/* Prepare to start a process whose command-line arguments are given by the
* null-terminated 'argv' array. Returns 0 if successful, otherwise a
* positive errno value. */
static int
process_prestart(char **argv)
{
char *binary;
process_init();
/* Log the process to be started. */
if (VLOG_IS_DBG_ENABLED()) {
char *args = process_escape_args(argv);
VLOG_DBG("starting subprocess: %s", args);
free(args);
}
/* execvp() will search PATH too, but the error in that case is more
* obscure, since it is only reported post-fork. */
binary = process_search_path(argv[0]);
if (!binary) {
VLOG_ERR("%s not found in PATH", argv[0]);
return ENOENT;
}
free(binary);
return 0;
}
int
main(int argc, char *argv[])
{
struct ovsdb_idl *idl;
struct ctl_command *commands;
struct shash local_options;
unsigned int seqno;
size_t n_commands;
char *args;
set_program_name(argv[0]);
fatal_ignore_sigpipe();
vlog_set_levels(NULL, VLF_CONSOLE, VLL_WARN);
vlog_set_levels_from_string_assert("reconnect:warn");
sbrec_init();
sbctl_cmd_init();
/* Log our arguments. This is often valuable for debugging systems. */
args = process_escape_args(argv);
VLOG(ctl_might_write_to_db(argv) ? VLL_INFO : VLL_DBG, "Called as %s", args);
/* Parse command line. */
shash_init(&local_options);
parse_options(argc, argv, &local_options);
commands = ctl_parse_commands(argc - optind, argv + optind, &local_options,
&n_commands);
if (timeout) {
time_alarm(timeout);
}
/* Initialize IDL. */
idl = the_idl = ovsdb_idl_create(db, &sbrec_idl_class, false, false);
run_prerequisites(commands, n_commands, idl);
/* Execute the commands.
*
* 'seqno' is the database sequence number for which we last tried to
* execute our transaction. There's no point in trying to commit more than
* once for any given sequence number, because if the transaction fails
* it's because the database changed and we need to obtain an up-to-date
* view of the database before we try the transaction again. */
seqno = ovsdb_idl_get_seqno(idl);
for (;;) {
ovsdb_idl_run(idl);
if (!ovsdb_idl_is_alive(idl)) {
int retval = ovsdb_idl_get_last_error(idl);
ctl_fatal("%s: database connection failed (%s)",
db, ovs_retval_to_string(retval));
}
if (seqno != ovsdb_idl_get_seqno(idl)) {
seqno = ovsdb_idl_get_seqno(idl);
if (do_sbctl(args, commands, n_commands, idl)) {
free(args);
exit(EXIT_SUCCESS);
}
}
if (seqno == ovsdb_idl_get_seqno(idl)) {
ovsdb_idl_wait(idl);
poll_block();
}
}
}
