static int
initialize_session_( uint index )
{
kernel_vars_t *kv;
ulong kv_phys;
if( g_sesstab->magic == 1 )
return -EMOLSECURITY;
/* printk("initialize_session\n" ); */
if( g_sesstab->kvars[index] )
return -EMOLINUSE;
if( !g_num_sessions && perform_actions() )
return -EMOLGENERAL;
if( !(kv=alloc_kvar_pages()) )
goto error;
memset( kv, 0, NUM_KVARS_PAGES * 0x1000 );
kv->session_index = index;
kv->kvars_virt = kv;
kv_phys = tophys_mol(kv);
kv->kvars_tophys_offs = kv_phys - (ulong)kv;
if( init_mmu(kv) )
goto error;
init_host_irqs(kv);
initialize_spr_table( kv );
msr_altered( kv );
g_num_sessions++;
g_sesstab->kvars_ph[index] = kv_phys;
g_sesstab->kvars[index] = kv;
return 0;
error:
if( !g_num_sessions )
cleanup_actions();
if( kv )
free_kvar_pages( kv );
return -EMOLGENERAL;
}
void
destroy_session( uint index )
{
kernel_vars_t *kv;
if( index >= MAX_NUM_SESSIONS )
return;
if( g_sesstab->magic == 1 ) {
printk("Security alert! Somebody other than MOL has tried to invoke\n"
"the MOL switch magic. The MOL infrastructure has been disabled.\n"
"Reboot in order to get MOL running again\n");
/* make it impossible to unload the module */
prevent_mod_unload();
}
SESSION_LOCK;
if( (kv=g_sesstab->kvars[index]) ) {
g_sesstab->kvars[index] = NULL;
g_sesstab->kvars_ph[index] = 0;
/* decrease before freeing anything (simplifies deallocation of shared resources) */
g_num_sessions--;
cleanup_host_irqs(kv);
cleanup_mmu( kv );
if( kv->emuaccel_page )
free_page_mol( kv->emuaccel_page );
memset( kv, 0, NUM_KVARS_PAGES * 0x1000 );
free_kvar_pages( kv );
if( !g_num_sessions )
cleanup_actions();
}
SESSION_UNLOCK;
}
int main(int argc, char **argv)
{
int c, i, retval;
int option = LOG_NDELAY;
pid_t pid, sid;
size_t argv0_len, procname_len, max_procname_len;
progname = argv[0];
shm_common_init();
while (1) {
int option_index = 0;
int curind = optind;
c = getopt_long (argc, argv, "hI:sFf:i:S",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'F':
foreground++;
break;
case 'I':
rtapi_instance = atoi(optarg);
break;
case 'R':
hal_thread_stack_size = atoi(optarg);
break;
case 'i':
instance_name = optarg;
break;
case 'f':
if ((flavor = flavor_byname(optarg)) == NULL) {
fprintf(stderr, "no such flavor: '%s' -- valid flavors are:\n", optarg);
flavor_ptr f = flavors;
while (f->name) {
fprintf(stderr, "\t%s\n", f->name);
f++;
}
exit(1);
}
break;
case 'u':
usr_msglevel = atoi(optarg);
break;
case 'r':
rt_msglevel = atoi(optarg);
break;
case 'H':
halsize = atoi(optarg);
break;
case 'S':
use_shmdrv++;
break;
case 's':
log_stderr++;
option |= LOG_PERROR;
break;
case '?':
if (optopt) fprintf(stderr, "bad short opt '%c'\n", optopt);
else fprintf(stderr, "bad long opt \"%s\"\n", argv[curind]);
exit(1);
break;
default:
usage(argc, argv);
exit(0);
}
}
// sanity
if (getuid() == 0) {
fprintf(stderr, "%s: FATAL - will not run as root\n", progname);
exit(EXIT_FAILURE);
}
if (geteuid() == 0) {
fprintf(stderr, "%s: FATAL - will not run as setuid root\n", progname);
exit(EXIT_FAILURE);
}
if (flavor == NULL)
flavor = default_flavor();
if (flavor == NULL) {
fprintf(stderr, "%s: FATAL - failed to detect thread flavor\n", progname);
exit(EXIT_FAILURE);
}
// can we actually run what's being suggested?
if (!flavor_and_kernel_compatible(flavor)) {
fprintf(stderr, "%s: FATAL - cant run the %s flavor on this kernel\n",
progname, flavor->name);
exit(EXIT_FAILURE);
}
// catch installation error: user not in xenomai group
if (flavor->id == RTAPI_XENOMAI_ID) {
int retval = user_in_xenomai_group();
switch (retval) {
case 1: // yes
break;
case 0:
fprintf(stderr, "this user is not member of group xenomai\n");
fprintf(stderr, "please 'sudo adduser <username> xenomai',"
" logout and login again\n");
exit(EXIT_FAILURE);
default:
fprintf(stderr, "cannot determine if this user "
"is a member of group xenomai: %s\n",
strerror(-retval));
exit(EXIT_FAILURE);
}
}
// do we need the shmdrv module?
if (((flavor->flags & FLAVOR_KERNEL_BUILD) ||
use_shmdrv) &&
!shmdrv_available()) {
fprintf(stderr, "%s: FATAL - %s requires the shmdrv module loaded\n",
progname, use_shmdrv ? "--shmdrv" : flavor->name);
exit(EXIT_FAILURE);
}
// the global segment every entity in HAL/RTAPI land attaches to
if ((retval = create_global_segment()) != 1) // must be a new shm segment
exit(retval);
// good to go
if (!foreground) {
pid = fork();
if (pid < 0) {
exit(EXIT_FAILURE);
}
if (pid > 0) {
exit(EXIT_SUCCESS);
}
umask(0);
sid = setsid();
if (sid < 0) {
exit(EXIT_FAILURE);
}
#if 0
if ((chdir("/")) < 0) {
exit(EXIT_FAILURE);
}
#endif
}
snprintf(proctitle, sizeof(proctitle), "msgd:%d",rtapi_instance);
openlog_async(proctitle, option , SYSLOG_FACILITY);
// set new process name
argv0_len = strlen(argv[0]);
procname_len = strlen(proctitle);
max_procname_len = (argv0_len > procname_len) ? (procname_len) : (argv0_len);
strncpy(argv[0], proctitle, max_procname_len);
memset(&argv[0][max_procname_len], '\0', argv0_len - max_procname_len);
for (i = 1; i < argc; i++)
memset(argv[i], '\0', strlen(argv[i]));
// this is the single place in all of linuxCNC where the global segment
// gets initialized - no reinitialization from elsewhere
init_global_data(global_data, flavor->id, rtapi_instance,
halsize, rt_msglevel, usr_msglevel,
instance_name,hal_thread_stack_size);
syslog_async(LOG_INFO,
"startup instance=%s pid=%d flavor=%s "
"rtlevel=%d usrlevel=%d halsize=%d shm=%s gcc=%s version=%s",
global_data->instance_name, getpid(),
flavor->name,
global_data->rt_msg_level,
global_data->user_msg_level,
global_data->hal_size,
shmdrv_loaded ? "shmdrv" : "Posix",
__VERSION__,
GIT_VERSION);
syslog_async(LOG_INFO,"configured: %s sha=%s", CONFIG_DATE, GIT_CONFIG_SHA);
syslog_async(LOG_INFO,"built: %s %s sha=%s", __DATE__, __TIME__, GIT_BUILD_SHA);
if (strcmp(GIT_CONFIG_SHA,GIT_BUILD_SHA))
syslog_async(LOG_WARNING, "WARNING: git SHA's for configure and build do not match!");
if ((global_data->rtapi_msgd_pid != 0) &&
kill(global_data->rtapi_msgd_pid, 0) == 0) {
fprintf(stderr,"%s: another rtapi_msgd is already running (pid %d), exiting\n",
progname, global_data->rtapi_msgd_pid);
exit(EXIT_FAILURE);
} else {
global_data->rtapi_msgd_pid = getpid();
}
close(STDIN_FILENO);
close(STDOUT_FILENO);
if (!log_stderr)
close(STDERR_FILENO);
message_thread();
// signal received - check if rtapi_app running, and shut it down
cleanup_actions();
closelog_async();
exit(exit_code);
}
