file-descriptor.hh

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#pragma once
 
#include "lix/libutil/error.hh"
#include "lix/libutil/generator.hh"
 
namespace nix {
 
struct Sink;
struct Source;
 
std::string readLine(int fd);
 
void writeLine(int fd, std::string s);
 
std::string readFile(int fd);
 
void readFull(int fd, char * buf, size_t count);
void writeFull(int fd, std::string_view s, bool allowInterrupts = true);
 
std::string drainFD(int fd, bool block = true, const size_t reserveSize=0);
 
Generator<Bytes> drainFDSource(int fd, 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();
};
 
void closeExtraFDs();
 
void closeOnExec(int fd);
 
MakeError(EndOfFile, Error);
 
}