1 files changed, 14 insertions, 1 deletions

diff --git a/lib/libc/stdio/fputs.c b/lib/libc/stdio/fputs.c
index 9f9be2e2feee..92fcc303a690 100644
--- a/lib/libc/stdio/fputs.c
+++ b/lib/libc/stdio/fputs.c
@@ -41,14 +41,20 @@ static char sccsid[] = "@(#)fputs.c	8.1 (Berkeley) 6/4/93";
 #include <stdio.h>
 #include <string.h>
 #include "fvwrite.h"
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+#endif
 
 /*
  * Write the given string to the given file.
  */
+int
 fputs(s, fp)
 	const char *s;
 	FILE *fp;
 {
+	int retval;
 	struct __suio uio;
 	struct __siov iov;
 
@@ -56,5 +62,12 @@ fputs(s, fp)
 	iov.iov_len = uio.uio_resid = strlen(s);
 	uio.uio_iov = &iov;
 	uio.uio_iovcnt = 1;
-	return (__sfvwrite(fp, &uio));
+#ifdef _THREAD_SAFE
+	_thread_flockfile(fp,__FILE__,__LINE__);
+#endif
+	retval = __sfvwrite(fp, &uio);
+#ifdef _THREAD_SAFE
+	_thread_funlockfile(fp);
+#endif
+	return (retval);
 }