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15658b259f
The short answer for why we need to do this is so we can consistently do
`#include "nix/..."`. Without this change, there are ways to still make
that work, but they are hacky, and they have downsides such as making it
harder to make sure headers from the wrong Nix library (e..g.
`libnixexpr` headers in `libnixutil`) aren't being used.
The C API alraedy used `nix_api_*`, so its headers are *not* put in
subdirectories accordingly.
Progress on #7876
We resisted doing this for a while because it would be annoying to not
have the header source file pairs close by / easy to change file
path/name from one to the other. But I am ameliorating that with
symlinks in the next commit.
(cherry picked from commit f3e1c47f47)
148 lines
2.7 KiB
C++
148 lines
2.7 KiB
C++
#include "nix/serialise.hh"
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#include "nix/util.hh"
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef _WIN32
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# include <winnt.h>
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# include <fileapi.h>
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# include "nix/windows-error.hh"
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#endif
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namespace nix {
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void writeLine(Descriptor fd, std::string s)
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{
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s += '\n';
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writeFull(fd, s);
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}
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std::string drainFD(Descriptor fd, bool block, const size_t reserveSize)
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{
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// the parser needs two extra bytes to append terminating characters, other users will
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// not care very much about the extra memory.
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StringSink sink(reserveSize + 2);
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#ifdef _WIN32
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// non-blocking is not supported this way on Windows
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assert(block);
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drainFD(fd, sink);
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#else
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drainFD(fd, sink, block);
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#endif
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return std::move(sink.s);
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}
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//////////////////////////////////////////////////////////////////////
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AutoCloseFD::AutoCloseFD() : fd{INVALID_DESCRIPTOR} {}
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AutoCloseFD::AutoCloseFD(Descriptor fd) : fd{fd} {}
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// NOTE: This can be noexcept since we are just copying a value and resetting
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// the file descriptor in the rhs.
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AutoCloseFD::AutoCloseFD(AutoCloseFD && that) noexcept : fd{that.fd}
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{
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that.fd = INVALID_DESCRIPTOR;
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}
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AutoCloseFD & AutoCloseFD::operator =(AutoCloseFD && that)
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{
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close();
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fd = that.fd;
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that.fd = INVALID_DESCRIPTOR;
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return *this;
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}
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AutoCloseFD::~AutoCloseFD()
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{
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try {
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close();
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} catch (...) {
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ignoreExceptionInDestructor();
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}
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}
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Descriptor AutoCloseFD::get() const
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{
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return fd;
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}
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void AutoCloseFD::close()
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{
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if (fd != INVALID_DESCRIPTOR) {
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if(
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#ifdef _WIN32
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::CloseHandle(fd)
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#else
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::close(fd)
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#endif
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== -1)
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/* This should never happen. */
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throw NativeSysError("closing file descriptor %1%", fd);
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fd = INVALID_DESCRIPTOR;
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}
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}
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void AutoCloseFD::fsync() const
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{
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if (fd != INVALID_DESCRIPTOR) {
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int result;
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result =
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#ifdef _WIN32
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::FlushFileBuffers(fd)
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#elif __APPLE__
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::fcntl(fd, F_FULLFSYNC)
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#else
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::fsync(fd)
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#endif
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;
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if (result == -1)
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throw NativeSysError("fsync file descriptor %1%", fd);
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}
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}
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void AutoCloseFD::startFsync() const
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{
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#if __linux__
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if (fd != -1) {
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/* Ignore failure, since fsync must be run later anyway. This is just a performance optimization. */
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::sync_file_range(fd, 0, 0, SYNC_FILE_RANGE_WRITE);
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}
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#endif
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}
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AutoCloseFD::operator bool() const
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{
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return fd != INVALID_DESCRIPTOR;
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}
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Descriptor AutoCloseFD::release()
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{
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Descriptor oldFD = fd;
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fd = INVALID_DESCRIPTOR;
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return oldFD;
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}
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//////////////////////////////////////////////////////////////////////
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void Pipe::close()
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{
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readSide.close();
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writeSide.close();
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}
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}
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