mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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145 lines
3 KiB
C++
145 lines
3 KiB
C++
/** Bi-directional popen
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLAScommon
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <paths.h>
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#include <dirent.h>
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#include <villas/exceptions.hpp>
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#include <villas/popen.hpp>
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namespace villas {
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namespace utils {
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Popen::Popen(const std::string &cmd) :
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command(cmd)
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{
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open();
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}
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Popen::~Popen()
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{
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close();
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}
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void Popen::kill(int signal)
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{
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::kill(pid, signal);
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}
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void Popen::open()
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{
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const int READ = 0;
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const int WRITE = 1;
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int ret;
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int inpipe[2];
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int outpipe[2];
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char *argv[4];
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ret = pipe(inpipe);
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if (ret)
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goto error_out;
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ret = pipe(outpipe);
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if (ret)
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goto clean_inpipe_out;
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input.buffer = std::make_unique<stdio_buf>(outpipe[READ], std::ios_base::in);
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output.buffer = std::make_unique<stdio_buf>(inpipe[WRITE], std::ios_base::out);
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input.stream = std::make_unique<std::istream>(input.buffer.get());
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output.stream = std::make_unique<std::ostream>(output.buffer.get());
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pid = fork();
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if (pid == -1)
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goto clean_outpipe_out;
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if (pid == 0) {
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::close(outpipe[READ]);
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::close(inpipe[WRITE]);
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if (inpipe[READ] != STDIN_FILENO) {
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dup2(inpipe[READ], STDIN_FILENO);
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::close(inpipe[READ]);
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}
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if (outpipe[WRITE] != STDOUT_FILENO) {
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dup2(outpipe[WRITE], STDOUT_FILENO);
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::close(outpipe[WRITE]);
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}
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argv[0] = (char *) "sh";
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argv[1] = (char *) "-c";
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argv[2] = (char *) command.c_str();
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argv[3] = nullptr;
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execv(_PATH_BSHELL, (char * const *) argv);
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exit(127);
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}
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::close(outpipe[WRITE]);
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::close(inpipe[READ]);
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return;
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clean_outpipe_out:
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::close(outpipe[READ]);
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::close(outpipe[WRITE]);
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clean_inpipe_out:
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::close(inpipe[READ]);
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::close(inpipe[WRITE]);
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error_out:
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throw SystemError("Failed to start subprocess");
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}
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int Popen::close()
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{
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int pstat;
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if (pid != -1) {
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do {
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pid = waitpid(pid, &pstat, 0);
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} while (pid == -1 && errno == EINTR);
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}
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input.stream.reset();
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output.stream.reset();
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input.buffer.reset();
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output.buffer.reset();
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return pid == -1 ? -1 : pstat;
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}
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} /* namespace utils */
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} /* namespace villas */
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