/*
- * Copyright 2013 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <fcntl.h>
#include <unistd.h>
+#include <folly/Portability.h>
+
namespace folly {
/**
* Create a File object from an existing file descriptor.
* Takes ownership of the file descriptor if ownsFd is true.
*/
- /* implicit */ File(int fd,
- bool ownsFd = false);
+ explicit File(int fd, bool ownsFd = false);
/**
* Open and create a file object. Throws on error.
*/
- /* implicit */ File(const char* name,
- int flags = O_RDONLY,
- mode_t mode = 0644);
+ explicit File(const char* name, int flags = O_RDONLY, mode_t mode = 0666);
~File();
* Returns 'true' iff the file was successfully opened.
*/
explicit operator bool() const {
- return fd_ >= 0;
+ return fd_ != -1;
}
+ /**
+ * Duplicate file descriptor and return File that owns it.
+ */
+ File dup() const;
+
/**
* If we own the file descriptor, close the file and throw on error.
* Otherwise, do nothing.
bool closeNoThrow();
/**
- * Releases the file descriptor; no longer owned by this File.
+ * Returns and releases the file descriptor; no longer owned by this File.
+ * Returns -1 if the File object didn't wrap a file.
*/
- void release();
+ int release() noexcept;
/**
* Swap this File with another.
void swap(File& other);
// movable
- File(File&&);
+ File(File&&) noexcept;
File& operator=(File&&);
// FLOCK (INTERPROCESS) LOCKS