res_limit.c File Reference

Resource limits. More...

#include "asterisk.h"
#include <ctype.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "asterisk/module.h"
#include "asterisk/cli.h"

Include dependency graph for res_limit.c:

Go to the source code of this file.

Data Structures
struct	limits

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static char *	complete_ulimit (struct ast_cli_args *a)
static char *	handle_cli_ulimit (struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
static int	load_module (void)
static const char *	str2desc (const char *string)
static int	str2limit (const char *string)
static int	unload_module (void)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Resource limits" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_cli_entry	cli_ulimit
static const struct limits	limits []

Detailed Description

Resource limits.

Author

Tilghman Lesher res_l.nosp@m.imit.nosp@m._2006.nosp@m.07@t.nosp@m.he-ti.nosp@m.lghm.nosp@m.an.co.nosp@m.m

Definition in file res_limit.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 215 of file res_limit.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 215 of file res_limit.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 215 of file res_limit.c.

complete_ulimit()

static char * complete_ulimit ( struct ast_cli_args *  a )

static

Definition at line 86 of file res_limit.c.

{
    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;
}

References a, ARRAY_LEN, ast_strdup, and NULL.

Referenced by handle_cli_ulimit().

handle_cli_ulimit()

static char * handle_cli_ulimit ( struct ast_cli_entry *  e, int  cmd, struct ast_cli_args *  a  )

static

Definition at line 102 of file res_limit.c.

{
    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;
        }
    }
}

References a, ast_cli_args::argv, ARRAY_LEN, ast_cli(), ast_copy_string(), CLI_FAILURE, CLI_GENERATE, CLI_HANDLER, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, complete_ulimit(), desc, errno, handle_cli_ulimit(), NULL, str2desc(), str2limit(), and ast_cli_entry::usage.

Referenced by handle_cli_ulimit().

load_module()

static int load_module ( void  )

static

Definition at line 210 of file res_limit.c.

{
    return ast_cli_register(&cli_ulimit) ? AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS;
}

References ast_cli_register, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, and cli_ulimit.

str2desc()

static const char * str2desc ( const char *  string )

static

Definition at line 76 of file res_limit.c.

{
    size_t i;
    for (i = 0; i < ARRAY_LEN(limits); i++) {
        if (!strcmp(string, limits[i].clicmd))
            return limits[i].desc;
    }
    return "<unknown>";
}

References ARRAY_LEN, and desc.

Referenced by handle_cli_ulimit().

str2limit()

static int str2limit ( const char *  string )

static

Definition at line 66 of file res_limit.c.

{
    size_t i;
    for (i = 0; i < ARRAY_LEN(limits); i++) {
        if (!strcasecmp(string, limits[i].clicmd))
            return limits[i].resource;
    }
    return -1;
}

References ARRAY_LEN.

Referenced by handle_cli_ulimit().

unload_module()

static int unload_module ( void  )

static

Definition at line 205 of file res_limit.c.

{
    return ast_cli_unregister(&cli_ulimit);
}

References ast_cli_unregister(), and cli_ulimit.

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Resource limits" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }

static

Definition at line 215 of file res_limit.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 215 of file res_limit.c.

cli_ulimit

struct ast_cli_entry cli_ulimit

static

Initial value:

=
    { .handler =  handle_cli_ulimit , .summary =  "Set or show process resource limits" ,}

Definition at line 202 of file res_limit.c.

Referenced by load_module(), and unload_module().

limits

const struct limits limits[]

static