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/*
* Asterisk -- A telephony toolkit for Linux.
*
* 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>
*/
#include "asterisk.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define _XOPEN_SOURCE 600
#include <string.h>
#include <ctype.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.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 struct limits {
int resource;
char limit[3];
char desc[40];
} limits[] = {
{ RLIMIT_CPU, "-t", "cpu time" },
{ RLIMIT_FSIZE, "-f", "file size" },
{ RLIMIT_DATA, "-d", "program data segment" },
{ RLIMIT_STACK, "-s", "program stack size" },
{ RLIMIT_CORE, "-c", "core file size" },
#ifdef RLIMIT_RSS
{ RLIMIT_RSS, "-m", "resident memory" },
{ RLIMIT_NPROC, "-u", "number of processes" },
{ RLIMIT_MEMLOCK, "-l", "amount of memory locked into RAM" },
#endif
{ RLIMIT_NOFILE, "-n", "number of file descriptors" },
#ifdef VMEM_DEF
{ VMEM_DEF, "-v", "virtual memory" },
#endif
};
static int str2limit(const char *string)
{
size_t i;
for (i = 0; i < sizeof(limits) / sizeof(limits[0]); i++) {
if (!strcasecmp(string, limits[i].limit))
return limits[i].resource;
}
return -1;
}
static const char *str2desc(const char *string)
{
size_t i;
for (i = 0; i < sizeof(limits) / sizeof(limits[0]); i++) {
if (!strcmp(string, limits[i].limit))
return limits[i].desc;
}
return "<unknown>";
}
static int my_ulimit(int fd, int argc, char **argv)
{
int resource;
struct rlimit rlimit = { 0, 0 };
if (argc > 3)
return RESULT_SHOWUSAGE;
if (argc == 1) {
char arg2[3];
char *newargv[2] = { "ulimit", arg2 };
for (resource = 0; resource < sizeof(limits) / sizeof(limits[0]); resource++) {
ast_copy_string(arg2, limits[resource].limit, sizeof(arg2));
my_ulimit(fd, 2, newargv);
}
return RESULT_SUCCESS;
} else {
resource = str2limit(argv[1]);
if (resource == -1) {
ast_cli(fd, "Unknown resource\n");
return RESULT_FAILURE;
}
if (argc == 3) {
int x;
if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_NPROC && resource != RLIMIT_FSIZE) {
ast_cli(fd, "Resource not permitted to be set\n");
return RESULT_FAILURE;
}
sscanf(argv[2], "%d", &x);
rlimit.rlim_max = rlimit.rlim_cur = x;
setrlimit(resource, &rlimit);
return RESULT_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(argv[1]);
ast_cli(fd, "%c%s (%s) is %s.\n", toupper(desc[0]), desc + 1, argv[1], printlimit);
} else
ast_cli(fd, "Could not retrieve resource limits for %s: %s\n", str2desc(argv[1]), strerror(errno));
return RESULT_SUCCESS;
}
}
}
static char *complete_ulimit(const char *line, const char *word, int pos, int state)
{
int which = 0, i;
int wordlen = strlen(word);
if (pos > 2)
return NULL;
for (i = 0; i < sizeof(limits) / sizeof(limits[0]); i++) {
if (!strncasecmp(limits[i].limit, word, wordlen)) {
if (++which > state)
return ast_strdup(limits[i].limit);
}
}
return NULL;
}
static const char ulimit_usage[] =
"Usage: ulimit {-d|-l|-f|-m|-s|-t|-u|-v|-c|-n} [<num>]\n"
" Shows or sets the corresponding resource limit.\n"
" -d Process data segment [readonly]\n"
" -l Memory lock size [readonly]\n"
" -f File size\n"
" -m Process resident memory [readonly]\n"
" -s Process stack size [readonly]\n"
" -t CPU usage [readonly]\n"
" -u Child processes\n"
#ifdef VMEM_DEF
" -v Process virtual memory [readonly]\n"
#endif
" -c Core dump file size\n"
" -n Number of file descriptors\n";
static struct ast_cli_entry cli_ulimit = {
{ "ulimit", NULL }, my_ulimit,
"Set or show process resource limits", ulimit_usage, complete_ulimit };
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_FAILURE: AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Resource limits");
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