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/*
* Copyright 2015 Andrew Ayer
*
* This file is part of git-crypt.
*
* git-crypt is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* git-crypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with git-crypt. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify the Program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, the licensors of the Program
* grant you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#include "coprocess.hpp"
#include "util.hpp"
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
static int execvp (const std::string& file, const std::vector<std::string>& args)
{
std::vector<const char*> args_c_str;
args_c_str.reserve(args.size());
for (std::vector<std::string>::const_iterator arg(args.begin()); arg != args.end(); ++arg) {
args_c_str.push_back(arg->c_str());
}
args_c_str.push_back(nullptr);
return execvp(file.c_str(), const_cast<char**>(&args_c_str[0]));
}
Coprocess::Coprocess ()
{
pid = -1;
stdin_pipe_reader = -1;
stdin_pipe_writer = -1;
stdin_pipe_ostream = nullptr;
stdout_pipe_reader = -1;
stdout_pipe_writer = -1;
stdout_pipe_istream = nullptr;
}
Coprocess::~Coprocess ()
{
close_stdin();
close_stdout();
}
std::ostream* Coprocess::stdin_pipe ()
{
if (!stdin_pipe_ostream) {
int fds[2];
if (pipe(fds) == -1) {
throw System_error("pipe", "", errno);
}
stdin_pipe_reader = fds[0];
stdin_pipe_writer = fds[1];
stdin_pipe_ostream = new ofhstream(this, write_stdin);
}
return stdin_pipe_ostream;
}
void Coprocess::close_stdin ()
{
delete stdin_pipe_ostream;
stdin_pipe_ostream = nullptr;
if (stdin_pipe_writer != -1) {
close(stdin_pipe_writer);
stdin_pipe_writer = -1;
}
if (stdin_pipe_reader != -1) {
close(stdin_pipe_reader);
stdin_pipe_reader = -1;
}
}
std::istream* Coprocess::stdout_pipe ()
{
if (!stdout_pipe_istream) {
int fds[2];
if (pipe(fds) == -1) {
throw System_error("pipe", "", errno);
}
stdout_pipe_reader = fds[0];
stdout_pipe_writer = fds[1];
stdout_pipe_istream = new ifhstream(this, read_stdout);
}
return stdout_pipe_istream;
}
void Coprocess::close_stdout ()
{
delete stdout_pipe_istream;
stdout_pipe_istream = nullptr;
if (stdout_pipe_writer != -1) {
close(stdout_pipe_writer);
stdout_pipe_writer = -1;
}
if (stdout_pipe_reader != -1) {
close(stdout_pipe_reader);
stdout_pipe_reader = -1;
}
}
void Coprocess::spawn (const std::vector<std::string>& args)
{
pid = fork();
if (pid == -1) {
throw System_error("fork", "", errno);
}
if (pid == 0) {
if (stdin_pipe_writer != -1) {
close(stdin_pipe_writer);
}
if (stdout_pipe_reader != -1) {
close(stdout_pipe_reader);
}
if (stdin_pipe_reader != -1) {
dup2(stdin_pipe_reader, 0);
close(stdin_pipe_reader);
}
if (stdout_pipe_writer != -1) {
dup2(stdout_pipe_writer, 1);
close(stdout_pipe_writer);
}
execvp(args[0], args);
perror(args[0].c_str());
_exit(-1);
}
if (stdin_pipe_reader != -1) {
close(stdin_pipe_reader);
stdin_pipe_reader = -1;
}
if (stdout_pipe_writer != -1) {
close(stdout_pipe_writer);
stdout_pipe_writer = -1;
}
}
int Coprocess::wait ()
{
int status = 0;
if (waitpid(pid, &status, 0) == -1) {
throw System_error("waitpid", "", errno);
}
return status;
}
size_t Coprocess::write_stdin (void* handle, const void* buf, size_t count)
{
const int fd = static_cast<Coprocess*>(handle)->stdin_pipe_writer;
ssize_t ret;
while ((ret = write(fd, buf, count)) == -1 && errno == EINTR); // restart if interrupted
if (ret < 0) {
throw System_error("write", "", errno);
}
return ret;
}
size_t Coprocess::read_stdout (void* handle, void* buf, size_t count)
{
const int fd = static_cast<Coprocess*>(handle)->stdout_pipe_reader;
ssize_t ret;
while ((ret = read(fd, buf, count)) == -1 && errno == EINTR); // restart if interrupted
if (ret < 0) {
throw System_error("read", "", errno);
}
return ret;
}
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