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00022 #include "asterisk.h"
00023
00024 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 217035 $")
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 struct limits {
00042 int resource;
00043 char limit[3];
00044 char desc[40];
00045 } limits[] = {
00046 { RLIMIT_CPU, "-t", "cpu time" },
00047 { RLIMIT_FSIZE, "-f", "file size" },
00048 { RLIMIT_DATA, "-d", "program data segment" },
00049 { RLIMIT_STACK, "-s", "program stack size" },
00050 { RLIMIT_CORE, "-c", "core file size" },
00051 #ifdef RLIMIT_RSS
00052 { RLIMIT_RSS, "-m", "resident memory" },
00053 { RLIMIT_MEMLOCK, "-l", "amount of memory locked into RAM" },
00054 #endif
00055 #ifdef RLIMIT_NPROC
00056 { RLIMIT_NPROC, "-u", "number of processes" },
00057 #endif
00058 { RLIMIT_NOFILE, "-n", "number of file descriptors" },
00059 #ifdef VMEM_DEF
00060 { VMEM_DEF, "-v", "virtual memory" },
00061 #endif
00062 };
00063
00064 static int str2limit(const char *string)
00065 {
00066 size_t i;
00067 for (i = 0; i < ARRAY_LEN(limits); i++) {
00068 if (!strcasecmp(string, limits[i].limit))
00069 return limits[i].resource;
00070 }
00071 return -1;
00072 }
00073
00074 static const char *str2desc(const char *string)
00075 {
00076 size_t i;
00077 for (i = 0; i < ARRAY_LEN(limits); i++) {
00078 if (!strcmp(string, limits[i].limit))
00079 return limits[i].desc;
00080 }
00081 return "<unknown>";
00082 }
00083
00084 static char *complete_ulimit(struct ast_cli_args *a)
00085 {
00086 int which = 0, i;
00087 int wordlen = strlen(a->word);
00088
00089 if (a->pos > 1)
00090 return NULL;
00091 for (i = 0; i < ARRAY_LEN(limits); i++) {
00092 if (!strncasecmp(limits[i].limit, a->word, wordlen)) {
00093 if (++which > a->n)
00094 return ast_strdup(limits[i].limit);
00095 }
00096 }
00097 return NULL;
00098 }
00099
00100 static char *handle_cli_ulimit(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00101 {
00102 int resource;
00103 struct rlimit rlimit = { 0, 0 };
00104
00105 switch (cmd) {
00106 case CLI_INIT:
00107 e->command = "ulimit";
00108 e->usage =
00109 "Usage: ulimit {-d|"
00110 #ifdef RLIMIT_RSS
00111 "-l|"
00112 #endif
00113 "-f|"
00114 #ifdef RLIMIT_RSS
00115 "-m|"
00116 #endif
00117 "-s|-t|"
00118 #ifdef RLIMIT_NPROC
00119 "-u|"
00120 #endif
00121 #ifdef VMEM_DEF
00122 "-v|"
00123 #endif
00124 "-c|-n} [<num>]\n"
00125 " Shows or sets the corresponding resource limit.\n"
00126 " -d Process data segment [readonly]\n"
00127 #ifdef RLIMIT_RSS
00128 " -l Memory lock size [readonly]\n"
00129 #endif
00130 " -f File size\n"
00131 #ifdef RLIMIT_RSS
00132 " -m Process resident memory [readonly]\n"
00133 #endif
00134 " -s Process stack size [readonly]\n"
00135 " -t CPU usage [readonly]\n"
00136 #ifdef RLIMIT_NPROC
00137 " -u Child processes\n"
00138 #endif
00139 #ifdef VMEM_DEF
00140 " -v Process virtual memory [readonly]\n"
00141 #endif
00142 " -c Core dump file size\n"
00143 " -n Number of file descriptors\n";
00144 return NULL;
00145 case CLI_GENERATE:
00146 return complete_ulimit(a);
00147 }
00148
00149 if (a->argc > 3)
00150 return CLI_SHOWUSAGE;
00151
00152 if (a->argc == 1) {
00153 char arg2[3];
00154 char *newargv[2] = { "ulimit", arg2 };
00155 for (resource = 0; resource < ARRAY_LEN(limits); resource++) {
00156 struct ast_cli_args newArgs = { .argv = newargv, .argc = 2 };
00157 ast_copy_string(arg2, limits[resource].limit, sizeof(arg2));
00158 handle_cli_ulimit(e, CLI_HANDLER, &newArgs);
00159 }
00160 return CLI_SUCCESS;
00161 } else {
00162 resource = str2limit(a->argv[1]);
00163 if (resource == -1) {
00164 ast_cli(a->fd, "Unknown resource\n");
00165 return CLI_FAILURE;
00166 }
00167
00168 if (a->argc == 3) {
00169 int x;
00170 #ifdef RLIMIT_NPROC
00171 if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_NPROC && resource != RLIMIT_FSIZE) {
00172 #else
00173 if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_FSIZE) {
00174 #endif
00175 ast_cli(a->fd, "Resource not permitted to be set\n");
00176 return CLI_FAILURE;
00177 }
00178
00179 sscanf(a->argv[2], "%30d", &x);
00180 rlimit.rlim_max = rlimit.rlim_cur = x;
00181 setrlimit(resource, &rlimit);
00182 return CLI_SUCCESS;
00183 } else {
00184 if (!getrlimit(resource, &rlimit)) {
00185 char printlimit[32];
00186 const char *desc;
00187 if (rlimit.rlim_max == RLIM_INFINITY)
00188 ast_copy_string(printlimit, "effectively unlimited", sizeof(printlimit));
00189 else
00190 snprintf(printlimit, sizeof(printlimit), "limited to %d", (int) rlimit.rlim_cur);
00191 desc = str2desc(a->argv[1]);
00192 ast_cli(a->fd, "%c%s (%s) is %s.\n", toupper(desc[0]), desc + 1, a->argv[1], printlimit);
00193 } else
00194 ast_cli(a->fd, "Could not retrieve resource limits for %s: %s\n", str2desc(a->argv[1]), strerror(errno));
00195 return CLI_SUCCESS;
00196 }
00197 }
00198 }
00199
00200 static struct ast_cli_entry cli_ulimit =
00201 AST_CLI_DEFINE(handle_cli_ulimit, "Set or show process resource limits");
00202
00203 static int unload_module(void)
00204 {
00205 return ast_cli_unregister(&cli_ulimit);
00206 }
00207
00208 static int load_module(void)
00209 {
00210 return ast_cli_register(&cli_ulimit) ? AST_MODULE_LOAD_FAILURE : AST_MODULE_LOAD_SUCCESS;
00211 }
00212
00213 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Resource limits");
00214