/* If a pidfile has been configured, creates it and stores the running
* process's pid in it. Ensures that the pidfile will be deleted when the
* process exits. */
static void
make_pidfile(void)
{
int error;
error = GetFileAttributes(pidfile);
if (error != INVALID_FILE_ATTRIBUTES) {
/* pidfile exists. Try to unlink() it. */
error = unlink(pidfile);
if (error) {
VLOG_FATAL("Failed to delete existing pidfile %s (%s)", pidfile,
ovs_strerror(errno));
}
}
filep_pidfile = fopen(pidfile, "w");
if (filep_pidfile == NULL) {
VLOG_FATAL("failed to open %s (%s)", pidfile, ovs_strerror(errno));
}
fatal_signal_add_hook(unlink_pidfile, NULL, NULL, true);
fprintf(filep_pidfile, "%d\n", _getpid());
if (fflush(filep_pidfile) == EOF) {
VLOG_FATAL("Failed to write into the pidfile %s", pidfile);
}
/* Don't close the pidfile till the process exits. */
}
/* Registers 'file' to be unlinked when the program terminates via exit() or a
* fatal signal. */
void
fatal_signal_add_file_to_unlink(const char *file)
{
static bool added_hook = false;
if (!added_hook) {
added_hook = true;
fatal_signal_add_hook(unlink_files, NULL, true);
fatal_signal_add_hook(destroy_pipeline, NULL, true);
}
fatal_signal_block();
if (n_files >= max_files) {
files = x2nrealloc(files, &max_files, sizeof *files);
}
files[n_files++] = xstrdup(file);
fatal_signal_unblock();
}
/* Registers 'file' to be unlinked when the program terminates via exit() or a
* fatal signal. */
void
fatal_signal_add_file_to_unlink(const char *file)
{
if (!added_hook) {
added_hook = true;
fatal_signal_add_hook(unlink_files, cancel_files, NULL, true);
}
sset_add(&files, file);
}
/* Registers 'file' to be unlinked when the program terminates via exit() or a
* fatal signal. */
void
fatal_signal_add_file_to_unlink(const char *file)
{
fatal_signal_init();
ovs_mutex_lock(&mutex);
if (!added_hook) {
added_hook = true;
fatal_signal_add_hook(unlink_files, cancel_files, NULL, true);
}
sset_add(&files, file);
ovs_mutex_unlock(&mutex);
}
int
main(int argc, char *argv[])
{
struct dhclient *cli;
int error;
set_program_name(argv[0]);
register_fault_handlers();
vlog_init();
parse_options(argc, argv);
argc -= optind;
argv += optind;
if (argc != 1) {
ofp_fatal(0, "exactly one non-option argument required; "
"use --help for help");
}
error = dhclient_create(argv[0], modify_dhcp_request, NULL, NULL, &cli);
if (error) {
ofp_fatal(error, "dhclient_create failed");
}
dhclient_init(cli, request_ip.s_addr);
fatal_signal_add_hook(release, cli, true);
for (;;) {
fatal_signal_block();
dhclient_run(cli);
if (dhclient_changed(cli)) {
dhclient_configure_netdev(cli);
if (update_resolv_conf) {
dhclient_update_resolv_conf(cli);
}
}
dhclient_wait(cli);
fatal_signal_unblock();
poll_block();
}
}