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-rw-r--r--posix/unistd.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index b48f24b389..15c40c434d 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -650,6 +650,9 @@ extern int chroot __P ((__const char *__path));
    This call is restricted to the super-user.  */
 extern int swapon __P ((__const char *__path));
 
+/* Stop using block special device PATH for swapping.  */
+extern int swapoff __P ((__const char *__path));
+
 /* Reboot or halt the system.  */
 extern int reboot __P ((int __howto));