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#include "common.hh"
#include <errno.h>
#include <unistd.h>
#include "io.hh"
namespace {
bool do_read(int fd, void* dst, size_t max, size_t* got) {
auto d = reinterpret_cast<char*>(dst);
size_t pos = 0;
while (true) {
auto ret = ::read(fd, d + pos, max - pos);
if (ret < 0) {
if (errno == EINTR) continue;
if (got && (errno == EAGAIN || errno == EWOULDBLOCK)) {
*got = pos;
return true;
}
return false;
}
if (ret == 0) {
if (got) {
*got = pos;
return true;
}
return false;
}
pos += ret;
if (got) {
*got = pos;
return true;
}
if (pos == max) {
return true;
}
}
}
bool do_write(int fd, void const* src, size_t size, size_t* wrote) {
auto s = reinterpret_cast<char const*>(src);
size_t pos = 0;
while (true) {
auto ret = ::write(fd, s + pos, size - pos);
if (ret < 0) {
if (errno == EINTR) continue;
if (wrote && (errno == EAGAIN || errno == EWOULDBLOCK)) {
*wrote = pos;
return true;
}
return false;
}
if (ret == 0) {
if (wrote) {
*wrote = pos;
return true;
}
return false;
}
pos += ret;
if (pos == size) {
if (wrote) *wrote = pos;
return true;
}
}
}
} // namespace
namespace io {
pipe::pipe() {
fd_[0] = fd_[1] = -1;
}
pipe::pipe(pipe&& pipe) {
fd_[0] = pipe.fd_[0];
fd_[1] = pipe.fd_[1];
pipe.fd_[0] = -1;
pipe.fd_[1] = -1;
}
pipe::~pipe() {
reset();
}
bool pipe::open() {
reset();
if (::pipe(fd_) == 0) return true;
fd_[0] = fd_[1] = -1;
return false;
}
void pipe::reset() {
if (fd_[0] == -1) return;
::close(fd_[0]);
::close(fd_[1]);
fd_[0] = fd_[1] = -1;
}
void pipe::swap(pipe& pipe) {
auto x = pipe.fd_[0];
pipe.fd_[0] = fd_[0];
fd_[0] = x;
x = pipe.fd_[1];
pipe.fd_[1] = fd_[1];
fd_[1] = x;
}
unique_fd::unique_fd()
: fd_(-1) {
}
unique_fd::unique_fd(int fd)
: fd_(fd) {
}
unique_fd::unique_fd(unique_fd&& fd)
: fd_(fd.release()) {
}
unique_fd::~unique_fd() {
reset();
}
void unique_fd::reset() {
if (fd_ == -1) return;
::close(fd_);
fd_ = -1;
}
void unique_fd::reset(int fd) {
if (fd_ == fd) return;
reset();
fd_ = fd;
}
void unique_fd::swap(unique_fd& fd) {
auto x = fd.fd_;
fd.fd_ = fd_;
fd_ = x;
}
int unique_fd::release() {
auto ret = fd_;
fd_ = -1;
return ret;
}
bool read(pipe const& pipe, void* dst, size_t max, size_t* got) {
return do_read(pipe.read(), dst, max, got);
}
bool write(pipe const& pipe, void const* src, size_t size, size_t* wrote) {
return do_write(pipe.write(), src, size, wrote);
}
bool read(unique_fd const& fd, void* dst, size_t max, size_t* got) {
return do_read(fd.get(), dst, max, got);
}
bool write(unique_fd const& fd, void const* src, size_t size, size_t* wrote) {
return do_write(fd.get(), src, size, wrote);
}
} // namespace io
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