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