git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43658 65c4cc65-6c06-0410-ace0-fbb531ad65f3
162 lines
4.3 KiB
C
162 lines
4.3 KiB
C
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Resource limits
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*
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* Copyright (c) 2006 Tilghman Lesher. All rights reserved.
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*
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* Tilghman Lesher <res_limit_200607@the-tilghman.com>
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*
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* This code is released by the author with no restrictions on usage.
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*
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*/
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#include "asterisk.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define _XOPEN_SOURCE 600
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#include <string.h>
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#include <ctype.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <errno.h>
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#include "asterisk/module.h"
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#include "asterisk/cli.h"
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static struct limits {
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int resource;
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char limit[3];
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char desc[40];
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} limits[] = {
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{ RLIMIT_CPU, "-t", "cpu time" },
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{ RLIMIT_FSIZE, "-f", "file size" },
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{ RLIMIT_DATA, "-d", "program data segment" },
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{ RLIMIT_STACK, "-s", "program stack size" },
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{ RLIMIT_CORE, "-c", "core file size" },
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#ifdef RLIMIT_RSS
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{ RLIMIT_RSS, "-m", "resident memory" },
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{ RLIMIT_NPROC, "-u", "number of processes" },
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{ RLIMIT_MEMLOCK, "-l", "amount of memory locked into RAM" },
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#endif
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{ RLIMIT_NOFILE, "-n", "number of file descriptors" },
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{ RLIMIT_AS, "-v", "virtual memory" },
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};
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static int str2limit(const char *string)
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{
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size_t i;
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for (i = 0; i < sizeof(limits) / sizeof(limits[0]); i++) {
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if (!strcasecmp(string, limits[i].limit))
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return limits[i].resource;
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}
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return -1;
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}
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static const char *str2desc(const char *string)
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{
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size_t i;
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for (i = 0; i < sizeof(limits) / sizeof(limits[0]); i++) {
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if (!strcmp(string, limits[i].limit))
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return limits[i].desc;
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}
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return "<unknown>";
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}
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static int my_ulimit(int fd, int argc, char **argv)
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{
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int resource;
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struct rlimit rlimit = { 0, 0 };
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if (argc > 3)
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return RESULT_SHOWUSAGE;
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if (argc == 1) {
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char arg2[3];
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char *newargv[2] = { "ulimit", arg2 };
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for (resource = 0; resource < sizeof(limits) / sizeof(limits[0]); resource++) {
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ast_copy_string(arg2, limits[resource].limit, sizeof(arg2));
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my_ulimit(fd, 2, newargv);
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}
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return RESULT_SUCCESS;
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} else {
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resource = str2limit(argv[1]);
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if (resource == -1) {
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ast_cli(fd, "Unknown resource\n");
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return RESULT_FAILURE;
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}
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if (argc == 3) {
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if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_NPROC && resource != RLIMIT_FSIZE) {
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ast_cli(fd, "Resource not permitted to be set\n");
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return RESULT_FAILURE;
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}
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sscanf(argv[2], "%d", (int *)&rlimit.rlim_cur);
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rlimit.rlim_max = rlimit.rlim_cur;
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setrlimit(resource, &rlimit);
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return RESULT_SUCCESS;
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} else {
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if (!getrlimit(resource, &rlimit)) {
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char printlimit[32];
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const char *desc;
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if (rlimit.rlim_max == RLIM_INFINITY)
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ast_copy_string(printlimit, "effectively unlimited", sizeof(printlimit));
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else
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snprintf(printlimit, sizeof(printlimit), "limited to %d", (int)rlimit.rlim_cur);
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desc = str2desc(argv[1]);
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ast_cli(fd, "%c%s (%s) is %s.\n", toupper(desc[0]), desc + 1, argv[1], printlimit);
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} else
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ast_cli(fd, "Could not retrieve resource limits for %s: %s\n", str2desc(argv[1]), strerror(errno));
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return RESULT_SUCCESS;
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}
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}
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}
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static char *complete_ulimit(const char *line, const char *word, int pos, int state)
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{
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int which = 0, i;
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int wordlen = strlen(word);
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if (pos > 2)
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return NULL;
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for (i = 0; i < sizeof(limits) / sizeof(limits[0]); i++) {
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if (!strncasecmp(limits[i].limit, word, wordlen)) {
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if (++which > state)
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return ast_strdup(limits[i].limit);
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}
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}
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return NULL;
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}
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static char ulimit_usage[] =
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"Usage: ulimit {-d|-l|-f|-m|-s|-t|-u|-v|-c|-n} [<num>]\n"
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" Shows or sets the corresponding resource limit.\n"
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" -d Process data segment [readonly]\n"
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" -l Memory lock size [readonly]\n"
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" -f File size\n"
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" -m Process resident memory [readonly]\n"
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" -s Process stack size [readonly]\n"
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" -t CPU usage [readonly]\n"
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" -u Child processes\n"
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" -v Process virtual memory [readonly]\n"
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" -c Core dump file size\n"
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" -n Number of file descriptors\n";
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static struct ast_cli_entry cli_ulimit = {
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{ "ulimit", NULL }, my_ulimit,
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"Set or show process resource limits", ulimit_usage, complete_ulimit };
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static int unload_module(void)
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{
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return ast_cli_unregister(&cli_ulimit);
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}
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static int load_module(void)
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{
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return ast_cli_register(&cli_ulimit)? AST_MODULE_LOAD_FAILURE: AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Resource limits");
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