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/*
*
* Copyright (c) International Business Machines Corp., 2001
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Module: devnode_fixup.c
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <getopt.h>
#include <libgen.h>
#include <string.h>
#include <semaphore.h>
#include <signal.h>
#include <frontend.h>
static char * cmd = NULL;
static evms_verbose_level_t verbose_level = ERRORS_ONLY;
static BOOLEAN daemon_mode = FALSE;
static sem_t daemon_sem;
static BOOLEAN daemon_running = FALSE;
static void sigcont_handler (int signo) {
/* Safety check */
if (signo == SIGCONT) {
sem_post(&daemon_sem);
}
}
void show_help(void) {
printf("Usage: %s [option]\n", cmd);
printf("Update the EVMS device node tree.\n\n");
printf(" -d, --daemon run in daemon mode\n");
printf(" -v, --verbose display errors and informational messages\n");
printf(" -q --quiet display no messages\n");
printf(" -h, -? --help display this help\n\n");
}
static int parse_options(int argc, char * * argv) {
int rc = 0;
int c;
char * short_opts = "dvqh?";
struct option long_opts[] = {
{ "deamon", no_argument, NULL, 'd'},
{ "verbose", no_argument, NULL, 'v'},
{ "quiet", no_argument, NULL, 'q'},
{ "help", no_argument, NULL, 'h'},
{ NULL, 0, NULL, 0}
};
while ( (c = getopt_long(argc, argv,
short_opts, long_opts, NULL)) != EOF ) {
switch (c) {
case 'd':
daemon_mode = TRUE;
break;
case 'v':
if (verbose_level != NO_MESSAGES) {
verbose_level = ERRORS_AND_INFO;
} else {
printf("%s -- ERROR: cannot specify both quiet and verbose options.\n\n", cmd);
/* Display the help. */
rc = 1;
}
break;
case 'q':
if (verbose_level != ERRORS_AND_INFO) {
verbose_level = NO_MESSAGES;
} else {
printf("%s -- ERROR: cannot specify both verbose and quiet options.\n\n", cmd);
/* Display the help. */
rc = 1;
}
break;
case 'h':
case '?':
/* Display the help. */
rc = 1;
break;
default:
printf("%s -- unrecognized option \"%c\"\n\n", cmd, c);
/* Display the help. */
rc = 1;
break;
}
}
return rc;
}
int main(int argc, char * * argv, char * * env) {
int rc = 0;
struct stat statbuf;
cmd = basename(argv[0]);
/* Check if devfs is installed. If it is, there is nothing to do. */
rc = stat("/dev/.devfsd", &statbuf);
if (rc == 0) {
printf("Devfs is running on this system. Devfs will keep the EVMS device nodes up to date. %s has nothing to do.\n", cmd);
return 0;
}
rc = parse_options(argc, argv);
if (rc == 0) {
pid_t pid;
if (daemon_mode) {
int evms_block_dev_handle = 0;
evms_block_dev_handle = open(EVMS_DEVICE_NAME, O_RDWR|O_NONBLOCK);
if (evms_block_dev_handle > 0) {
pid = fork();
if (pid == 0) {
/* I am the spawed process. */
int status;
evms_notify_t kernel_notify;
sem_init(&daemon_sem, 0, 0);
signal(SIGCONT, sigcont_handler);
/* Tell the EVMS kernel which process to signal. */
kernel_notify.command = 1; /* register */
kernel_notify.eventry.pid = getpid();
kernel_notify.eventry.eventid = EVMS_EVENT_END_OF_DISCOVERY;
kernel_notify.eventry.signo = SIGCONT;
kernel_notify.status = 0;
status = ioctl(evms_block_dev_handle, EVMS_PROCESS_NOTIFY_EVENT, &kernel_notify);
if ((status == 0) && (kernel_notify.status == 0)) {
daemon_running = TRUE;
while (daemon_running && (rc == 0)) {
sem_wait(&daemon_sem);
if (daemon_running) {
rc = evms_update_evms_dev_tree(verbose_level);
}
}
/* Tell the EVMS kernel to stop signalling the process. */
kernel_notify.command = 0; /* unregister */
ioctl(evms_block_dev_handle, EVMS_PROCESS_NOTIFY_EVENT, &kernel_notify);
} else {
/*
* We failed to register for notifications from the
* kernel.
*/
if (status != 0) {
printf("%s daemon: error from ioctl to register for notifications from the EVMS kernel: %s\n", cmd, strerror(errno));
rc = errno;
} else {
printf("%s daemon: error code %d returned in the ioctl to register for notifications from the EVMS kernel.\n", cmd, kernel_notify.status);
rc = kernel_notify.status;
}
}
} else {
if (pid != -1) {
printf("%s -- daemon processs started.\n", cmd);
} else {
printf("%s -- error spawning daemon process: %s\n", cmd, strerror(errno));
rc = errno;
}
}
} else {
printf("%s -- error opening the EVMS block device: %s\n", cmd, strerror(errno));
rc = errno;
}
} else {
if (verbose_level != NO_MESSAGES) {
printf("%s -- updating the EVMS device node tree...\n", cmd);
}
rc = evms_update_evms_dev_tree(verbose_level);
if (verbose_level != NO_MESSAGES) {
if (rc == 0) {
printf("%s -- Finished.\n", cmd);
} else {
printf("%s -- ERROR: return code from evms_update_evms_dev_tree() was %d.\n", cmd, rc);
}
}
}
} else {
show_help();
}
return rc;
}
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