Modules/resource.c

   1
   2 #include "Python.h"
   3 #include "structseq.h"
   4 #include <sys/resource.h>
   5 #include <sys/time.h>
   6 #include <string.h>
   7 #include <errno.h>
   8 /* for sysconf */
   9 #if defined(HAVE_UNISTD_H)
  10 #include <unistd.h>
  11 #endif
  12
  13 /* On some systems, these aren't in any header file.
  14    On others they are, with inconsistent prototypes.
  15    We declare the (default) return type, to shut up gcc -Wall;
  16    but we can't declare the prototype, to avoid errors
  17    when the header files declare it different.
  18    Worse, on some Linuxes, getpagesize() returns a size_t... */
  19
  20 #define doubletime(TV) ((double)(TV).tv_sec + (TV).tv_usec * 0.000001)
  21
  22 static PyObject *ResourceError;
  23
  24 PyDoc_STRVAR(struct_rusage__doc__,
  25 "struct_rusage: Result from getrusage.\n\n"
  26 "This object may be accessed either as a tuple of\n"
  27 "    (utime,stime,maxrss,ixrss,idrss,isrss,minflt,majflt,\n"
  28 "    nswap,inblock,oublock,msgsnd,msgrcv,nsignals,nvcsw,nivcsw)\n"
  29 "or via the attributes ru_utime, ru_stime, ru_maxrss, and so on.");
  30
  31 static PyStructSequence_Field struct_rusage_fields[] = {
  32         {"ru_utime",    "user time used"},
  33         {"ru_stime",    "system time used"},
  34         {"ru_maxrss",   "max. resident set size"},
  35         {"ru_ixrss",    "shared memory size"},
  36         {"ru_idrss",    "unshared data size"},
  37         {"ru_isrss",    "unshared stack size"},
  38         {"ru_minflt",   "page faults not requiring I/O"},
  39         {"ru_majflt",   "page faults requiring I/O"},
  40         {"ru_nswap",    "number of swap outs"},
  41         {"ru_inblock",  "block input operations"},
  42         {"ru_oublock",  "block output operations"},
  43         {"ru_msgsnd",   "IPC messages sent"},
  44         {"ru_msgrcv",   "IPC messages received"},
  45         {"ru_nsignals", "signals received"},
  46         {"ru_nvcsw",    "voluntary context switches"},
  47         {"ru_nivcsw",   "involuntary context switches"},
  48         {0}
  49 };
  50
  51 static PyStructSequence_Desc struct_rusage_desc = {
  52         "resource.struct_rusage",       /* name */
  53         struct_rusage__doc__,   /* doc */
  54         struct_rusage_fields,   /* fields */
  55         16      /* n_in_sequence */
  56 };
  57
  58 static int initialized;
  59 static PyTypeObject StructRUsageType;
  60
  61 static PyObject *
  62 resource_getrusage(PyObject *self, PyObject *args)
  63 {
  64         int who;
  65         struct rusage ru;
  66         PyObject *result;
  67
  68         if (!PyArg_ParseTuple(args, "i:getrusage", &who))
  69                 return NULL;
  70
  71         if (getrusage(who, &ru) == -1) {
  72                 if (errno == EINVAL) {
  73                         PyErr_SetString(PyExc_ValueError,
  74                                         "invalid who parameter");
  75                         return NULL;
  76                 }
  77                 PyErr_SetFromErrno(ResourceError);
  78                 return NULL;
  79         }
  80
  81         result = PyStructSequence_New(&StructRUsageType);
  82         if (!result)
  83                 return NULL;
  84
  85         PyStructSequence_SET_ITEM(result, 0,
  86                         PyFloat_FromDouble(doubletime(ru.ru_utime)));
  87         PyStructSequence_SET_ITEM(result, 1,
  88                         PyFloat_FromDouble(doubletime(ru.ru_stime)));
  89         PyStructSequence_SET_ITEM(result, 2, PyInt_FromLong(ru.ru_maxrss));
  90         PyStructSequence_SET_ITEM(result, 3, PyInt_FromLong(ru.ru_ixrss));
  91         PyStructSequence_SET_ITEM(result, 4, PyInt_FromLong(ru.ru_idrss));
  92         PyStructSequence_SET_ITEM(result, 5, PyInt_FromLong(ru.ru_isrss));
  93         PyStructSequence_SET_ITEM(result, 6, PyInt_FromLong(ru.ru_minflt));
  94         PyStructSequence_SET_ITEM(result, 7, PyInt_FromLong(ru.ru_majflt));
  95         PyStructSequence_SET_ITEM(result, 8, PyInt_FromLong(ru.ru_nswap));
  96         PyStructSequence_SET_ITEM(result, 9, PyInt_FromLong(ru.ru_inblock));
  97         PyStructSequence_SET_ITEM(result, 10, PyInt_FromLong(ru.ru_oublock));
  98         PyStructSequence_SET_ITEM(result, 11, PyInt_FromLong(ru.ru_msgsnd));
  99         PyStructSequence_SET_ITEM(result, 12, PyInt_FromLong(ru.ru_msgrcv));
 100         PyStructSequence_SET_ITEM(result, 13, PyInt_FromLong(ru.ru_nsignals));
 101         PyStructSequence_SET_ITEM(result, 14, PyInt_FromLong(ru.ru_nvcsw));
 102         PyStructSequence_SET_ITEM(result, 15, PyInt_FromLong(ru.ru_nivcsw));
 103
 104         if (PyErr_Occurred()) {
 105                 Py_DECREF(result);
 106                 return NULL;
 107         }
 108
 109         return result;
 110 }
 111
 112
 113 static PyObject *
 114 resource_getrlimit(PyObject *self, PyObject *args)
 115 {
 116         struct rlimit rl;
 117         int resource;
 118
 119         if (!PyArg_ParseTuple(args, "i:getrlimit", &resource))
 120                 return NULL;
 121
 122         if (resource < 0 || resource >= RLIM_NLIMITS) {
 123                 PyErr_SetString(PyExc_ValueError,
 124                                 "invalid resource specified");
 125                 return NULL;
 126         }
 127
 128         if (getrlimit(resource, &rl) == -1) {
 129                 PyErr_SetFromErrno(ResourceError);
 130                 return NULL;
 131         }
 132
 133 #if defined(HAVE_LONG_LONG)
 134         if (sizeof(rl.rlim_cur) > sizeof(long)) {
 135                 return Py_BuildValue("LL",
 136                                      (PY_LONG_LONG) rl.rlim_cur,
 137                                      (PY_LONG_LONG) rl.rlim_max);
 138         }
 139 #endif
 140         return Py_BuildValue("ll", (long) rl.rlim_cur, (long) rl.rlim_max);
 141 }
 142
 143 static PyObject *
 144 resource_setrlimit(PyObject *self, PyObject *args)
 145 {
 146         struct rlimit rl;
 147         int resource;
 148         PyObject *curobj, *maxobj;
 149
 150         if (!PyArg_ParseTuple(args, "i(OO):setrlimit",
 151                               &resource, &curobj, &maxobj))
 152                 return NULL;
 153
 154         if (resource < 0 || resource >= RLIM_NLIMITS) {
 155                 PyErr_SetString(PyExc_ValueError,
 156                                 "invalid resource specified");
 157                 return NULL;
 158         }
 159
 160 #if !defined(HAVE_LARGEFILE_SUPPORT)
 161         rl.rlim_cur = PyInt_AsLong(curobj);
 162         if (rl.rlim_cur == (rlim_t)-1 && PyErr_Occurred())
 163             return NULL;
 164         rl.rlim_max = PyInt_AsLong(maxobj);
 165         if (rl.rlim_max == (rlim_t)-1 && PyErr_Occurred())
 166             return NULL;
 167 #else
 168         /* The limits are probably bigger than a long */
 169         rl.rlim_cur = PyLong_Check(curobj) ?
 170                 PyLong_AsLongLong(curobj) : PyInt_AsLong(curobj);
 171         if (rl.rlim_cur == (rlim_t)-1 && PyErr_Occurred())
 172             return NULL;
 173         rl.rlim_max = PyLong_Check(maxobj) ?
 174                 PyLong_AsLongLong(maxobj) : PyInt_AsLong(maxobj);
 175         if (rl.rlim_max == (rlim_t)-1 && PyErr_Occurred())
 176             return NULL;
 177 #endif
 178
 179         rl.rlim_cur = rl.rlim_cur & RLIM_INFINITY;
 180         rl.rlim_max = rl.rlim_max & RLIM_INFINITY;
 181         if (setrlimit(resource, &rl) == -1) {
 182                 if (errno == EINVAL)
 183                         PyErr_SetString(PyExc_ValueError,
 184                                         "current limit exceeds maximum limit");
 185                 else if (errno == EPERM)
 186                         PyErr_SetString(PyExc_ValueError,
 187                                         "not allowed to raise maximum limit");
 188                 else
 189                         PyErr_SetFromErrno(ResourceError);
 190                 return NULL;
 191         }
 192         Py_INCREF(Py_None);
 193         return Py_None;
 194 }
 195
 196 static PyObject *
 197 resource_getpagesize(PyObject *self, PyObject *unused)
 198 {
 199         long pagesize = 0;
 200 #if defined(HAVE_GETPAGESIZE)
 201         pagesize = getpagesize();
 202 #elif defined(HAVE_SYSCONF)
 203 #if defined(_SC_PAGE_SIZE)
 204         pagesize = sysconf(_SC_PAGE_SIZE);
 205 #else
 206         /* Irix 5.3 has _SC_PAGESIZE, but not _SC_PAGE_SIZE */
 207         pagesize = sysconf(_SC_PAGESIZE);
 208 #endif
 209 #endif
 210         return Py_BuildValue("i", pagesize);
 211
 212 }
 213
 214 /* List of functions */
 215
 216 static struct PyMethodDef
 217 resource_methods[] = {
 218         {"getrusage",    resource_getrusage,   METH_VARARGS},
 219         {"getrlimit",    resource_getrlimit,   METH_VARARGS},
 220         {"setrlimit",    resource_setrlimit,   METH_VARARGS},
 221         {"getpagesize",  resource_getpagesize, METH_NOARGS},
 222         {NULL, NULL}                         /* sentinel */
 223 };
 224
 225
 226 /* Module initialization */
 227
 228 PyMODINIT_FUNC
 229 initresource(void)
 230 {
 231         PyObject *m, *v;
 232
 233         /* Create the module and add the functions */
 234         m = Py_InitModule("resource", resource_methods);
 235         if (m == NULL)
 236                 return;
 237
 238         /* Add some symbolic constants to the module */
 239         if (ResourceError == NULL) {
 240                 ResourceError = PyErr_NewException("resource.error",
 241                                                    NULL, NULL);
 242         }
 243         Py_INCREF(ResourceError);
 244         PyModule_AddObject(m, "error", ResourceError);
 245         if (!initialized)
 246                 PyStructSequence_InitType(&StructRUsageType,
 247                                           &struct_rusage_desc);
 248         Py_INCREF(&StructRUsageType);
 249         PyModule_AddObject(m, "struct_rusage",
 250                            (PyObject*) &StructRUsageType);
 251
 252         /* insert constants */
 253 #ifdef RLIMIT_CPU
 254         PyModule_AddIntConstant(m, "RLIMIT_CPU", RLIMIT_CPU);
 255 #endif
 256
 257 #ifdef RLIMIT_FSIZE
 258         PyModule_AddIntConstant(m, "RLIMIT_FSIZE", RLIMIT_FSIZE);
 259 #endif
 260
 261 #ifdef RLIMIT_DATA
 262         PyModule_AddIntConstant(m, "RLIMIT_DATA", RLIMIT_DATA);
 263 #endif
 264
 265 #ifdef RLIMIT_STACK
 266         PyModule_AddIntConstant(m, "RLIMIT_STACK", RLIMIT_STACK);
 267 #endif
 268
 269 #ifdef RLIMIT_CORE
 270         PyModule_AddIntConstant(m, "RLIMIT_CORE", RLIMIT_CORE);
 271 #endif
 272
 273 #ifdef RLIMIT_NOFILE
 274         PyModule_AddIntConstant(m, "RLIMIT_NOFILE", RLIMIT_NOFILE);
 275 #endif
 276
 277 #ifdef RLIMIT_OFILE
 278         PyModule_AddIntConstant(m, "RLIMIT_OFILE", RLIMIT_OFILE);
 279 #endif
 280
 281 #ifdef RLIMIT_VMEM
 282         PyModule_AddIntConstant(m, "RLIMIT_VMEM", RLIMIT_VMEM);
 283 #endif
 284
 285 #ifdef RLIMIT_AS
 286         PyModule_AddIntConstant(m, "RLIMIT_AS", RLIMIT_AS);
 287 #endif
 288
 289 #ifdef RLIMIT_RSS
 290         PyModule_AddIntConstant(m, "RLIMIT_RSS", RLIMIT_RSS);
 291 #endif
 292
 293 #ifdef RLIMIT_NPROC
 294         PyModule_AddIntConstant(m, "RLIMIT_NPROC", RLIMIT_NPROC);
 295 #endif
 296
 297 #ifdef RLIMIT_MEMLOCK
 298         PyModule_AddIntConstant(m, "RLIMIT_MEMLOCK", RLIMIT_MEMLOCK);
 299 #endif
 300
 301 #ifdef RLIMIT_SBSIZE
 302         PyModule_AddIntConstant(m, "RLIMIT_SBSIZE", RLIMIT_SBSIZE);
 303 #endif
 304
 305 #ifdef RUSAGE_SELF
 306         PyModule_AddIntConstant(m, "RUSAGE_SELF", RUSAGE_SELF);
 307 #endif
 308
 309 #ifdef RUSAGE_CHILDREN
 310         PyModule_AddIntConstant(m, "RUSAGE_CHILDREN", RUSAGE_CHILDREN);
 311 #endif
 312
 313 #ifdef RUSAGE_BOTH
 314         PyModule_AddIntConstant(m, "RUSAGE_BOTH", RUSAGE_BOTH);
 315 #endif
 316
 317 #if defined(HAVE_LONG_LONG)
 318         if (sizeof(RLIM_INFINITY) > sizeof(long)) {
 319                 v = PyLong_FromLongLong((PY_LONG_LONG) RLIM_INFINITY);
 320         } else
 321 #endif
 322         {
 323                 v = PyInt_FromLong((long) RLIM_INFINITY);
 324         }
 325         if (v) {
 326                 PyModule_AddObject(m, "RLIM_INFINITY", v);
 327         }
 328         initialized = 1;
 329 }