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00025 #include "asterisk.h"
00026
00027 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 328209 $")
00028
00029 #include <ctype.h>
00030 #include <sys/time.h>
00031 #include <sys/resource.h>
00032 #include "asterisk/module.h"
00033 #include "asterisk/cli.h"
00034
00035
00036 #ifdef RLIMIT_AS
00037 #define VMEM_DEF RLIMIT_AS
00038 #else
00039 #ifdef RLIMIT_VMEM
00040 #define VMEM_DEF RLIMIT_VMEM
00041 #endif
00042 #endif
00043
00044 static const struct limits {
00045 int resource;
00046 char limit[3];
00047 char desc[40];
00048 char clicmd[15];
00049 } limits[] = {
00050 { RLIMIT_CPU, "-t", "cpu time", "time" },
00051 { RLIMIT_FSIZE, "-f", "file size" , "file" },
00052 { RLIMIT_DATA, "-d", "program data segment", "data" },
00053 { RLIMIT_STACK, "-s", "program stack size", "stack" },
00054 { RLIMIT_CORE, "-c", "core file size", "core" },
00055 #ifdef RLIMIT_RSS
00056 { RLIMIT_RSS, "-m", "resident memory", "memory" },
00057 { RLIMIT_MEMLOCK, "-l", "amount of memory locked into RAM", "locked" },
00058 #endif
00059 #ifdef RLIMIT_NPROC
00060 { RLIMIT_NPROC, "-u", "number of processes", "processes" },
00061 #endif
00062 { RLIMIT_NOFILE, "-n", "number of file descriptors", "descriptors" },
00063 #ifdef VMEM_DEF
00064 { VMEM_DEF, "-v", "virtual memory", "virtual" },
00065 #endif
00066 };
00067
00068 static int str2limit(const char *string)
00069 {
00070 size_t i;
00071 for (i = 0; i < ARRAY_LEN(limits); i++) {
00072 if (!strcasecmp(string, limits[i].clicmd))
00073 return limits[i].resource;
00074 }
00075 return -1;
00076 }
00077
00078 static const char *str2desc(const char *string)
00079 {
00080 size_t i;
00081 for (i = 0; i < ARRAY_LEN(limits); i++) {
00082 if (!strcmp(string, limits[i].clicmd))
00083 return limits[i].desc;
00084 }
00085 return "<unknown>";
00086 }
00087
00088 static char *complete_ulimit(struct ast_cli_args *a)
00089 {
00090 int which = 0, i;
00091 int wordlen = strlen(a->word);
00092
00093 if (a->pos > 1)
00094 return NULL;
00095 for (i = 0; i < ARRAY_LEN(limits); i++) {
00096 if (!strncasecmp(limits[i].clicmd, a->word, wordlen)) {
00097 if (++which > a->n)
00098 return ast_strdup(limits[i].clicmd);
00099 }
00100 }
00101 return NULL;
00102 }
00103
00104 static char *handle_cli_ulimit(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00105 {
00106 int resource;
00107 struct rlimit rlimit = { 0, 0 };
00108
00109 switch (cmd) {
00110 case CLI_INIT:
00111 e->command = "ulimit";
00112 e->usage =
00113 "Usage: ulimit {data|"
00114 #ifdef RLIMIT_RSS
00115 "limit|"
00116 #endif
00117 "file|"
00118 #ifdef RLIMIT_RSS
00119 "memory|"
00120 #endif
00121 "stack|time|"
00122 #ifdef RLIMIT_NPROC
00123 "processes|"
00124 #endif
00125 #ifdef VMEM_DEF
00126 "virtual|"
00127 #endif
00128 "core|descriptors} [<num>]\n"
00129 " Shows or sets the corresponding resource limit.\n"
00130 " data Process data segment [readonly]\n"
00131 #ifdef RLIMIT_RSS
00132 " lock Memory lock size [readonly]\n"
00133 #endif
00134 " file File size\n"
00135 #ifdef RLIMIT_RSS
00136 " memory Process resident memory [readonly]\n"
00137 #endif
00138 " stack Process stack size [readonly]\n"
00139 " time CPU usage [readonly]\n"
00140 #ifdef RLIMIT_NPROC
00141 " processes Child processes\n"
00142 #endif
00143 #ifdef VMEM_DEF
00144 " virtual Process virtual memory [readonly]\n"
00145 #endif
00146 " core Core dump file size\n"
00147 " descriptors Number of file descriptors\n";
00148 return NULL;
00149 case CLI_GENERATE:
00150 return complete_ulimit(a);
00151 }
00152
00153 if (a->argc > 3)
00154 return CLI_SHOWUSAGE;
00155
00156 if (a->argc == 1) {
00157 char arg2[15];
00158 const char * const newargv[2] = { "ulimit", arg2 };
00159 for (resource = 0; resource < ARRAY_LEN(limits); resource++) {
00160 struct ast_cli_args newArgs = { .argv = newargv, .argc = 2 };
00161 ast_copy_string(arg2, limits[resource].clicmd, sizeof(arg2));
00162 handle_cli_ulimit(e, CLI_HANDLER, &newArgs);
00163 }
00164 return CLI_SUCCESS;
00165 } else {
00166 resource = str2limit(a->argv[1]);
00167 if (resource == -1) {
00168 ast_cli(a->fd, "Unknown resource\n");
00169 return CLI_FAILURE;
00170 }
00171
00172 if (a->argc == 3) {
00173 int x;
00174 #ifdef RLIMIT_NPROC
00175 if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_NPROC && resource != RLIMIT_FSIZE) {
00176 #else
00177 if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_FSIZE) {
00178 #endif
00179 ast_cli(a->fd, "Resource not permitted to be set\n");
00180 return CLI_FAILURE;
00181 }
00182
00183 sscanf(a->argv[2], "%30d", &x);
00184 rlimit.rlim_max = rlimit.rlim_cur = x;
00185 setrlimit(resource, &rlimit);
00186 return CLI_SUCCESS;
00187 } else {
00188 if (!getrlimit(resource, &rlimit)) {
00189 char printlimit[32];
00190 const char *desc;
00191 if (rlimit.rlim_max == RLIM_INFINITY)
00192 ast_copy_string(printlimit, "effectively unlimited", sizeof(printlimit));
00193 else
00194 snprintf(printlimit, sizeof(printlimit), "limited to %d", (int) rlimit.rlim_cur);
00195 desc = str2desc(a->argv[1]);
00196 ast_cli(a->fd, "%c%s (%s) is %s.\n", toupper(desc[0]), desc + 1, a->argv[1], printlimit);
00197 } else
00198 ast_cli(a->fd, "Could not retrieve resource limits for %s: %s\n", str2desc(a->argv[1]), strerror(errno));
00199 return CLI_SUCCESS;
00200 }
00201 }
00202 }
00203
00204 static struct ast_cli_entry cli_ulimit =
00205 AST_CLI_DEFINE(handle_cli_ulimit, "Set or show process resource limits");
00206
00207 static int unload_module(void)
00208 {
00209 return ast_cli_unregister(&cli_ulimit);
00210 }
00211
00212 static int load_module(void)
00213 {
00214 return ast_cli_register(&cli_ulimit) ? AST_MODULE_LOAD_FAILURE : AST_MODULE_LOAD_SUCCESS;
00215 }
00216
00217 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Resource limits");
00218