diff options
| -rw-r--r-- | src/server/publicServer.c | 113 |
1 files changed, 38 insertions, 75 deletions
diff --git a/src/server/publicServer.c b/src/server/publicServer.c index e52d8c6..01f65cb 100644 --- a/src/server/publicServer.c +++ b/src/server/publicServer.c @@ -58,98 +58,61 @@ char *public_server_get_setting(char *env, char *param, char *default_val) return getParamElse(param, server_configFile_get_value(env, default_val)); } -void daemonize() +/** + * Send the process to the background + */ +static void daemonize() { #ifndef __WIN32__ - int i, lockfd, ipid; - char pid[16]; - char spid[64]; + pid_t pid, sid; - ipid = getpid(); + FILE *pid_file; - /* detach if asked */ - if (ipid == 1) { - return; /* already a daemon */ - } - - /* fork to guarantee we are not process group leader */ - i = fork(); - - if (i < 0) { - exit(1); /* fork error */ - } else if (i > 0) { - exit(0); /* parent exits */ + /* are we already a daemon? */ + if (getppid() == 1) { + return; } - /* child (daemon) continues */ - setsid(); /* obtain a new process group */ - ipid = getpid() + 1; - - printf("The Tuxanci game server started with PID %d\n", ipid); - /* fork again so we become process group leader - * and cannot regain a controlling tty - */ - i = fork(); - - if (i < 0) { - exit(1); /* fork error */ - } else if (i > 0) { - exit(0); /* parent exits */ + /* fork off the parent process */ + pid = fork(); + if (pid < 0) { + exit(1); + /* if we got a good PID, then we can exit the parent process */ + } else if (pid > 0) { + exit(0); } - /* close all fds (descriptors) */ - for (i = getdtablesize(); i >= 0; --i) { - close(i); - } + /* ↓ at this point we are executing as the child process ↓ */ - /* close parent fds and send output to fds 0, 1 and 2 to bitbucket */ - i = open("/dev/null", O_RDWR); + /* change the file mode mask */ + umask(027); - if (i < 0) { + /* create a new SID for the child process */ + sid = setsid(); + if (sid < 0) { exit(1); } - dup(i); - dup(i); /* handle standard I/O */ - - sprintf(spid, public_server_get_setting("PID_FILE", "--pid-file", "/tmp/tuxanci-server.pid")); - - /* create local lock */ - lockfd = open(spid, O_RDWR | O_CREAT, 0640); - - if (lockfd < 0) { - perror("[Error] Lock: open\n"); + /* Change the current working directory. This prevents the current + * directory from being locked; hence not being able to remove it. + * /tmp seems to be the best place where to create temporary files ;c) + */ + if (chdir("/tmp") < 0) { exit(1); } - #ifndef __CYGWIN__ - /* lock the file */ - if (lockf(lockfd, F_TLOCK, 0) < 0) { - error("Lock: lockf"); - warning("The Tuxanci game server is already running"); - exit(0); - } - #else /* __CYGWIN__ */ - /* lock the file */ - { - struct flock lock; - lock.l_type = F_RDLCK; - lock.l_start = 0; - lock.l_whence = SEEK_SET; - lock.l_len = 0; - - if (fcntl(lockfd, F_SETLK, &lock) < 0) { - warning("The Tuxanci game server is already running"); - exit(0); - } - } - #endif /* __CYGWIN__ */ - /* write to pid to lockfile */ - snprintf(pid, 16, "%d\n", getpid()); - write(lockfd, pid, strlen(pid)); + /* say loudly what PID we got */ + printf("The Tuxanci game server started with the PID %d\n", sid); - /* restrict created files to 0750 */ - umask(027); + /* write the PID to the PID file */ + pid_file = fopen(public_server_get_setting("PID_FILE", "--pid-file", "/var/run/tuxanci-server.pid"), "w"); + fprintf(pid_file, "%d\n", sid); + fclose(pid_file); + + /* redirect standard files to /dev/null */ + freopen("/dev/null", "r", stdin); + freopen("/dev/null", "w", stdout); + freopen("/dev/null", "w", stderr); #endif /* __WIN32__ */ } |