Port over the last of the tinylogin applets

[oweals/busybox.git] / libbb / libc5.c

diff --git a/libbb/libc5.c b/libbb/libc5.c
index df622f65bb69cd6326fd407d9cef0fb7215b210b..af15d1ac7d689b557af950bd8cd0f28c3b856359 100644 (file)
--- a/libbb/libc5.c
+++ b/libbb/libc5.c
@@ -11,6 +11,24 @@
 
 #if __GNU_LIBRARY__ < 5
 
+/*
+ * Some systems already have updwtmp().  Some don't...  This is
+ * the updwtmp() implementation from uClibc, Copyright 2002 by
+ * Erik Andersen <andersee@debian.org> 
+ */
+extern void updwtmp(const char *wtmp_file, const struct utmp *lutmp)
+{
+       int fd;
+
+       fd = open(wtmp_file, O_APPEND | O_WRONLY, 0);
+       if (fd >= 0) {
+               if (lockf(fd, F_LOCK, 0)==0) {
+                       write(fd, (const char *) lutmp, sizeof(struct utmp));
+                       lockf(fd, F_ULOCK, 0);
+                       close(fd);
+               }
+       }
+}
 
 /* Copyright (C) 1991 Free Software Foundation, Inc.
 This file is part of the GNU C Library.