libcryfs/daemon/daemonize.cpp

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#include "daemonize.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <iostream>
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#include "../logging/logging.h"
using namespace cpputils::logging;
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namespace cpputils {
//TODO Test daemonize()
void daemonize() {
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pid_t pid = fork();
if (pid < 0) {
exit(EXIT_FAILURE);
}
if (pid > 0) {
//We're the parent process. Exit.
exit(EXIT_SUCCESS);
}
// We're the child process.
umask(0);
// Create a new SID for the child process
pid_t sid = setsid();
if (sid < 0) {
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LOG(ERROR) << "Failed to get SID for daemon process";
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exit(EXIT_FAILURE);
}
// Change the current working directory to a directory that's always existin
if ((chdir("/")) < 0) {
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LOG(ERROR) << "Failed to change working directory for daemon process";
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exit(EXIT_FAILURE);
}
// Close out the standard file descriptors. The daemon can't use them anyhow.
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
};
}