pid_t
sys_waitpid(pid_t pid, int * status, int options, int *retval){
int result = valid_pid(pid);
if(result){
return result;
}
//If there is an option attached, FAIL. NO OPTIONS FOR YOU
else if(options != 0){
return EINVAL;
}
//If pointer is not aligned, throw an error. NO EXIT CODE FOR YOU
else if((int)status%4 != 0){
return EFAULT;
}
acquire_lock(pid);
//While the process has not exited yet,
while(has_exit_code(pid) == false){
put_to_sleep(pid);
}
*status = _MKWAIT_EXIT(get_exit_code(pid));
release_lock(pid);
release_pid(pid);
*retval = pid;
return 0;
}
/* Initialize the server - return fd of the listening socket or -1 on error */
void server_init (int debugging, int foreground)
{
struct sockaddr_un sock_name;
pid_t pid;
logit ("Starting MOC Server");
assert (server_sock == -1);
pid = check_pid_file ();
if (pid && valid_pid(pid)) {
fprintf (stderr, "\nIt seems that the server is already running"
" with pid %d.\n", pid);
fprintf (stderr, "If it is not true, remove the pid file (%s)"
" and try again.\n",
create_file_name(PID_FILE));
fatal ("Exiting!");
}
if (foreground)
log_init_stream (stdout, "stdout");
else {
FILE *logfp;
logfp = NULL;
if (debugging) {
logfp = fopen (SERVER_LOG, "a");
if (!logfp)
fatal ("Can't open server log file: %s", xstrerror (errno));
}
log_init_stream (logfp, SERVER_LOG);
}
if (pipe(wake_up_pipe) < 0)
fatal ("pipe() failed: %s", xstrerror (errno));
unlink (socket_name());
/* Create a socket.
* For reasons why AF_UNIX is the correct constant to use in both
* cases, see the commentary the SVN log for commit r9999. */
server_sock = socket (AF_UNIX, SOCK_STREAM, 0);
if (server_sock == -1)
fatal ("Can't create socket: %s", xstrerror (errno));
sock_name.sun_family = AF_UNIX;
strcpy (sock_name.sun_path, socket_name());
/* Bind to socket */
if (bind(server_sock, (struct sockaddr *)&sock_name, SUN_LEN(&sock_name)) == -1)
fatal ("Can't bind() to the socket: %s", xstrerror (errno));
if (listen(server_sock, 1) == -1)
fatal ("listen() failed: %s", xstrerror (errno));
/* Log stack sizes so stack overflows can be debugged. */
log_process_stack_size ();
log_pthread_stack_size ();
clients_init ();
audio_initialize ();
tags_cache = tags_cache_new (options_get_int("TagsCacheSize"));
tags_cache_load (tags_cache, create_file_name("cache"));
server_tid = pthread_self ();
xsignal (SIGTERM, sig_exit);
xsignal (SIGINT, foreground ? sig_exit : SIG_IGN);
xsignal (SIGHUP, SIG_IGN);
xsignal (SIGQUIT, sig_exit);
xsignal (SIGPIPE, SIG_IGN);
xsignal (SIGCHLD, sig_chld);
write_pid_file ();
if (!foreground) {
setsid ();
redirect_output (stdin);
redirect_output (stdout);
redirect_output (stderr);
}
return;
}
/* Initialize the server - return fd of the listening socket or -1 on error */
int server_init (int debugging, int foreground)
{
struct sockaddr_un sock_name;
int server_sock;
int pid;
logit ("Starting MOC Server");
pid = check_pid_file ();
if (pid && valid_pid(pid)) {
fprintf (stderr, "\nIt seems that the server is already running"
" with pid %d.\n", pid);
fprintf (stderr, "If it is not true, remove the pid file (%s)"
" and try again.\n",
create_file_name(PID_FILE));
fatal ("Exiting!");
}
if (foreground)
log_init_stream (stdout, "stdout");
else {
FILE *logfp;
logfp = NULL;
if (debugging) {
logfp = fopen (SERVER_LOG, "a");
if (!logfp)
fatal ("Can't open server log file: %s", strerror (errno));
}
log_init_stream (logfp, SERVER_LOG);
}
if (pipe(wake_up_pipe) < 0)
fatal ("pipe() failed: %s", strerror(errno));
unlink (socket_name());
/* Create a socket */
if ((server_sock = socket (PF_LOCAL, SOCK_STREAM, 0)) == -1)
fatal ("Can't create socket: %s", strerror(errno));
sock_name.sun_family = AF_LOCAL;
strcpy (sock_name.sun_path, socket_name());
/* Bind to socket */
if (bind(server_sock, (struct sockaddr *)&sock_name, SUN_LEN(&sock_name)) == -1)
fatal ("Can't bind() to the socket: %s", strerror(errno));
if (listen(server_sock, 1) == -1)
fatal ("listen() failed: %s", strerror(errno));
audio_initialize ();
tags_cache_init (&tags_cache, options_get_int("TagsCacheSize"));
tags_cache_load (&tags_cache, create_file_name("cache"));
clients_init ();
server_tid = pthread_self ();
thread_signal (SIGTERM, sig_exit);
thread_signal (SIGINT, foreground ? sig_exit : SIG_IGN);
thread_signal (SIGHUP, SIG_IGN);
thread_signal (SIGQUIT, sig_exit);
thread_signal (SIGPIPE, SIG_IGN);
write_pid_file ();
if (!foreground) {
setsid ();
redirect_output (stdin);
redirect_output (stdout);
redirect_output (stderr);
}
return server_sock;
}
