asterisk/res/res_limit.c

216 lines
5.4 KiB
C

/*
* Asterisk -- An open source telephony toolkit.
*
* Resource limits
*
* Copyright (c) 2006 Tilghman Lesher. All rights reserved.
*
* Tilghman Lesher <res_limit_200607@the-tilghman.com>
*
* This code is released by the author with no restrictions on usage.
*
*/
/*! \file
*
* \brief Resource limits
*
* \author Tilghman Lesher <res_limit_200607@the-tilghman.com>
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <ctype.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "asterisk/module.h"
#include "asterisk/cli.h"
/* Find proper rlimit for virtual memory */
#ifdef RLIMIT_AS
#define VMEM_DEF RLIMIT_AS
#else
#ifdef RLIMIT_VMEM
#define VMEM_DEF RLIMIT_VMEM
#endif
#endif
static const struct limits {
int resource;
char limit[3];
char desc[40];
char clicmd[15];
} limits[] = {
{ RLIMIT_CPU, "-t", "cpu time", "time" },
{ RLIMIT_FSIZE, "-f", "file size" , "file" },
{ RLIMIT_DATA, "-d", "program data segment", "data" },
{ RLIMIT_STACK, "-s", "program stack size", "stack" },
{ RLIMIT_CORE, "-c", "core file size", "core" },
#ifdef RLIMIT_RSS
{ RLIMIT_RSS, "-m", "resident memory", "memory" },
{ RLIMIT_MEMLOCK, "-l", "amount of memory locked into RAM", "locked" },
#endif
#ifdef RLIMIT_NPROC
{ RLIMIT_NPROC, "-u", "number of processes", "processes" },
#endif
{ RLIMIT_NOFILE, "-n", "number of file descriptors", "descriptors" },
#ifdef VMEM_DEF
{ VMEM_DEF, "-v", "virtual memory", "virtual" },
#endif
};
static int str2limit(const char *string)
{
size_t i;
for (i = 0; i < ARRAY_LEN(limits); i++) {
if (!strcasecmp(string, limits[i].clicmd))
return limits[i].resource;
}
return -1;
}
static const char *str2desc(const char *string)
{
size_t i;
for (i = 0; i < ARRAY_LEN(limits); i++) {
if (!strcmp(string, limits[i].clicmd))
return limits[i].desc;
}
return "<unknown>";
}
static char *complete_ulimit(struct ast_cli_args *a)
{
int which = 0, i;
int wordlen = strlen(a->word);
if (a->pos > 1)
return NULL;
for (i = 0; i < ARRAY_LEN(limits); i++) {
if (!strncasecmp(limits[i].clicmd, a->word, wordlen)) {
if (++which > a->n)
return ast_strdup(limits[i].clicmd);
}
}
return NULL;
}
static char *handle_cli_ulimit(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
int resource;
struct rlimit rlimit = { 0, 0 };
switch (cmd) {
case CLI_INIT:
e->command = "ulimit";
e->usage =
"Usage: ulimit {data|"
#ifdef RLIMIT_RSS
"limit|"
#endif
"file|"
#ifdef RLIMIT_RSS
"memory|"
#endif
"stack|time|"
#ifdef RLIMIT_NPROC
"processes|"
#endif
#ifdef VMEM_DEF
"virtual|"
#endif
"core|descriptors} [<num>]\n"
" Shows or sets the corresponding resource limit.\n"
" data Process data segment [readonly]\n"
#ifdef RLIMIT_RSS
" lock Memory lock size [readonly]\n"
#endif
" file File size\n"
#ifdef RLIMIT_RSS
" memory Process resident memory [readonly]\n"
#endif
" stack Process stack size [readonly]\n"
" time CPU usage [readonly]\n"
#ifdef RLIMIT_NPROC
" processes Child processes\n"
#endif
#ifdef VMEM_DEF
" virtual Process virtual memory [readonly]\n"
#endif
" core Core dump file size\n"
" descriptors Number of file descriptors\n";
return NULL;
case CLI_GENERATE:
return complete_ulimit(a);
}
if (a->argc > 3)
return CLI_SHOWUSAGE;
if (a->argc == 1) {
char arg2[15];
const char * const newargv[2] = { "ulimit", arg2 };
for (resource = 0; resource < ARRAY_LEN(limits); resource++) {
struct ast_cli_args newArgs = { .argv = newargv, .argc = 2 };
ast_copy_string(arg2, limits[resource].clicmd, sizeof(arg2));
handle_cli_ulimit(e, CLI_HANDLER, &newArgs);
}
return CLI_SUCCESS;
} else {
resource = str2limit(a->argv[1]);
if (resource == -1) {
ast_cli(a->fd, "Unknown resource\n");
return CLI_FAILURE;
}
if (a->argc == 3) {
int x;
#ifdef RLIMIT_NPROC
if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_NPROC && resource != RLIMIT_FSIZE) {
#else
if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_FSIZE) {
#endif
ast_cli(a->fd, "Resource not permitted to be set\n");
return CLI_FAILURE;
}
sscanf(a->argv[2], "%30d", &x);
rlimit.rlim_max = rlimit.rlim_cur = x;
setrlimit(resource, &rlimit);
return CLI_SUCCESS;
} else {
if (!getrlimit(resource, &rlimit)) {
char printlimit[32];
const char *desc;
if (rlimit.rlim_max == RLIM_INFINITY)
ast_copy_string(printlimit, "effectively unlimited", sizeof(printlimit));
else
snprintf(printlimit, sizeof(printlimit), "limited to %d", (int) rlimit.rlim_cur);
desc = str2desc(a->argv[1]);
ast_cli(a->fd, "%c%s (%s) is %s.\n", toupper(desc[0]), desc + 1, a->argv[1], printlimit);
} else
ast_cli(a->fd, "Could not retrieve resource limits for %s: %s\n", str2desc(a->argv[1]), strerror(errno));
return CLI_SUCCESS;
}
}
}
static struct ast_cli_entry cli_ulimit =
AST_CLI_DEFINE(handle_cli_ulimit, "Set or show process resource limits");
static int unload_module(void)
{
return ast_cli_unregister(&cli_ulimit);
}
static int load_module(void)
{
return ast_cli_register(&cli_ulimit) ? AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Resource limits");