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67 lines
1.5 KiB
67 lines
1.5 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "utils.h"
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void FATAL(const char *msg) {
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fprintf(stderr, "%s", msg);
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exit(-1);
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}
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void usage() {
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printf("usage: ss -s server_host -p server_port -l local_port\n");
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printf(" -k password [-m encrypt_method] [-f pid_file]\n");
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printf("\n");
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printf("options:\n");
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printf(" encrypt_method: table, rc4\n");
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printf(" pid_file: valid path to the pid file\n");
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}
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void demonize(const char* path) {
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/* Our process ID and Session ID */
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pid_t pid, sid;
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/* Fork off the parent process */
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pid = fork();
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if (pid < 0) {
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exit(EXIT_FAILURE);
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}
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/* If we got a good PID, then
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we can exit the parent process. */
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if (pid > 0) {
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FILE *file = fopen(path, "w");
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if (file == NULL) FATAL("Invalid pid file\n");
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fprintf(file, "%d", pid);
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fclose(file);
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exit(EXIT_SUCCESS);
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}
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/* Change the file mode mask */
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umask(0);
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/* Open any logs here */
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/* Create a new SID for the child process */
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sid = setsid();
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if (sid < 0) {
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/* Log the failure */
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exit(EXIT_FAILURE);
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}
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/* Change the current working directory */
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if ((chdir("/")) < 0) {
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/* Log the failure */
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exit(EXIT_FAILURE);
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}
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/* Close out the standard file descriptors */
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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}
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