93 lines
2.8 KiB
Diff
93 lines
2.8 KiB
Diff
--- /dev/null 2016-12-11 08:33:21.825618476 +0530
|
|
+++ ./cups/lockf.cpp 2016-12-11 09:44:20.050966252 +0530
|
|
@@ -0,0 +1,89 @@
|
|
+/*
|
|
+ * Copyright (C) 2016 The Android Open Source Project
|
|
+ * All rights reserved.
|
|
+ *
|
|
+ * Redistribution and use in source and binary forms, with or without
|
|
+ * modification, are permitted provided that the following conditions
|
|
+ * are met:
|
|
+ * * Redistributions of source code must retain the above copyright
|
|
+ * notice, this list of conditions and the following disclaimer.
|
|
+ * * Redistributions in binary form must reproduce the above copyright
|
|
+ * notice, this list of conditions and the following disclaimer in
|
|
+ * the documentation and/or other materials provided with the
|
|
+ * distribution.
|
|
+ *
|
|
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
+ * SUCH DAMAGE.
|
|
+ */
|
|
+#include <unistd.h>
|
|
+#include <errno.h>
|
|
+#include <fcntl.h>
|
|
+#include <string.h>
|
|
+
|
|
+#ifndef _BITS_LOCKF_H_
|
|
+#define _BITS_LOCKF_H_
|
|
+
|
|
+#include <sys/cdefs.h>
|
|
+
|
|
+#define F_ULOCK 0
|
|
+#define F_LOCK 1
|
|
+#define F_TLOCK 2
|
|
+#define F_TEST 3
|
|
+
|
|
+__BEGIN_DECLS
|
|
+
|
|
+#if defined(__USE_FILE_OFFSET64)
|
|
+int lockf(int, int, off_t) __RENAME(lockf64);
|
|
+#else
|
|
+int lockf(int, int, off_t);
|
|
+#endif
|
|
+int lockf64(int, int, off64_t);
|
|
+
|
|
+__END_DECLS
|
|
+
|
|
+#endif
|
|
+
|
|
+
|
|
+int lockf64(int fd, int cmd, off64_t length) {
|
|
+ // Translate POSIX lockf into fcntl.
|
|
+ struct flock fl;
|
|
+ memset(&fl, 0, sizeof(fl));
|
|
+ fl.l_whence = SEEK_CUR;
|
|
+ fl.l_start = 0;
|
|
+ fl.l_len = length;
|
|
+ if (cmd == F_ULOCK) {
|
|
+ fl.l_type = F_UNLCK;
|
|
+ cmd = F_SETLK64;
|
|
+ return fcntl(fd, F_SETLK64, &fl);
|
|
+ }
|
|
+ if (cmd == F_LOCK) {
|
|
+ fl.l_type = F_WRLCK;
|
|
+ return fcntl(fd, F_SETLKW64, &fl);
|
|
+ }
|
|
+ if (cmd == F_TLOCK) {
|
|
+ fl.l_type = F_WRLCK;
|
|
+ return fcntl(fd, F_SETLK64, &fl);
|
|
+ }
|
|
+ if (cmd == F_TEST) {
|
|
+ fl.l_type = F_RDLCK;
|
|
+ if (fcntl(fd, F_GETLK64, &fl) == -1) return -1;
|
|
+ if (fl.l_type == F_UNLCK || fl.l_pid == getpid()) return 0;
|
|
+ errno = EACCES;
|
|
+ return -1;
|
|
+ }
|
|
+ errno = EINVAL;
|
|
+ return -1;
|
|
+}
|
|
+int lockf(int fd, int cmd, off_t length) {
|
|
+ return lockf64(fd, cmd, length);
|
|
+}
|