From e406a2478a1b9783ee74f2bb501f9a82b08715e9 Mon Sep 17 00:00:00 2001
From: Tilghman Lesher <tilghman@meg.abyt.es>
Date: Thu, 21 Sep 2006 23:01:00 +0000
Subject: [PATCH] Set process limits without restarting Asterisk
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43463 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
res/res_limit.c | 159 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 159 insertions(+)
create mode 100644 res/res_limit.c
diff --git a/res/res_limit.c b/res/res_limit.c
new file mode 100644
index 0000000000..6d5a2f90bd
--- /dev/null
+++ b/res/res_limit.c
@@ -0,0 +1,159 @@
+/*
+ * 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.
+ *
+ */
+
+#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"
+
+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" },
+ { RLIMIT_RSS, "-m", "resident memory" },
+ { RLIMIT_NOFILE, "-n", "number of file descriptors" },
+ { RLIMIT_AS, "-v", "virtual memory" },
+ { RLIMIT_NPROC, "-u", "number of processes" },
+ { RLIMIT_MEMLOCK, "-l", "amount of memory locked into RAM" },
+};
+
+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) {
+ 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", (int *)&rlimit.rlim_cur);
+ rlimit.rlim_max = rlimit.rlim_cur;
+ 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 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"
+" -v Process virtual memory [readonly]\n"
+" -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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