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process.cc
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process.cc
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#include <process.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/wait.h>
#include <signal.h>
#include <iostream>
using namespace std;
namespace process {
volatile sig_atomic_t childExitStatus = 0;
pair<std::string, std::string> split(const std::string& str) {
size_t length = str.length();
size_t midpoint = length / 2;
std::string firstHalf = str.substr(0, midpoint);
std::string secondHalf = str.substr(midpoint);
return make_pair(firstHalf, secondHalf);
}
void sigchld_handler(int signo) {
(void)signo;
int status;
while (waitpid(-1, &status, WNOHANG) > 0) {
childExitStatus = status;
}
}
void Runner::New(const std::string &name, const std::string &logPath) {
std::string stdoutFileName = logPath + "/" + name + "-out.log";
std::string stderrFileName = logPath + "/" + name + "-error.log";
stdout_fd = open(stdoutFileName.c_str(), O_WRONLY | O_CREAT | O_APPEND, 0644);
stderr_fd = open(stderrFileName.c_str(), O_WRONLY | O_CREAT | O_APPEND, 0644);
struct sigaction sa;
sa.sa_handler = sigchld_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
if (sigaction(SIGCHLD, &sa, NULL) == -1) {
std::cerr << "[PMC] (cc) Error setting up SIGCHLD handler\n";
}
}
Runner::~Runner() {
if (stdout_fd != -1) {
close(stdout_fd);
}
if (stderr_fd != -1) {
close(stderr_fd);
}
}
int64_t Runner::Run(const std::string &command, const std::string &shell, Vec<String> args) {
pid_t pid = fork();
if (pid == -1) {
std::cerr << "[PMC] (cc) Unable to fork\n";
return -1;
} else if (pid == 0) {
setsid();
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
dup2(stdout_fd, STDOUT_FILENO);
dup2(stderr_fd, STDERR_FILENO);
std::vector<const char*> argsArray;
argsArray.push_back(shell.c_str());
transform(args.begin(), args.end(), std::back_inserter(argsArray),
[](rust::String& arg) { return arg.c_str(); });
argsArray.push_back(command.c_str());
argsArray.push_back((char *)nullptr);
if (execvp(shell.c_str(), const_cast<char* const*>(argsArray.data())) == -1) {
std::cerr << "[PMC] (cc) Unable to execute the command\n";
exit(EXIT_FAILURE);
}
} else {
close(stdout_fd);
close(stderr_fd);
return pid;
}
return -1;
}}

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