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/*
* Samba Unix/Linux SMB client library
* Interface to the g_lock facility
* Copyright (C) Volker Lendecke 2009
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "net.h"
#include "g_lock.h"
static bool net_g_lock_init(TALLOC_CTX *mem_ctx,
struct tevent_context **pev,
struct messaging_context **pmsg,
struct g_lock_ctx **pg_ctx)
{
struct tevent_context *ev = NULL;
struct messaging_context *msg = NULL;
struct g_lock_ctx *g_ctx = NULL;
ev = tevent_context_init(talloc_tos());
if (ev == NULL) {
d_fprintf(stderr, "ERROR: could not init event context\n");
goto fail;
}
msg = messaging_init(talloc_tos(), server_id_self(), ev);
if (msg == NULL) {
d_fprintf(stderr, "ERROR: could not init messaging context\n");
goto fail;
}
g_ctx = g_lock_ctx_init(talloc_tos(), msg);
if (g_ctx == NULL) {
d_fprintf(stderr, "ERROR: could not init g_lock context\n");
goto fail;
}
*pev = ev;
*pmsg = msg;
*pg_ctx = g_ctx;
return true;
fail:
TALLOC_FREE(g_ctx);
TALLOC_FREE(msg);
TALLOC_FREE(ev);
return false;
}
static int net_g_lock_do(struct net_context *c, int argc, const char **argv)
{
struct tevent_context *ev = NULL;
struct messaging_context *msg = NULL;
struct g_lock_ctx *g_ctx = NULL;
const char *name, *cmd;
int timeout, res;
bool locked = false;
NTSTATUS status;
int ret = -1;
if (argc != 3) {
d_printf("Usage: net g_lock do <lockname> <timeout> "
"<command>\n");
return -1;
}
name = argv[0];
timeout = atoi(argv[1]);
cmd = argv[2];
if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
goto done;
}
status = g_lock_lock(g_ctx, name, G_LOCK_WRITE,
timeval_set(timeout / 1000, timeout % 1000));
if (!NT_STATUS_IS_OK(status)) {
d_fprintf(stderr, "ERROR: Could not get lock: %s\n",
nt_errstr(status));
goto done;
}
locked = true;
res = system(cmd);
if (res == -1) {
d_fprintf(stderr, "ERROR: system() returned %s\n",
strerror(errno));
goto done;
}
d_fprintf(stderr, "command returned %d\n", res);
ret = 0;
done:
if (locked) {
g_lock_unlock(g_ctx, name);
}
TALLOC_FREE(g_ctx);
TALLOC_FREE(msg);
TALLOC_FREE(ev);
return ret;
}
static int net_g_lock_dump_fn(struct server_id pid, enum g_lock_type lock_type,
void *private_data)
{
char *pidstr;
pidstr = procid_str(talloc_tos(), &pid);
d_printf("%s: %s (%s)\n", pidstr,
(lock_type & 1) ? "WRITE" : "READ",
(lock_type & G_LOCK_PENDING) ? "pending" : "holder");
TALLOC_FREE(pidstr);
return 0;
}
static int net_g_lock_dump(struct net_context *c, int argc, const char **argv)
{
struct tevent_context *ev = NULL;
struct messaging_context *msg = NULL;
struct g_lock_ctx *g_ctx = NULL;
NTSTATUS status;
int ret = -1;
if (argc != 1) {
d_printf("Usage: net g_lock dump <lockname>\n");
return -1;
}
if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
goto done;
}
status = g_lock_dump(g_ctx, argv[0], net_g_lock_dump_fn, NULL);
ret = 0;
done:
TALLOC_FREE(g_ctx);
TALLOC_FREE(msg);
TALLOC_FREE(ev);
return ret;
}
static int net_g_lock_locks_fn(const char *name, void *private_data)
{
d_printf("%s\n", name);
return 0;
}
static int net_g_lock_locks(struct net_context *c, int argc, const char **argv)
{
struct tevent_context *ev = NULL;
struct messaging_context *msg = NULL;
struct g_lock_ctx *g_ctx = NULL;
int ret = -1;
if (argc != 0) {
d_printf("Usage: net g_lock locks\n");
return -1;
}
if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
goto done;
}
ret = g_lock_locks(g_ctx, net_g_lock_locks_fn, NULL);
done:
TALLOC_FREE(g_ctx);
TALLOC_FREE(msg);
TALLOC_FREE(ev);
return ret;
}
int net_g_lock(struct net_context *c, int argc, const char **argv)
{
struct functable func[] = {
{
"do",
net_g_lock_do,
NET_TRANSPORT_LOCAL,
N_("Execute a shell command under a lock"),
N_("net g_lock do <lock name> <timeout> <command>\n")
},
{
"locks",
net_g_lock_locks,
NET_TRANSPORT_LOCAL,
N_("List all locknames"),
N_("net g_lock locks\n")
},
{
"dump",
net_g_lock_dump,
NET_TRANSPORT_LOCAL,
N_("Dump a g_lock locking table"),
N_("net g_lock dump <lock name>\n")
},
{NULL, NULL, 0, NULL, NULL}
};
return net_run_function(c, argc, argv, "net g_lock", func);
}
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