Set process limits without restarting Asterisk

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@43463 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 159 insertions, 0 deletions

diff --git a/res/res_limit.c b/res/res_limit.c
new file mode 100644
index 000000000..6d5a2f90b
--- /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");
+