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-rw-r--r--posix/unistd.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index db952883f2..38ca4f0b4b 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -427,8 +427,8 @@ extern int isatty __P ((int __fd));
 
 #ifdef __USE_BSD
 /* Return the index into the active-logins file (utmp) for
-   the terminal FD is open on.  */
-extern int ttyslot ((int __fd));
+   the controlling terminal.  */
+extern int ttyslot __P ((void));
 #endif