void jack_raw_output::stop ()
{
check_running ();
jack_deactivate (_client);
set_state (async_state::idle);
}
/* This function creates a lock file.
* Return values:
* TRUE: Successful.
* FALSE: The locker process died.
* -1: No permission to lock.
*/
static int
create_lock_file(char *lock_file,char *sn_host,char *sn_pid)
{
int fd;
char status_buf[500];
int status_len;
int write_ret;
/* It is importan, that the pid is expanded with 0
* because the zeros are space holders.
*/
sprintf(status_buf,"%s %s %7lu\n",
sn_pid,
sn_host,
(unsigned long)getpid());
status_len = strlen(status_buf);
while (!killed)
{
/* Check whether we can create the file! */
if ((fd = open(lock_file,O_RDWR|O_CREAT|O_EXCL,0666)) == -1)
{
if (errno == EINTR) /* Interrupted ? */
continue;
if (errno != EEXIST)
{ /* Even the file does not exist, it */
return -1; /* was not possible to create it. */
}
switch (check_running(lock_file))
{
case TRUE:
/* Lets try it again! */
#if TTY_TRACE
if (tty)
fprintf(tty,"trying %d\n",(int)getpid());
#endif /* TTY_TRACE */
sleep(1);
break;
case FALSE:
#if TTY_TRACE
if (tty)
fprintf(tty,"removing lock file %d\n",(int)getpid());
#endif /* TTY_TRACE */
unlink(lock_file);
break;
case -1: /* The locker process died. */
#if TTY_TRACE
if (tty)
fprintf(tty,"The locker process died.\n");
#endif /* TTY_TRACE */
return FALSE;
break;
}
continue;
}
/* We could create the file, now we write into it. */
write_ret = write(fd,status_buf,status_len);
if (write_ret == -1)
return -1;
if (write_ret == status_len)
{
char read_buf[1000];
lseek(fd,(off_t)0,SEEK_SET); /* Rewind ! */
if (read(fd,read_buf,sizeof(read_buf)) == status_len &&
memcmp(status_buf,read_buf,status_len) == 0)
{
close(fd);
#if TTY_TRACE
if (tty)
fprintf(tty,"Lock created %d.\n",(int)getpid());
#endif /* TTY_TRACE */
return TRUE; /* We read what we wrote. */
}
}
/* Lets try it again! */
#if TTY_TRACE
if (tty)
fprintf(tty,"Trying again %d...\n",(int)getpid());
#endif /* TTY_TRACE */
sleep(1);
}
return FALSE; /* Reached, only when killed. */
}
