdio/putc.c
+++ b/lib/libc/stdio/putc.c
@@ -35,7 +35,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: putc.c,v 1.3 1996/10/28 05:32:55 tholo Exp $";
+static char rcsid[] = "$OpenBSD: putc.c,v 1.4 1998/11/20 11:18:48 d Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <stdio.h>
@@ -43,11 +43,12 @@ static char rcsid[] = "$OpenBSD: putc.c,v 1.3 1996/10/28 05:32:55 tholo Exp $";
 #include "local.h"
 
 /*
- * A subroutine version of the macro putc.
+ * A subroutine version of the macro putc_unlocked.
  */
-#undef putc
+#undef putc_unlocked
 
-putc(c, fp)
+int
+putc_unlocked(c, fp)
 	int c;
 	register FILE *fp;
 {
@@ -57,3 +58,21 @@ putc(c, fp)
 	}
 	return (__sputc(c, fp));
 }
+
+/*
+ * A subroutine version of the macro putc.
+ */
+#undef putc
+
+int
+putc(c, fp)
+	int c;
+	FILE *fp;
+{
+	int ret;
+
+	flockfile(fp);
+	ret = putc_unlocked(c, fp);
+	funlockfile(fp);
+	return (ret);
+}