X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=ovsdb%2Fovsdb-client.c;h=aaee5dbf82ea3704fcff662d7093e5592788d971;hb=e65dc5c57e4520d838350607d256f251e4d81235;hp=0900a675277648002b5a753e167854d5fa6f53ff;hpb=0c65cde9db1d0586ae9d9c5abec0bef978ff86a5;p=openvswitch
diff --git a/ovsdb/ovsdb-client.c b/ovsdb/ovsdb-client.c
index 0900a675..aaee5dbf 100644
--- a/ovsdb/ovsdb-client.c
+++ b/ovsdb/ovsdb-client.c
@@ -33,15 +33,17 @@
#include "json.h"
#include "jsonrpc.h"
#include "ovsdb.h"
+#include "ovsdb-data.h"
#include "ovsdb-error.h"
+#include "sort.h"
#include "stream.h"
#include "stream-ssl.h"
#include "table.h"
#include "timeval.h"
#include "util.h"
-
#include "vlog.h"
-#define THIS_MODULE VLM_ovsdb_client
+
+VLOG_DEFINE_THIS_MODULE(ovsdb_client);
/* --format: Output formatting. */
static enum {
@@ -56,6 +58,12 @@ static int output_headings = true;
/* --pretty: Flags to pass to json_to_string(). */
static int json_flags = JSSF_SORT;
+/* --data: Format of data in output tables. */
+static enum {
+ DF_STRING, /* String format. */
+ DF_JSON, /* JSON. */
+} data_format;
+
static const struct command all_commands[];
static void usage(void) NO_RETURN;
@@ -66,8 +74,6 @@ main(int argc, char *argv[])
{
proctitle_init(argc, argv);
set_program_name(argv[0]);
- time_init();
- vlog_init();
parse_options(argc, argv);
signal(SIGPIPE, SIG_IGN);
run_command(argc - optind, argv + optind, all_commands);
@@ -82,7 +88,8 @@ parse_options(int argc, char *argv[])
};
static struct option long_options[] = {
{"format", required_argument, 0, 'f'},
- {"no-headings", no_argument, &output_headings, 0},
+ {"data", required_argument, 0, 'd'},
+ {"no-headings", no_argument, &output_headings, 0},
{"pretty", no_argument, &json_flags, JSSF_PRETTY | JSSF_SORT},
{"verbose", optional_argument, 0, 'v'},
{"help", no_argument, 0, 'h'},
@@ -117,6 +124,16 @@ parse_options(int argc, char *argv[])
}
break;
+ case 'd':
+ if (!strcmp(optarg, "string")) {
+ data_format = DF_STRING;
+ } else if (!strcmp(optarg, "json")) {
+ data_format = DF_JSON;
+ } else {
+ ovs_fatal(0, "unknown data format \"%s\"", optarg);
+ }
+ break;
+
case 'h':
usage();
@@ -162,16 +179,19 @@ usage(void)
" list databases available on SERVER\n"
"\n get-schema SERVER DATABASE\n"
" retrieve schema for DATABASE from SERVER\n"
- "\n list-tables SERVER DATABSE\n"
- " list tables for DATABSAE on SERVER\n"
+ "\n list-tables SERVER DATABASE\n"
+ " list tables for DATABASE on SERVER\n"
"\n list-columns SERVER DATABASE [TABLE]\n"
" list columns in TABLE (or all tables) in DATABASE on SERVER\n"
"\n transact SERVER TRANSACTION\n"
" run TRANSACTION (a JSON array of operations) on SERVER\n"
" and print the results as JSON on stdout\n"
- "\n monitor SERVER DATABASE TABLE [COLUMN,...] [SELECT,...]\n"
- " monitor contents of (COLUMNs in) TABLE in DATABASE on SERVER\n"
- " Valid SELECTs are: initial, insert, delete, modify\n",
+ "\n monitor SERVER DATABASE TABLE [COLUMN,...]...\n"
+ " monitor contents of COLUMNs in TABLE in DATABASE on SERVER.\n"
+ " COLUMNs may include !initial, !insert, !delete, !modify\n"
+ " to avoid seeing the specified kinds of changes.\n"
+ "\n dump SERVER DATABASE\n"
+ " dump contents of DATABASE on SERVER to stdout\n",
program_name, program_name);
stream_usage("SERVER", true, true, true);
printf("\nOutput formatting options:\n"
@@ -203,11 +223,11 @@ open_jsonrpc(const char *server)
struct stream *stream;
int error;
- error = stream_open_block(server, &stream);
+ error = stream_open_block(jsonrpc_stream_open(server, &stream), &stream);
if (error == EAFNOSUPPORT) {
struct pstream *pstream;
- error = pstream_open(server, &pstream);
+ error = jsonrpc_pstream_open(server, &pstream);
if (error) {
ovs_fatal(error, "failed to connect or listen to \"%s\"", server);
}
@@ -294,6 +314,7 @@ struct table {
size_t n_columns, allocated_columns;
size_t n_rows, allocated_rows;
size_t current_column;
+ char *caption;
};
static void
@@ -316,6 +337,15 @@ table_destroy(struct table *table)
free(table->cells[i]);
}
free(table->cells);
+
+ free(table->caption);
+}
+
+static void
+table_set_caption(struct table *table, char *caption)
+{
+ free(table->caption);
+ table->caption = caption;
}
static void
@@ -403,9 +433,18 @@ table_print_table_line__(struct ds *line)
static void
table_print_table__(const struct table *table)
{
+ static int n = 0;
struct ds line = DS_EMPTY_INITIALIZER;
size_t x, y;
+ if (n++ > 0) {
+ putchar('\n');
+ }
+
+ if (table->caption) {
+ puts(table->caption);
+ }
+
if (output_headings) {
for (x = 0; x < table->n_columns; x++) {
const struct column *column = &table->columns[x];
@@ -445,13 +484,14 @@ table_print_table__(const struct table *table)
}
static void
-table_print_html_cell__(const char *element, const char *content)
+table_escape_html_text__(const char *s, size_t n)
{
- const char *p;
+ size_t i;
- printf(" <%s>", element);
- for (p = content; *p != '\0'; p++) {
- switch (*p) {
+ for (i = 0; i < n; i++) {
+ char c = s[i];
+
+ switch (c) {
case '&':
fputs("&", stdout);
break;
@@ -461,11 +501,33 @@ table_print_html_cell__(const char *element, const char *content)
case '>':
fputs(">", stdout);
break;
+ case '"':
+ fputs(""", stdout);
+ break;
default:
- putchar(*p);
+ putchar(c);
break;
}
}
+}
+
+static void
+table_print_html_cell__(const char *element, const char *content)
+{
+ const char *p;
+
+ printf(" <%s>", element);
+ for (p = content; *p; ) {
+ struct uuid uuid;
+
+ if (uuid_from_string_prefix(&uuid, p)) {
+ printf("%.*s", UUID_LEN, p, 8, p);
+ p += UUID_LEN;
+ } else {
+ table_escape_html_text__(p, 1);
+ p++;
+ }
+ }
printf("%s>\n", element);
}
@@ -474,7 +536,11 @@ table_print_html__(const struct table *table)
{
size_t x, y;
- fputs("
\n", stdout);
+ fputs("\n", stdout);
+
+ if (table->caption) {
+ table_print_html_cell__("caption", table->caption);
+ }
if (output_headings) {
fputs(" \n", stdout);
@@ -488,7 +554,17 @@ table_print_html__(const struct table *table)
for (y = 0; y < table->n_rows; y++) {
fputs("
\n", stdout);
for (x = 0; x < table->n_columns; x++) {
- table_print_html_cell__("td", *table_cell__(table, y, x));
+ const char *content = *table_cell__(table, y, x);
+
+ if (!strcmp(table->columns[x].heading, "_uuid")) {
+ fputs(" ", stdout);
+ table_escape_html_text__(content, 8);
+ fputs(" | \n", stdout);
+ } else {
+ table_print_html_cell__("td", content);
+ }
}
fputs("
\n", stdout);
}
@@ -522,8 +598,17 @@ table_print_csv_cell__(const char *content)
static void
table_print_csv__(const struct table *table)
{
+ static int n = 0;
size_t x, y;
+ if (n++ > 0) {
+ putchar('\n');
+ }
+
+ if (table->caption) {
+ puts(table->caption);
+ }
+
if (output_headings) {
for (x = 0; x < table->n_columns; x++) {
const struct column *column = &table->columns[x];
@@ -613,15 +698,11 @@ do_list_tables(int argc OVS_UNUSED, char *argv[])
schema = fetch_schema(argv[1], argv[2]);
table_init(&t);
table_add_column(&t, "Table");
- table_add_column(&t, "Comment");
SHASH_FOR_EACH (node, &schema->tables) {
struct ovsdb_table_schema *ts = node->data;
table_add_row(&t);
table_add_cell(&t, ts->name);
- if (ts->comment) {
- table_add_cell(&t, ts->comment);
- }
}
ovsdb_schema_destroy(schema);
table_print(&t);
@@ -642,7 +723,6 @@ do_list_columns(int argc OVS_UNUSED, char *argv[])
}
table_add_column(&t, "Column");
table_add_column(&t, "Type");
- table_add_column(&t, "Comment");
SHASH_FOR_EACH (table_node, &schema->tables) {
struct ovsdb_table_schema *ts = table_node->data;
@@ -659,9 +739,6 @@ do_list_columns(int argc OVS_UNUSED, char *argv[])
}
table_add_cell(&t, column->name);
table_add_cell_nocopy(&t, json_to_string(type, JSSF_SORT));
- if (column->comment) {
- table_add_cell(&t, column->comment);
- }
json_destroy(type);
}
@@ -697,6 +774,30 @@ do_transact(int argc OVS_UNUSED, char *argv[])
jsonrpc_close(rpc);
}
+static char *
+format_json(const struct json *json, const struct ovsdb_type *type)
+{
+ if (data_format == DF_JSON) {
+ return json_to_string(json, JSSF_SORT);
+ } else if (data_format == DF_STRING) {
+ struct ovsdb_datum datum;
+ struct ovsdb_error *error;
+ struct ds s;
+
+ error = ovsdb_datum_from_json(&datum, type, json, NULL);
+ if (error) {
+ return json_to_string(json, JSSF_SORT);
+ }
+
+ ds_init(&s);
+ ovsdb_datum_to_string(&datum, type, &s);
+ ovsdb_datum_destroy(&datum, type);
+ return ds_steal_cstr(&s);
+ } else {
+ NOT_REACHED();
+ }
+}
+
static void
monitor_print_row(struct json *row, const char *type, const char *uuid,
const struct ovsdb_column_set *columns, struct table *t)
@@ -718,7 +819,7 @@ monitor_print_row(struct json *row, const char *type, const char *uuid,
const struct ovsdb_column *column = columns->columns[i];
struct json *value = shash_find_data(json_object(row), column->name);
if (value) {
- table_add_cell_nocopy(t, json_to_string(value, JSSF_SORT));
+ table_add_cell_nocopy(t, format_json(value, &column->type));
} else {
table_add_cell(t, "");
}
@@ -780,6 +881,87 @@ monitor_print(struct json *table_updates,
table_destroy(&t);
}
+static void
+add_column(const char *server, const struct ovsdb_column *column,
+ struct ovsdb_column_set *columns, struct json *columns_json)
+{
+ if (ovsdb_column_set_contains(columns, column->index)) {
+ ovs_fatal(0, "%s: column \"%s\" mentioned multiple times",
+ server, column->name);
+ }
+ ovsdb_column_set_add(columns, column);
+ json_array_add(columns_json, json_string_create(column->name));
+}
+
+static struct json *
+parse_monitor_columns(char *arg, const char *server, const char *database,
+ const struct ovsdb_table_schema *table,
+ struct ovsdb_column_set *columns)
+{
+ bool initial, insert, delete, modify;
+ struct json *mr, *columns_json;
+ char *save_ptr = NULL;
+ char *token;
+
+ mr = json_object_create();
+ columns_json = json_array_create_empty();
+ json_object_put(mr, "columns", columns_json);
+
+ initial = insert = delete = modify = true;
+ for (token = strtok_r(arg, ",", &save_ptr); token != NULL;
+ token = strtok_r(NULL, ",", &save_ptr)) {
+ if (!strcmp(token, "!initial")) {
+ initial = false;
+ } else if (!strcmp(token, "!insert")) {
+ insert = false;
+ } else if (!strcmp(token, "!delete")) {
+ delete = false;
+ } else if (!strcmp(token, "!modify")) {
+ modify = false;
+ } else {
+ const struct ovsdb_column *column;
+
+ column = ovsdb_table_schema_get_column(table, token);
+ if (!column) {
+ ovs_fatal(0, "%s: table \"%s\" in %s does not have a "
+ "column named \"%s\"",
+ server, table->name, database, token);
+ }
+ add_column(server, column, columns, columns_json);
+ }
+ }
+
+ if (columns_json->u.array.n == 0) {
+ const struct shash_node **nodes;
+ size_t i, n;
+
+ n = shash_count(&table->columns);
+ nodes = shash_sort(&table->columns);
+ for (i = 0; i < n; i++) {
+ const struct ovsdb_column *column = nodes[i]->data;
+ if (column->index != OVSDB_COL_UUID
+ && column->index != OVSDB_COL_VERSION) {
+ add_column(server, column, columns, columns_json);
+ }
+ }
+ free(nodes);
+
+ add_column(server, ovsdb_table_schema_get_column(table,"_version"),
+ columns, columns_json);
+ }
+
+ if (!initial || !insert || !delete || !modify) {
+ struct json *select = json_object_create();
+ json_object_put(select, "initial", json_boolean_create(initial));
+ json_object_put(select, "insert", json_boolean_create(insert));
+ json_object_put(select, "delete", json_boolean_create(delete));
+ json_object_put(select, "modify", json_boolean_create(modify));
+ json_object_put(mr, "select", select);
+ }
+
+ return mr;
+}
+
static void
do_monitor(int argc, char *argv[])
{
@@ -791,8 +973,8 @@ do_monitor(int argc, char *argv[])
struct ovsdb_schema *schema;
struct jsonrpc_msg *request;
struct jsonrpc *rpc;
- struct json *select, *monitor, *monitor_request, *monitor_requests,
- *request_id;
+ struct json *monitor, *monitor_request_array,
+ *monitor_requests, *request_id;
rpc = open_jsonrpc(server);
@@ -803,54 +985,27 @@ do_monitor(int argc, char *argv[])
server, database, table_name);
}
- if (argc >= 5 && *argv[4] != '\0') {
- char *save_ptr = NULL;
- char *token;
-
- for (token = strtok_r(argv[4], ",", &save_ptr); token != NULL;
- token = strtok_r(NULL, ",", &save_ptr)) {
- const struct ovsdb_column *column;
- column = ovsdb_table_schema_get_column(table, token);
- if (!column) {
- ovs_fatal(0, "%s: table \"%s\" in %s does not have a "
- "column named \"%s\"",
- server, table_name, database, token);
- }
- ovsdb_column_set_add(&columns, column);
- }
- } else {
- struct shash_node *node;
-
- SHASH_FOR_EACH (node, &table->columns) {
- const struct ovsdb_column *column = node->data;
- if (column->index != OVSDB_COL_UUID) {
- ovsdb_column_set_add(&columns, column);
- }
- }
- }
-
- if (argc >= 6 && *argv[5] != '\0') {
- char *save_ptr = NULL;
- char *token;
+ monitor_request_array = json_array_create_empty();
+ if (argc > 4) {
+ int i;
- select = json_object_create();
- for (token = strtok_r(argv[5], ",", &save_ptr); token != NULL;
- token = strtok_r(NULL, ",", &save_ptr)) {
- json_object_put(select, token, json_boolean_create(true));
+ for (i = 4; i < argc; i++) {
+ json_array_add(
+ monitor_request_array,
+ parse_monitor_columns(argv[i], server, database, table,
+ &columns));
}
} else {
- select = NULL;
- }
-
- monitor_request = json_object_create();
- json_object_put(monitor_request,
- "columns", ovsdb_column_set_to_json(&columns));
- if (select) {
- json_object_put(monitor_request, "select", select);
+ /* Allocate a writable empty string since parse_monitor_columns() is
+ * going to strtok() it and that's risky with literal "". */
+ char empty[] = "";
+ json_array_add(
+ monitor_request_array,
+ parse_monitor_columns(empty, server, database, table, &columns));
}
monitor_requests = json_object_create();
- json_object_put(monitor_requests, table_name, monitor_request);
+ json_object_put(monitor_requests, table_name, monitor_request_array);
monitor = json_array_create_3(json_string_create(database),
json_null_create(), monitor_requests);
@@ -897,6 +1052,241 @@ do_monitor(int argc, char *argv[])
}
}
+struct dump_table_aux {
+ struct ovsdb_datum **data;
+ const struct ovsdb_column **columns;
+ size_t n_columns;
+};
+
+static int
+compare_data(size_t a_y, size_t b_y, size_t x,
+ const struct dump_table_aux *aux)
+{
+ return ovsdb_datum_compare_3way(&aux->data[a_y][x],
+ &aux->data[b_y][x],
+ &aux->columns[x]->type);
+}
+
+static int
+compare_rows(size_t a_y, size_t b_y, void *aux_)
+{
+ struct dump_table_aux *aux = aux_;
+ size_t x;
+
+ /* Skip UUID columns on the first pass, since their values tend to be
+ * random and make our results less reproducible. */
+ for (x = 0; x < aux->n_columns; x++) {
+ if (aux->columns[x]->type.key.type != OVSDB_TYPE_UUID) {
+ int cmp = compare_data(a_y, b_y, x, aux);
+ if (cmp) {
+ return cmp;
+ }
+ }
+ }
+
+ /* Use UUID columns as tie-breakers. */
+ for (x = 0; x < aux->n_columns; x++) {
+ if (aux->columns[x]->type.key.type == OVSDB_TYPE_UUID) {
+ int cmp = compare_data(a_y, b_y, x, aux);
+ if (cmp) {
+ return cmp;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static void
+swap_rows(size_t a_y, size_t b_y, void *aux_)
+{
+ struct dump_table_aux *aux = aux_;
+ struct ovsdb_datum *tmp = aux->data[a_y];
+ aux->data[a_y] = aux->data[b_y];
+ aux->data[b_y] = tmp;
+}
+
+static char *
+format_data(const struct ovsdb_datum *datum, const struct ovsdb_type *type)
+{
+ if (data_format == DF_JSON) {
+ struct json *json = ovsdb_datum_to_json(datum, type);
+ char *s = json_to_string(json, JSSF_SORT);
+ json_destroy(json);
+ return s;
+ } else if (data_format == DF_STRING) {
+ struct ds s;
+
+ ds_init(&s);
+ ovsdb_datum_to_string(datum, type, &s);
+ return ds_steal_cstr(&s);
+ } else {
+ NOT_REACHED();
+ }
+}
+
+static int
+compare_columns(const void *a_, const void *b_)
+{
+ const struct ovsdb_column *const *ap = a_;
+ const struct ovsdb_column *const *bp = b_;
+ const struct ovsdb_column *a = *ap;
+ const struct ovsdb_column *b = *bp;
+
+ return strcmp(a->name, b->name);
+}
+
+static void
+dump_table(const struct ovsdb_table_schema *ts, struct json_array *rows)
+{
+ const struct ovsdb_column **columns;
+ size_t n_columns;
+
+ struct ovsdb_datum **data;
+
+ struct dump_table_aux aux;
+ struct shash_node *node;
+ struct table t;
+ size_t x, y;
+
+ /* Sort columns by name, for reproducibility. */
+ columns = xmalloc(shash_count(&ts->columns) * sizeof *columns);
+ n_columns = 0;
+ SHASH_FOR_EACH (node, &ts->columns) {
+ struct ovsdb_column *column = node->data;
+ if (strcmp(column->name, "_version")) {
+ columns[n_columns++] = column;
+ }
+ }
+ qsort(columns, n_columns, sizeof *columns, compare_columns);
+
+ /* Extract data from table. */
+ data = xmalloc(rows->n * sizeof *data);
+ for (y = 0; y < rows->n; y++) {
+ struct shash *row;
+
+ if (rows->elems[y]->type != JSON_OBJECT) {
+ ovs_fatal(0, "row %zu in table %s response is not a JSON object: "
+ "%s", y, ts->name, json_to_string(rows->elems[y], 0));
+ }
+ row = json_object(rows->elems[y]);
+
+ data[y] = xmalloc(n_columns * sizeof **data);
+ for (x = 0; x < n_columns; x++) {
+ const struct json *json = shash_find_data(row, columns[x]->name);
+ if (!json) {
+ ovs_fatal(0, "row %zu in table %s response lacks %s column",
+ y, ts->name, columns[x]->name);
+ }
+
+ check_ovsdb_error(ovsdb_datum_from_json(&data[y][x],
+ &columns[x]->type,
+ json, NULL));
+ }
+ }
+
+ /* Sort rows by column values, for reproducibility. */
+ aux.data = data;
+ aux.columns = columns;
+ aux.n_columns = n_columns;
+ sort(rows->n, compare_rows, swap_rows, &aux);
+
+ /* Add column headings. */
+ table_init(&t);
+ table_set_caption(&t, xasprintf("%s table", ts->name));
+ for (x = 0; x < n_columns; x++) {
+ table_add_column(&t, "%s", columns[x]->name);
+ }
+
+ /* Print rows. */
+ for (y = 0; y < rows->n; y++) {
+ table_add_row(&t);
+ for (x = 0; x < n_columns; x++) {
+ table_add_cell_nocopy(&t, format_data(&data[y][x],
+ &columns[x]->type));
+ }
+ }
+ table_print(&t);
+ table_destroy(&t);
+}
+
+static void
+do_dump(int argc OVS_UNUSED, char *argv[])
+{
+ const char *server = argv[1];
+ const char *database = argv[2];
+
+ struct jsonrpc_msg *request, *reply;
+ struct ovsdb_schema *schema;
+ struct json *transaction;
+ struct jsonrpc *rpc;
+ int error;
+
+ const struct shash_node **tables;
+ size_t n_tables;
+
+ size_t i;
+
+ rpc = open_jsonrpc(server);
+
+ schema = fetch_schema_from_rpc(rpc, database);
+ tables = shash_sort(&schema->tables);
+ n_tables = shash_count(&schema->tables);
+
+ /* Construct transaction to retrieve entire database. */
+ transaction = json_array_create_1(json_string_create(database));
+ for (i = 0; i < n_tables; i++) {
+ const struct ovsdb_table_schema *ts = tables[i]->data;
+ struct json *op, *columns;
+ struct shash_node *node;
+
+ columns = json_array_create_empty();
+ SHASH_FOR_EACH (node, &ts->columns) {
+ const struct ovsdb_column *column = node->data;
+
+ if (strcmp(column->name, "_version")) {
+ json_array_add(columns, json_string_create(column->name));
+ }
+ }
+
+ op = json_object_create();
+ json_object_put_string(op, "op", "select");
+ json_object_put_string(op, "table", tables[i]->name);
+ json_object_put(op, "where", json_array_create_empty());
+ json_object_put(op, "columns", columns);
+ json_array_add(transaction, op);
+ }
+
+ /* Send request, get reply. */
+ request = jsonrpc_create_request("transact", transaction, NULL);
+ error = jsonrpc_transact_block(rpc, request, &reply);
+ if (error) {
+ ovs_fatal(error, "transaction failed");
+ }
+
+ /* Print database contents. */
+ if (reply->result->type != JSON_ARRAY
+ || reply->result->u.array.n != n_tables) {
+ ovs_fatal(0, "reply is not array of %zu elements: %s",
+ n_tables, json_to_string(reply->result, 0));
+ }
+ for (i = 0; i < n_tables; i++) {
+ const struct ovsdb_table_schema *ts = tables[i]->data;
+ const struct json *op_result = reply->result->u.array.elems[i];
+ struct json *rows;
+
+ if (op_result->type != JSON_OBJECT
+ || !(rows = shash_find_data(json_object(op_result), "rows"))
+ || rows->type != JSON_ARRAY) {
+ ovs_fatal(0, "%s table reply is not an object with a \"rows\" "
+ "member array: %s",
+ ts->name, json_to_string(op_result, 0));
+ }
+
+ dump_table(ts, &rows->u.array);
+ }
+}
+
static void
do_help(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
{
@@ -909,7 +1299,8 @@ static const struct command all_commands[] = {
{ "list-tables", 2, 2, do_list_tables },
{ "list-columns", 2, 3, do_list_columns },
{ "transact", 2, 2, do_transact },
- { "monitor", 3, 5, do_monitor },
+ { "monitor", 3, INT_MAX, do_monitor },
+ { "dump", 2, 2, do_dump },
{ "help", 0, INT_MAX, do_help },
{ NULL, 0, 0, NULL },
};