From f70177e76e605ec6e6cd5b938fa77ade5d380e87 Mon Sep 17 00:00:00 2001
From: Julian Elischer <julian@FreeBSD.org>
Date: Mon, 22 Jan 1996 00:02:33 +0000
Subject: Reviewed by:	julian and (hsu?) Submitted by:	 John Birrel(L?)

changes for threadsafe operations
---
 lib/libc/gen/isatty.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'lib/libc/gen/isatty.c')

diff --git a/lib/libc/gen/isatty.c b/lib/libc/gen/isatty.c
index f6bb04b86316..c8356c710342 100644
--- a/lib/libc/gen/isatty.c
+++ b/lib/libc/gen/isatty.c
@@ -37,12 +37,27 @@ static char sccsid[] = "@(#)isatty.c	8.1 (Berkeley) 6/4/93";
 
 #include <termios.h>
 #include <unistd.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+#endif
 
 int
 isatty(fd)
 	int fd;
 {
+	int retval;
 	struct termios t;
 
-	return(tcgetattr(fd, &t) != -1);
+#ifdef _THREAD_SAFE
+	if (_thread_fd_lock(fd, FD_READ, NULL,__FILE__,__LINE__) == 0) {
+#endif
+		retval = (tcgetattr(fd, &t) != -1);
+#ifdef _THREAD_SAFE
+        _thread_fd_unlock(fd, FD_READ);
+	} else {
+		retval = 0;
+	}
+#endif
+	return(retval);
 }
-- 
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