/*
* Deal with signals.
*
* LOCKING: acquires and releases configlock.
*/
void *
signal_thread(void *arg)
{
int err, signo;
for (;;) {
err = sigwait(&mask, &signo);
if (err != 0)
log_quit("sigwait failed: %s", strerror(err));
switch (signo) {
case SIGHUP:
/*
* Schedule to re-read the configuration file.
*/
pthread_mutex_lock(&configlock);
reread = 1;
pthread_mutex_unlock(&configlock);
break;
case SIGTERM:
kill_workers();
log_msg("terminate with signal %s", strsignal(signo));
exit(0);
default:
kill_workers();
log_quit("unexpected signal %d", signo);
}
}
}
int
dial_next(Dialers *dialptr) /* pointers in structure are filled in */
{
if (fpdial == NULL) {
if ( (fpdial = fopen(DIALERS, "r")) == NULL)
log_sys("can't open %s", DIALERS);
diallineno = 0;
}
again:
if (fgets(dialline, MAXLINE, fpdial) == NULL)
return(-1); /* EOF */
diallineno++;
if ( (dialptr->dialer = strtok(dialline, WHITE)) == NULL) {
if (dialline[0] == '\n')
goto again; /* ignore empty line */
log_quit("missing `dialer' in Dialers file, line %d", diallineno);
}
if (dialptr->dialer[0] == '#')
goto again; /* ignore comment line */
if ( (dialptr->sub = strtok(NULL, WHITE)) == NULL)
log_quit("missing `sub' in Dialers file, line %d", diallineno);
if ( (dialptr->expsend = strtok(NULL, "\n")) == NULL)
log_quit("missing `expsend' in Dialers file, line %d", diallineno);
return(0);
}
int
main(int argc, char *argv[])
{
int c;
log_open("calld", LOG_PID, LOG_USER);
opterr = 0; /* don't want getopt() writing to stderr */
while ((c = getopt(argc, argv, "d")) != EOF) {
switch (c) {
case 'd': /* debug */
log_to_stderr = 1;
break;
case '?':
log_quit("unrecognized option: -%c", optopt);
}
}
if (log_to_stderr == 0)
daemonize("calld");
loop(); /* never returns */
return 0;
}
int
scheduler_init()
{
if(g_read_fd != CLEARED_SOCKET)
{
return -2;
}
/* convention : 0: read 1: write */
int sv[2];
if(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == -1)
{
int err = ERRNO_ERROR;
log_quit("scheduler: socketpair error %r", err);
return err;
}
g_read_fd = sv[0];
g_write_fd = sv[1];
threaded_queue_init(&scheduler_queue, SCHEDULER_MAX_TASKS);
return g_read_fd;
}
void ed_quit(Context_t *ctx)
{
buf_free(ctx->c_buffer);
buf_free(ctx->cmd_buffer);
ncs_close(ctx->scr);
ncs_quit();
log_quit();
}
void
client_sigchld(pid_t pid, int stat)
{
int i;
for (i = 0; i < client_size; i++) {
if (client[i].pid == pid) {
client[i].childdone = stat; /* child's exit() status +1 */
return;
}
}
log_quit("can't find client entry for pid %d", pid);
}
void
client_del(int fd)
{
int i;
for (i = 0; i < client_size; i++) {
if (client[i].fd == fd) {
client[i].fd = -1;
return;
}
}
log_quit("can't find client entry for fd %d", fd);
}
void
scheduler_process()
{
scheduler_packet *packet;
if(g_read_fd < 0)
{
return;
}
MALLOC_OR_DIE(scheduler_packet*, packet, sizeof (scheduler_packet), SCHDPAKT_TAG);
int len = SCHEDULER_PACKET_LEN;
u8* p = (u8*)packet;
do
{
int n = read(g_read_fd, p, len);
if(n < 0)
{
int err = errno;
if(err == EINTR)
{
continue;
}
log_quit("scheduler: read error: %r", ERRNO_ERROR);
free(packet);
return;
}
len -= n;
p += n;
}
while(len > 0);
/* packet is the native-order pointer to the scheduler_task to add to the queue */
threaded_queue_enqueue(&scheduler_queue, packet);
}
void
scheduler_schedule_task(scheduler_task_callback* function, void* args)
{
scheduler_packet packet;
u8* p = (u8*) & packet;
ssize_t len = sizeof (scheduler_packet);
ssize_t n;
/*
#ifndef NDEBUG
log_debug("scheduler: scheduler_schedule_task(%P,%p)'", function, args);
#endif
*/
packet.task = function;
packet.args = args;
if(g_write_fd < 0)
{
return;
}
do
{
n = write(g_write_fd, p, len);
if(n <= 0)
{
int err = errno;
if(err == EINTR)
{
continue;
}
log_quit("scheduler: write error: %r", err, ERRNO_ERROR);
break;
}
len -= n;
p += n;
}
while(len > 0);
}
/*
* Initialize the job ID file. Use a record lock to prevent
* more than one printer daemon from running at a time.
*
* LOCKING: none, except for record-lock on job ID file.
*/
void init_request(void)
{
int n;
char name[FILENMSZ];
sprintf(name, "%s/%s", SPOOLDIR, JOBFILE);
jobfd = open(name, O_CREAT|O_RDWR, S_IRUSR|S_IWUSR);
if (write_lock(jobfd, 0, SEEK_SET, 0) < 0)
log_quit("daemon already running");
/*
* Reuse the name buffer for the job counter.
*/
if ((n = read(jobfd, name, FILENMSZ)) < 0)
log_sys("can't read job file");
if (n == 0)
nextjob = 1;
else
nextjob = atol(name);
}
int main(int argc, char *argv[])
{
int err;
pthread_t tid;
struct sigaction sa;
char *cmd;
if(NULL == (cmd = strrchr(argv[0], '/')))
cmd = argv[0];
else
cmd ++;
syslog(LOG_ERR, "main thread id is %u.\n", (unsigned)pthread_self());
// daemonize(cmd);
daemon(0, 0);
if(already_running())
{
syslog(LOG_ERR, "xdaemon already running.\n");
exit(1);
}
syslog(LOG_ERR, "main thread 2 id is %u.\n", (unsigned)pthread_self());
// /*
sa.sa_handler = SIG_DFL;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if(sigaction(SIGHUP, &sa, NULL) < 0)
log_quit("can't restore SIGHUP default");
sigfillset(&mask);
if((err = pthread_sigmask(SIG_BLOCK, &mask, NULL)) != 0)
log_exit(err, "SIG_BLOCK error");
err = pthread_create(&tid, NULL, thread_func, 0);
if(err != 0)
log_exit(err, "can't create thread");
//*/
test_func();
exit(0);
}
/*
* Main print server thread. Accepts connect requests from
* clients and spawns additional threads to service requests.
*
* LOCKING: none.
*/
int
main(int argc, char *argv[])
{
pthread_t tid;
struct addrinfo *ailist, *aip;
int sockfd, err, i, n, maxfd;
char *host;
fd_set rendezvous, rset;
struct sigaction sa;
struct passwd *pwdp;
if (argc != 1)
err_quit("usage: printd");
daemonize("printd");
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &sa, NULL) < 0)
log_sys("sigaction failed");
sigemptyset(&mask);
sigaddset(&mask, SIGHUP);
sigaddset(&mask, SIGTERM);
if ((err = pthread_sigmask(SIG_BLOCK, &mask, NULL)) != 0)
log_sys("pthread_sigmask failed");
n = sysconf(_SC_HOST_NAME_MAX);
if (n < 0) /* best guess */
n = HOST_NAME_MAX;
if ((host = malloc(n)) == NULL)
log_sys("malloc error");
if (gethostname(host, n) < 0)
log_sys("gethostname error");
if ((err = getaddrlist(host, "print", &ailist)) != 0) {
log_quit("getaddrinfo error: %s", gai_strerror(err));
exit(1);
}
FD_ZERO(&rendezvous);
maxfd = -1;
for (aip = ailist; aip != NULL; aip = aip->ai_next) {
if ((sockfd = initserver(SOCK_STREAM, aip->ai_addr,
aip->ai_addrlen, QLEN)) >= 0) {
FD_SET(sockfd, &rendezvous);
if (sockfd > maxfd)
maxfd = sockfd;
}
}
if (maxfd == -1)
log_quit("service not enabled");
pwdp = getpwnam(LPNAME);
if (pwdp == NULL)
log_sys("can't find user %s", LPNAME);
if (pwdp->pw_uid == 0)
log_quit("user %s is privileged", LPNAME);
if (setgid(pwdp->pw_gid) < 0 || setuid(pwdp->pw_uid) < 0)
log_sys("can't change IDs to user %s", LPNAME);
init_request();
init_printer();
err = pthread_create(&tid, NULL, printer_thread, NULL);
if (err == 0)
err = pthread_create(&tid, NULL, signal_thread, NULL);
if (err != 0)
log_exit(err, "can't create thread");
build_qonstart();
log_msg("daemon initialized");
for (;;) {
rset = rendezvous;
if (select(maxfd+1, &rset, NULL, NULL, NULL) < 0)
log_sys("select failed");
for (i = 0; i <= maxfd; i++) {
if (FD_ISSET(i, &rset)) {
/*
* Accept the connection and handle the request.
*/
if ((sockfd = accept(i, NULL, NULL)) < 0)
log_ret("accept failed");
pthread_create(&tid, NULL, client_thread,
(void *)((long)sockfd));
}
}
}
exit(1);
}
void daemonize(const char *cmd)
{
int i, fd0, fd1, fd2;
pid_t pid;
struct rlimit rl;
struct sigaction sa;
/*
* Clear file creation mask.
*/
umask(0);
/*
* Get maximum number of file descriptors.
*/
if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
log_quit("%s:cannot get file limit", cmd);
/*
* Become a session leader tro lose controlling TTY.
*/
if ((pid = fork()) < 0)
log_quit("%s:cannot fork", cmd);
else if(pid != 0) /* parent */
exit(0);
setsid();
/*
* Ensure future opens won't allocate controlling TTYs.
*/
sa.sa_handler = SIG_IGN;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if(sigaction(SIGHUP, &sa, NULL) < 0)
log_quit("%s:cannot igore SIGHUP", cmd);
if((pid = fork()) < 0)
log_quit("%s:cannot fork", cmd);
else if(pid != 0) /* parent */
exit(0);
/*
* Change the current working directory to the root so
* we won't jprevernt file systems from being unmounted
*/
if(chdir("/") < 0)
log_quit("%s:can't chare dirctory to /", cmd);
/*
* Close all open file descriptions
*/
if(rl.rlim_max == RLIM_INFINITY)
rl.rlim_max = 1024;
for(i = 0; i < rl.rlim_max; i++)
close(i);
/*
* Attach file descriptions 0, 1, and 2 to /dev/null.
*/
fd0 = open("/dev/null", O_RDWR);
fd1 = dup(0);
fd2 = dup(0);
/*
*Initialize the log file.
*/
openlog(cmd, LOG_CONS, LOG_DAEMON);
if(fd0 != 0 || fd1 != 1 || fd2 != 2)
{
syslog(LOG_ERR, "unexpected file descriptors %d %d %d", fd0, fd1, fd2);
exit(1);
}
}
