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, 19 insertions, 2 deletions

diff --git a/lib/libc/stdio/getc.c b/lib/libc/stdio/getc.c
index ff4a5168a3f..ce990968202 100644
--- a/lib/libc/stdio/getc.c
+++ b/lib/libc/stdio/getc.c
@@ -35,12 +35,24 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: getc.c,v 1.2 1996/08/19 08:32:51 tholo Exp $";
+static char rcsid[] = "$OpenBSD: getc.c,v 1.3 1998/11/20 11:18:48 d Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <stdio.h>
 
 /*
+ * A subroutine version of the macro getc_unlocked.
+ */
+#undef getc_unlocked
+
+int
+getc_unlocked(fp)
+	FILE *fp;
+{
+	return (__sgetc(fp));
+}
+
+/*
  * A subroutine version of the macro getc.
  */
 #undef getc
@@ -49,5 +61,10 @@ int
 getc(fp)
 	register FILE *fp;
 {
-	return (__sgetc(fp));
+	int c;
+
+	flockfile(fp);
+	c = __sgetc(fp);
+	funlockfile(fp);
+	return (c);
 }