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-rw-r--r--misc/getusershell.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/misc/getusershell.c b/misc/getusershell.c
index 5ac08ce7f8..c15b8f664f 100644
--- a/misc/getusershell.c
+++ b/misc/getusershell.c
@@ -35,6 +35,7 @@ static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
#include <sys/file.h>
#include <sys/stat.h>
#include <stdio.h>
+#include <stdio_ext.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
@@ -116,6 +117,8 @@ initshells()
strings = NULL;
return (char **) okshells;
}
+ /* No threads using this stream. */
+ __fsetlocking (fp, FSETLOCKING_BYCALLER);
sp = shells;
cp = strings;
flen = statb.st_size;