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/*
* SystemBackendPosix.cpp
*
* Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "SystemBackendPosix.h"
#include <cstdlib>
#include <cstring>
#include <fcntl.h>
#include <signal.h>
#include <spawn.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sigc++/bind.h>
namespace Mad {
namespace Common {
namespace Backends {
SystemBackendPosix SystemBackendPosix::backend;
std::map<pid_t, sigc::slot<void, int> > SystemBackendPosix::processes;
std::map<pid_t, std::pair<sigc::slot<void, int, const std::string&>, int> > SystemBackendPosix::processesWithOutput;
void SystemBackendPosix::setChildHandler() {
struct sigaction action;
action.sa_handler = childHandler;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
sigaction(SIGCHLD, &action, 0);
}
SystemBackendPosix::~SystemBackendPosix() {
struct sigaction action;
action.sa_handler = SIG_DFL;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
sigaction(SIGCHLD, &action, 0);
}
void SystemBackendPosix::fsInfoCallback(int, const std::string &output, const sigc::slot<void, const std::vector<FSInfo>& > &callback) {
// TODO Process df output
callback(std::vector<FSInfo>());
}
bool SystemBackendPosix::fsInfo(const sigc::slot<void, const std::vector<FSInfo>& > &callback) {
std::vector<std::string> argv;
argv.push_back("/bin/df");
argv.push_back("-P");
argv.push_back("-k");
return execWithOutput(sigc::bind(sigc::mem_fun(this, &SystemBackendPosix::fsInfoCallback), callback), "/bin/df", argv);
}
void SystemBackendPosix::childHandler(int) {
int status;
pid_t pid;
while((pid = waitpid(-1, &status, WNOHANG)) > 0) {
std::map<pid_t, sigc::slot<void, int> >::iterator it = processes.find(pid);
if(it != processes.end()) {
it->second(status);
processes.erase(it);
}
else {
std::map<pid_t, std::pair<sigc::slot<void, int, const std::string&>, int> >::iterator it2 = processesWithOutput.find(pid);
if(it2 != processesWithOutput.end()) {
char buffer[1024];
ssize_t n;
std::string output;
while((n = read(it2->second.second, buffer, sizeof(buffer))) > 0)
output += std::string(buffer, n);
close(it2->second.second);
it2->second.first(status, output);
processesWithOutput.erase(it2);
}
}
}
setChildHandler();
}
std::pair<char**, char**> SystemBackendPosix::makeArgs(const std::string &filename, const std::vector<std::string> &argv, const std::vector<std::string> &env) {
char **argvp, **envp;
if(argv.empty()) {
argvp = new char*[2];
argvp[0] = strdup(filename.c_str());
argvp[1] = 0;
}
else {
argvp = new char*[argv.size() + 1];
for(size_t s = 0; s < argv.size(); ++s) {
argvp[s] = strdup(argv[s].c_str());
}
argvp[argv.size()] = 0;
}
if(env.empty()) {
envp = environ;
}
else {
envp = new char*[env.size() + 1];
for(size_t s = 0; s < env.size(); ++s) {
envp[0] = strdup(env[s].c_str());
}
envp[env.size()] = 0;
}
return std::make_pair(argvp, envp);
}
void SystemBackendPosix::destroyArgs(std::pair<char**, char**> args) {
for(char **p = args.first; *p != 0; ++p)
std::free(*p);
delete [] args.first;
if(args.second != environ) {
for(char **p = args.second; *p != 0; ++p)
std::free(*p);
delete [] args.second;
}
}
bool SystemBackendPosix::exec(const sigc::slot<void, int> &resultHandler, const std::string &filename, const std::vector<std::string> &argv, const std::vector<std::string> &env) {
pid_t pid;
std::pair<char**, char**> args = makeArgs(filename, argv, env);
sigset_t set, oldset;
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigprocmask(SIG_BLOCK, &set, &oldset);
bool ret = (posix_spawnp(&pid, filename.c_str(), 0, 0, args.first, args.second) == 0);
if(ret)
processes.insert(std::make_pair(pid, resultHandler));
sigprocmask(SIG_SETMASK, &oldset, 0);
destroyArgs(args);
return ret;
}
bool SystemBackendPosix::execWithOutput(const sigc::slot<void, int, const std::string&> &resultHandler, const std::string &filename, const std::vector<std::string> &argv, const std::vector<std::string> &env) {
pid_t pid;
std::pair<char**, char**> args = makeArgs(filename, argv, env);
int saveStdout = dup(STDOUT_FILENO);
int pipeHandles[2];
pipe(pipeHandles); // TODO Better pipe handling
fcntl(pipeHandles[0], F_SETFD, FD_CLOEXEC);
sigset_t set, oldset;
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigprocmask(SIG_BLOCK, &set, &oldset);
dup2(pipeHandles[1], STDOUT_FILENO); // set the new pipe as stdout
close(pipeHandles[1]);
bool ret = (posix_spawnp(&pid, filename.c_str(), 0, 0, args.first, args.second) == 0);
if(ret)
processesWithOutput.insert(std::make_pair(pid, std::make_pair(resultHandler, pipeHandles[0])));
dup2(saveStdout, STDOUT_FILENO); // restore old stdout
close(saveStdout);
sigprocmask(SIG_SETMASK, &oldset, 0);
destroyArgs(args);
return ret;
}
}
}
}
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