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 = ASTERISK_GPL_KEY , .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 = ASTERISK_GPL_KEY , .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