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/*
* This source code is released into the public domain.
*/
/*
* fd: a file descriptor.
*/
#ifndef LFJAIL_FD_HH
#define LFJAIL_FD_HH
#include <fcntl.h>
#include <unistd.h>
#include "generic_error.hh"
namespace lfjail {
struct fd final {
// Construct an empty (invalid) fd.
fd() noexcept = default;
~fd();
// Construct an fd by taking ownership of an exiting fd.
fd(int fd_) noexcept;
// Move from another fd, leaving the moved-from fd in an invalid state.
fd(fd &&other) noexcept;
auto operator=(fd &&other) noexcept -> fd &;
// Not copyable.
fd(fd const &) = delete;
fd& operator=(fd const &) = delete;
// Return true if this fd is valid (open).
explicit operator bool(this fd const &self) noexcept;
// Close the stored fd. Errors are discarded.
auto close(this fd &self) -> void;
// Return the stored fd.
auto get(this fd const &self) -> int;
// Release the stored fd and return it. The caller must close
// the fd.
auto release() && noexcept -> int;
private:
static constexpr int _invalid_fd = -1;
int _fd = _invalid_fd;
};
// Create a copy of this fd by calling dup().
auto dup(fd const &self) -> fd;
// Create a copy of this fd by calling dup2(). The second argument
// must not be managed by an instance of the fd class, or else it
// will be closed twice.
auto dup(fd const &self, int newfd) -> fd;
// Return the fnctl flags for this fd.
auto getflags(fd const &self) -> int;
// Replace the fnctl flags for this fd.
auto replaceflags(fd &self, int newflags) -> void;
// Add bits to the fcntl flags for this fd.
auto setflags(fd &self, int newflags) -> void;
// Remove bits from the fcntl flags for this fd.
auto clearflags(fd &self, int clrflags) -> void;
// Create two fds by calling pipe() and return them.
auto pipe() -> std::pair<fd, fd>;
} // namespace lfjail
#endif // !LFJAIL_FD_HH
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