[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/sysdeps/posix/flock.c b/ap/libc/glibc/glibc-2.23/sysdeps/posix/flock.c
new file mode 100644
index 0000000..c621a5b
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/sysdeps/posix/flock.c
@@ -0,0 +1,56 @@
+/* Copyright (C) 1992-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* This file implements the `flock' function in terms of the POSIX.1 `fcntl'
+ locking mechanism. In 4BSD, these are two incompatible locking mechanisms,
+ perhaps with different semantics? */
+
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/file.h>
+
+/* Apply or remove an advisory lock, according to OPERATION,
+ on the file FD refers to. */
+int
+__flock (int fd, int operation)
+{
+ struct flock lbuf;
+
+ switch (operation & ~LOCK_NB)
+ {
+ case LOCK_SH:
+ lbuf.l_type = F_RDLCK;
+ break;
+ case LOCK_EX:
+ lbuf.l_type = F_WRLCK;
+ break;
+ case LOCK_UN:
+ lbuf.l_type = F_UNLCK;
+ break;
+ default:
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ lbuf.l_whence = SEEK_SET;
+ lbuf.l_start = lbuf.l_len = 0L; /* Lock the whole file. */
+
+ return __fcntl (fd, (operation & LOCK_NB) ? F_SETLK : F_SETLKW, &lbuf);
+}
+
+weak_alias (__flock, flock)