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#pragma once
///@file
#include "error.hh"
namespace nix {
struct Sink;
struct Source;
/**
* Read a line from a file descriptor.
*/
std::string readLine(int fd);
/**
* Write a line to a file descriptor.
*/
void writeLine(int fd, std::string s);
/**
* Read the contents of a file into a string.
*/
std::string readFile(int fd);
/**
* Wrappers arount read()/write() that read/write exactly the
* requested number of bytes.
*/
void readFull(int fd, char * buf, size_t count);
void writeFull(int fd, std::string_view s, bool allowInterrupts = true);
/**
* Read a file descriptor until EOF occurs.
*/
std::string drainFD(int fd, bool block = true, const size_t reserveSize=0);
void drainFD(int fd, Sink & sink, bool block = true);
class AutoCloseFD
{
int fd;
public:
AutoCloseFD();
explicit AutoCloseFD(int fd);
AutoCloseFD(const AutoCloseFD & fd) = delete;
AutoCloseFD(AutoCloseFD&& fd);
~AutoCloseFD();
AutoCloseFD& operator =(const AutoCloseFD & fd) = delete;
AutoCloseFD& operator =(AutoCloseFD&& fd) noexcept(false);
int get() const;
explicit operator bool() const;
int release();
void close();
void fsync();
void reset() { *this = {}; }
};
class Pipe
{
public:
AutoCloseFD readSide, writeSide;
void create();
void close();
};
/**
* Close all file descriptors except those listed in the given set.
* Good practice in child processes.
*/
void closeMostFDs(const std::set<int> & exceptions);
/**
* Set the close-on-exec flag for the given file descriptor.
*/
void closeOnExec(int fd);
MakeError(EndOfFile, Error);
}
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