cpython/Modules/resource.c at 3.5 · python/cpython · GitHub

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#include "Python.h"

#include <sys/resource.h>

#include <sys/time.h>

#include <string.h>

#include <errno.h>

/* for sysconf */

#if defined(HAVE_UNISTD_H)

#include <unistd.h>

#endif

/* On some systems, these aren't in any header file.

On others they are, with inconsistent prototypes.

We declare the (default) return type, to shut up gcc -Wall;

but we can't declare the prototype, to avoid errors

when the header files declare it different.

Worse, on some Linuxes, getpagesize() returns a size_t... */

#define doubletime(TV) ((double)(TV).tv_sec + (TV).tv_usec * 0.000001)

PyDoc_STRVAR(struct_rusage__doc__,

"struct_rusage: Result from getrusage.\n\n"

"This object may be accessed either as a tuple of\n"

" (utime,stime,maxrss,ixrss,idrss,isrss,minflt,majflt,\n"

" nswap,inblock,oublock,msgsnd,msgrcv,nsignals,nvcsw,nivcsw)\n"

"or via the attributes ru_utime, ru_stime, ru_maxrss, and so on.");

static PyStructSequence_Field struct_rusage_fields[] = {

{"ru_utime", "user time used"},

{"ru_stime", "system time used"},

{"ru_maxrss", "max. resident set size"},

{"ru_ixrss", "shared memory size"},

{"ru_idrss", "unshared data size"},

{"ru_isrss", "unshared stack size"},

{"ru_minflt", "page faults not requiring I/O"},

{"ru_majflt", "page faults requiring I/O"},

{"ru_nswap", "number of swap outs"},

{"ru_inblock", "block input operations"},

{"ru_oublock", "block output operations"},

{"ru_msgsnd", "IPC messages sent"},

{"ru_msgrcv", "IPC messages received"},

{"ru_nsignals", "signals received"},

{"ru_nvcsw", "voluntary context switches"},

{"ru_nivcsw", "involuntary context switches"},

{0}

};

static PyStructSequence_Desc struct_rusage_desc = {

"resource.struct_rusage", /* name */

struct_rusage__doc__, /* doc */

struct_rusage_fields, /* fields */

16 /* n_in_sequence */

};

static int initialized;

static PyTypeObject StructRUsageType;

static PyObject *

resource_getrusage(PyObject *self, PyObject *args)

{

int who;

struct rusage ru;

PyObject *result;

if (!PyArg_ParseTuple(args, "i:getrusage", &who))

return NULL;

if (getrusage(who, &ru) == -1) {

if (errno == EINVAL) {

PyErr_SetString(PyExc_ValueError,

"invalid who parameter");

return NULL;

}

PyErr_SetFromErrno(PyExc_OSError);

return NULL;

}

result = PyStructSequence_New(&StructRUsageType);

if (!result)

return NULL;

PyStructSequence_SET_ITEM(result, 0,

PyFloat_FromDouble(doubletime(ru.ru_utime)));

PyStructSequence_SET_ITEM(result, 1,

PyFloat_FromDouble(doubletime(ru.ru_stime)));

PyStructSequence_SET_ITEM(result, 2, PyLong_FromLong(ru.ru_maxrss));

PyStructSequence_SET_ITEM(result, 3, PyLong_FromLong(ru.ru_ixrss));

PyStructSequence_SET_ITEM(result, 4, PyLong_FromLong(ru.ru_idrss));

PyStructSequence_SET_ITEM(result, 5, PyLong_FromLong(ru.ru_isrss));

PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(ru.ru_minflt));

PyStructSequence_SET_ITEM(result, 7, PyLong_FromLong(ru.ru_majflt));

PyStructSequence_SET_ITEM(result, 8, PyLong_FromLong(ru.ru_nswap));

PyStructSequence_SET_ITEM(result, 9, PyLong_FromLong(ru.ru_inblock));

PyStructSequence_SET_ITEM(result, 10, PyLong_FromLong(ru.ru_oublock));

PyStructSequence_SET_ITEM(result, 11, PyLong_FromLong(ru.ru_msgsnd));

PyStructSequence_SET_ITEM(result, 12, PyLong_FromLong(ru.ru_msgrcv));

PyStructSequence_SET_ITEM(result, 13, PyLong_FromLong(ru.ru_nsignals));

PyStructSequence_SET_ITEM(result, 14, PyLong_FromLong(ru.ru_nvcsw));

PyStructSequence_SET_ITEM(result, 15, PyLong_FromLong(ru.ru_nivcsw));

if (PyErr_Occurred()) {

Py_DECREF(result);

return NULL;

}

return result;

}

static int

py2rlimit(PyObject *limits, struct rlimit *rl_out)

{

PyObject *curobj, *maxobj;

limits = PySequence_Tuple(limits);

if (!limits)

/* Here limits is a borrowed reference */

return -1;

if (PyTuple_GET_SIZE(limits) != 2) {

PyErr_SetString(PyExc_ValueError,

"expected a tuple of 2 integers");

goto error;

}

curobj = PyTuple_GET_ITEM(limits, 0);

maxobj = PyTuple_GET_ITEM(limits, 1);

#if !defined(HAVE_LARGEFILE_SUPPORT)

rl_out->rlim_cur = PyLong_AsLong(curobj);

if (rl_out->rlim_cur == (rlim_t)-1 && PyErr_Occurred())

goto error;

rl_out->rlim_max = PyLong_AsLong(maxobj);

if (rl_out->rlim_max == (rlim_t)-1 && PyErr_Occurred())

goto error;

#else

/* The limits are probably bigger than a long */

rl_out->rlim_cur = PyLong_AsLongLong(curobj);

if (rl_out->rlim_cur == (rlim_t)-1 && PyErr_Occurred())

goto error;

rl_out->rlim_max = PyLong_AsLongLong(maxobj);

if (rl_out->rlim_max == (rlim_t)-1 && PyErr_Occurred())

goto error;

#endif

Py_DECREF(limits);

rl_out->rlim_cur = rl_out->rlim_cur & RLIM_INFINITY;

rl_out->rlim_max = rl_out->rlim_max & RLIM_INFINITY;

return 0;

error:

Py_DECREF(limits);

return -1;

}

static PyObject*

rlimit2py(struct rlimit rl)

{

#if defined(HAVE_LONG_LONG)

if (sizeof(rl.rlim_cur) > sizeof(long)) {

return Py_BuildValue("LL",

(PY_LONG_LONG) rl.rlim_cur,

(PY_LONG_LONG) rl.rlim_max);

}

#endif

return Py_BuildValue("ll", (long) rl.rlim_cur, (long) rl.rlim_max);

}

static PyObject *

resource_getrlimit(PyObject *self, PyObject *args)

{

struct rlimit rl;

int resource;

if (!PyArg_ParseTuple(args, "i:getrlimit", &resource))

return NULL;

if (resource < 0 || resource >= RLIM_NLIMITS) {

PyErr_SetString(PyExc_ValueError,

"invalid resource specified");

return NULL;

}

if (getrlimit(resource, &rl) == -1) {

PyErr_SetFromErrno(PyExc_OSError);

return NULL;

}

return rlimit2py(rl);

}

static PyObject *

resource_setrlimit(PyObject *self, PyObject *args)

{

struct rlimit rl;

int resource;

PyObject *limits;

if (!PyArg_ParseTuple(args, "iO:setrlimit", &resource, &limits))

return NULL;

if (resource < 0 || resource >= RLIM_NLIMITS) {

PyErr_SetString(PyExc_ValueError,

"invalid resource specified");

return NULL;

}

if (py2rlimit(limits, &rl) < 0) {

return NULL;

}

if (setrlimit(resource, &rl) == -1) {

if (errno == EINVAL)

PyErr_SetString(PyExc_ValueError,

"current limit exceeds maximum limit");

else if (errno == EPERM)

PyErr_SetString(PyExc_ValueError,

"not allowed to raise maximum limit");

else

PyErr_SetFromErrno(PyExc_OSError);

return NULL;

}

Py_RETURN_NONE;

}

#ifdef HAVE_PRLIMIT

static PyObject *

resource_prlimit(PyObject *self, PyObject *args)

{

struct rlimit old_limit, new_limit;

int resource, retval;

pid_t pid;

PyObject *limits = NULL;

if (!PyArg_ParseTuple(args, _Py_PARSE_PID "i|O:prlimit",

&pid, &resource, &limits))

return NULL;

if (resource < 0 || resource >= RLIM_NLIMITS) {

PyErr_SetString(PyExc_ValueError,

"invalid resource specified");

return NULL;

}

if (limits != NULL) {

if (py2rlimit(limits, &new_limit) < 0) {

return NULL;

}

retval = prlimit(pid, resource, &new_limit, &old_limit);

}

else {

retval = prlimit(pid, resource, NULL, &old_limit);

}

if (retval == -1) {

if (errno == EINVAL) {

PyErr_SetString(PyExc_ValueError,

"current limit exceeds maximum limit");

} else {

PyErr_SetFromErrno(PyExc_OSError);

}

return NULL;

}

return rlimit2py(old_limit);

}

#endif /* HAVE_PRLIMIT */

static PyObject *

resource_getpagesize(PyObject *self, PyObject *unused)

{

long pagesize = 0;

#if defined(HAVE_GETPAGESIZE)

pagesize = getpagesize();

#elif defined(HAVE_SYSCONF)

#if defined(_SC_PAGE_SIZE)

pagesize = sysconf(_SC_PAGE_SIZE);

#else

/* Irix 5.3 has _SC_PAGESIZE, but not _SC_PAGE_SIZE */

pagesize = sysconf(_SC_PAGESIZE);

#endif

return Py_BuildValue("i", pagesize);

}

/* List of functions */

static struct PyMethodDef

resource_methods[] = {

{"getrusage", resource_getrusage, METH_VARARGS},

{"getrlimit", resource_getrlimit, METH_VARARGS},

#ifdef HAVE_PRLIMIT

{"prlimit", resource_prlimit, METH_VARARGS},

#endif

{"setrlimit", resource_setrlimit, METH_VARARGS},

{"getpagesize", resource_getpagesize, METH_NOARGS},

{NULL, NULL} /* sentinel */

};

/* Module initialization */

static struct PyModuleDef resourcemodule = {

PyModuleDef_HEAD_INIT,

"resource",

NULL,

-1,

resource_methods,

NULL,

NULL

};

PyMODINIT_FUNC

PyInit_resource(void)

{

PyObject *m, *v;

/* Create the module and add the functions */

m = PyModule_Create(&resourcemodule);

if (m == NULL)

return NULL;

/* Add some symbolic constants to the module */

Py_INCREF(PyExc_OSError);

PyModule_AddObject(m, "error", PyExc_OSError);

if (!initialized) {

if (PyStructSequence_InitType2(&StructRUsageType,

&struct_rusage_desc) < 0)

return NULL;

}

Py_INCREF(&StructRUsageType);

PyModule_AddObject(m, "struct_rusage",

(PyObject*) &StructRUsageType);

/* insert constants */

#ifdef RLIMIT_CPU

PyModule_AddIntMacro(m, RLIMIT_CPU);

#endif

#ifdef RLIMIT_FSIZE

PyModule_AddIntMacro(m, RLIMIT_FSIZE);

#endif

#ifdef RLIMIT_DATA

PyModule_AddIntMacro(m, RLIMIT_DATA);

#endif

#ifdef RLIMIT_STACK

PyModule_AddIntMacro(m, RLIMIT_STACK);

#endif

#ifdef RLIMIT_CORE

PyModule_AddIntMacro(m, RLIMIT_CORE);

#endif

#ifdef RLIMIT_NOFILE

PyModule_AddIntMacro(m, RLIMIT_NOFILE);

#endif

#ifdef RLIMIT_OFILE

PyModule_AddIntMacro(m, RLIMIT_OFILE);

#endif

#ifdef RLIMIT_VMEM

PyModule_AddIntMacro(m, RLIMIT_VMEM);

#endif

#ifdef RLIMIT_AS

PyModule_AddIntMacro(m, RLIMIT_AS);

#endif

#ifdef RLIMIT_RSS

PyModule_AddIntMacro(m, RLIMIT_RSS);

#endif

#ifdef RLIMIT_NPROC

PyModule_AddIntMacro(m, RLIMIT_NPROC);

#endif

#ifdef RLIMIT_MEMLOCK

PyModule_AddIntMacro(m, RLIMIT_MEMLOCK);

#endif

#ifdef RLIMIT_SBSIZE

PyModule_AddIntMacro(m, RLIMIT_SBSIZE);

#endif

/* Linux specific */

#ifdef RLIMIT_MSGQUEUE

PyModule_AddIntMacro(m, RLIMIT_MSGQUEUE);

#endif

#ifdef RLIMIT_NICE

PyModule_AddIntMacro(m, RLIMIT_NICE);

#endif

#ifdef RLIMIT_RTPRIO

PyModule_AddIntMacro(m, RLIMIT_RTPRIO);

#endif

#ifdef RLIMIT_RTTIME

PyModule_AddIntMacro(m, RLIMIT_RTTIME);

#endif

#ifdef RLIMIT_SIGPENDING

PyModule_AddIntMacro(m, RLIMIT_SIGPENDING);

#endif

/* target */

#ifdef RUSAGE_SELF

PyModule_AddIntMacro(m, RUSAGE_SELF);

#endif

#ifdef RUSAGE_CHILDREN

PyModule_AddIntMacro(m, RUSAGE_CHILDREN);

#endif

#ifdef RUSAGE_BOTH

PyModule_AddIntMacro(m, RUSAGE_BOTH);

#endif

#ifdef RUSAGE_THREAD

PyModule_AddIntMacro(m, RUSAGE_THREAD);

#endif

/* FreeBSD specific */

#ifdef RLIMIT_SWAP

PyModule_AddIntMacro(m, RLIMIT_SWAP);

#endif

#ifdef RLIMIT_SBSIZE

PyModule_AddIntMacro(m, RLIMIT_SBSIZE);

#endif

#ifdef RLIMIT_NPTS

PyModule_AddIntMacro(m, RLIMIT_NPTS);

#endif

#if defined(HAVE_LONG_LONG)

if (sizeof(RLIM_INFINITY) > sizeof(long)) {

v = PyLong_FromLongLong((PY_LONG_LONG) RLIM_INFINITY);

} else

#endif

{

v = PyLong_FromLong((long) RLIM_INFINITY);

}

if (v) {

PyModule_AddObject(m, "RLIM_INFINITY", v);

}

initialized = 1;

return m;

}

cpython/Modules/resource.c at 3.5 · python/cpython · GitHub

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