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00022 #include "asterisk.h"
00023
00024 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 217033 $")
00025
00026 #include <ctype.h>
00027 #include <sys/time.h>
00028 #include <sys/resource.h>
00029 #include "asterisk/module.h"
00030 #include "asterisk/cli.h"
00031
00032
00033 #ifdef RLIMIT_AS
00034 #define VMEM_DEF RLIMIT_AS
00035 #else
00036 #ifdef RLIMIT_VMEM
00037 #define VMEM_DEF RLIMIT_VMEM
00038 #endif
00039 #endif
00040
00041 static const struct limits {
00042 int resource;
00043 char limit[3];
00044 char desc[40];
00045 char clicmd[15];
00046 } limits[] = {
00047 { RLIMIT_CPU, "-t", "cpu time", "time" },
00048 { RLIMIT_FSIZE, "-f", "file size" , "file" },
00049 { RLIMIT_DATA, "-d", "program data segment", "data" },
00050 { RLIMIT_STACK, "-s", "program stack size", "stack" },
00051 { RLIMIT_CORE, "-c", "core file size", "core" },
00052 #ifdef RLIMIT_RSS
00053 { RLIMIT_RSS, "-m", "resident memory", "memory" },
00054 { RLIMIT_MEMLOCK, "-l", "amount of memory locked into RAM", "locked" },
00055 #endif
00056 #ifdef RLIMIT_NPROC
00057 { RLIMIT_NPROC, "-u", "number of processes", "processes" },
00058 #endif
00059 { RLIMIT_NOFILE, "-n", "number of file descriptors", "descriptors" },
00060 #ifdef VMEM_DEF
00061 { VMEM_DEF, "-v", "virtual memory", "virtual" },
00062 #endif
00063 };
00064
00065 static int str2limit(const char *string)
00066 {
00067 size_t i;
00068 for (i = 0; i < ARRAY_LEN(limits); i++) {
00069 if (!strcasecmp(string, limits[i].clicmd))
00070 return limits[i].resource;
00071 }
00072 return -1;
00073 }
00074
00075 static const char *str2desc(const char *string)
00076 {
00077 size_t i;
00078 for (i = 0; i < ARRAY_LEN(limits); i++) {
00079 if (!strcmp(string, limits[i].clicmd))
00080 return limits[i].desc;
00081 }
00082 return "<unknown>";
00083 }
00084
00085 static char *complete_ulimit(struct ast_cli_args *a)
00086 {
00087 int which = 0, i;
00088 int wordlen = strlen(a->word);
00089
00090 if (a->pos > 1)
00091 return NULL;
00092 for (i = 0; i < ARRAY_LEN(limits); i++) {
00093 if (!strncasecmp(limits[i].clicmd, a->word, wordlen)) {
00094 if (++which > a->n)
00095 return ast_strdup(limits[i].clicmd);
00096 }
00097 }
00098 return NULL;
00099 }
00100
00101 static char *handle_cli_ulimit(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00102 {
00103 int resource;
00104 struct rlimit rlimit = { 0, 0 };
00105
00106 switch (cmd) {
00107 case CLI_INIT:
00108 e->command = "ulimit";
00109 e->usage =
00110 "Usage: ulimit {data|"
00111 #ifdef RLIMIT_RSS
00112 "limit|"
00113 #endif
00114 "file|"
00115 #ifdef RLIMIT_RSS
00116 "memory|"
00117 #endif
00118 "stack|time|"
00119 #ifdef RLIMIT_NPROC
00120 "processes|"
00121 #endif
00122 #ifdef VMEM_DEF
00123 "virtual|"
00124 #endif
00125 "core|descriptors} [<num>]\n"
00126 " Shows or sets the corresponding resource limit.\n"
00127 " data Process data segment [readonly]\n"
00128 #ifdef RLIMIT_RSS
00129 " lock Memory lock size [readonly]\n"
00130 #endif
00131 " file File size\n"
00132 #ifdef RLIMIT_RSS
00133 " memory Process resident memory [readonly]\n"
00134 #endif
00135 " stack Process stack size [readonly]\n"
00136 " time CPU usage [readonly]\n"
00137 #ifdef RLIMIT_NPROC
00138 " processes Child processes\n"
00139 #endif
00140 #ifdef VMEM_DEF
00141 " virtual Process virtual memory [readonly]\n"
00142 #endif
00143 " core Core dump file size\n"
00144 " descriptors Number of file descriptors\n";
00145 return NULL;
00146 case CLI_GENERATE:
00147 return complete_ulimit(a);
00148 }
00149
00150 if (a->argc > 3)
00151 return CLI_SHOWUSAGE;
00152
00153 if (a->argc == 1) {
00154 char arg2[15];
00155 const char * const newargv[2] = { "ulimit", arg2 };
00156 for (resource = 0; resource < ARRAY_LEN(limits); resource++) {
00157 struct ast_cli_args newArgs = { .argv = newargv, .argc = 2 };
00158 ast_copy_string(arg2, limits[resource].clicmd, sizeof(arg2));
00159 handle_cli_ulimit(e, CLI_HANDLER, &newArgs);
00160 }
00161 return CLI_SUCCESS;
00162 } else {
00163 resource = str2limit(a->argv[1]);
00164 if (resource == -1) {
00165 ast_cli(a->fd, "Unknown resource\n");
00166 return CLI_FAILURE;
00167 }
00168
00169 if (a->argc == 3) {
00170 int x;
00171 #ifdef RLIMIT_NPROC
00172 if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_NPROC && resource != RLIMIT_FSIZE) {
00173 #else
00174 if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_FSIZE) {
00175 #endif
00176 ast_cli(a->fd, "Resource not permitted to be set\n");
00177 return CLI_FAILURE;
00178 }
00179
00180 sscanf(a->argv[2], "%30d", &x);
00181 rlimit.rlim_max = rlimit.rlim_cur = x;
00182 setrlimit(resource, &rlimit);
00183 return CLI_SUCCESS;
00184 } else {
00185 if (!getrlimit(resource, &rlimit)) {
00186 char printlimit[32];
00187 const char *desc;
00188 if (rlimit.rlim_max == RLIM_INFINITY)
00189 ast_copy_string(printlimit, "effectively unlimited", sizeof(printlimit));
00190 else
00191 snprintf(printlimit, sizeof(printlimit), "limited to %d", (int) rlimit.rlim_cur);
00192 desc = str2desc(a->argv[1]);
00193 ast_cli(a->fd, "%c%s (%s) is %s.\n", toupper(desc[0]), desc + 1, a->argv[1], printlimit);
00194 } else
00195 ast_cli(a->fd, "Could not retrieve resource limits for %s: %s\n", str2desc(a->argv[1]), strerror(errno));
00196 return CLI_SUCCESS;
00197 }
00198 }
00199 }
00200
00201 static struct ast_cli_entry cli_ulimit =
00202 AST_CLI_DEFINE(handle_cli_ulimit, "Set or show process resource limits");
00203
00204 static int unload_module(void)
00205 {
00206 return ast_cli_unregister(&cli_ulimit);
00207 }
00208
00209 static int load_module(void)
00210 {
00211 return ast_cli_register(&cli_ulimit) ? AST_MODULE_LOAD_FAILURE : AST_MODULE_LOAD_SUCCESS;
00212 }
00213
00214 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Resource limits");
00215