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cpython/Modules/resource.c

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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 *curobj, PyObject *maxobj, struct rlimit *rl_out)
{
#if !defined(HAVE_LARGEFILE_SUPPORT)
rl_out->rlim_cur = PyLong_AsLong(curobj);
if (rl_out->rlim_cur == (rlim_t)-1 && PyErr_Occurred())
return -1;
rl_out->rlim_max = PyLong_AsLong(maxobj);
if (rl_out->rlim_max == (rlim_t)-1 && PyErr_Occurred())
return -1;
#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())
return -1;
rl_out->rlim_max = PyLong_AsLongLong(maxobj);
if (rl_out->rlim_max == (rlim_t)-1 && PyErr_Occurred())
return -1;
#endif
rl_out->rlim_cur = rl_out->rlim_cur & RLIM_INFINITY;
rl_out->rlim_max = rl_out->rlim_max & RLIM_INFINITY;
return 0;
}
static PyObject*
rlimit2py(struct rlimit rl)
{
if (sizeof(rl.rlim_cur) > sizeof(long)) {
return Py_BuildValue("LL",
(long long) rl.rlim_cur,
(long long) rl.rlim_max);
}
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, *curobj, *maxobj;
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;
}
limits = PySequence_Tuple(limits);
if (!limits)
/* Here limits is a borrowed reference */
return NULL;
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 (py2rlimit(curobj, maxobj, &rl) < 0) {
goto error;
}
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);
goto error;
}
Py_DECREF(limits);
Py_INCREF(Py_None);
return Py_None;
error:
Py_DECREF(limits);
return NULL;
}
#ifdef HAVE_PRLIMIT
static PyObject *
resource_prlimit(PyObject *self, PyObject *args)
{
struct rlimit old_limit, new_limit;
int resource, retval;
pid_t pid;
PyObject *curobj=NULL, *maxobj=NULL;
if (!PyArg_ParseTuple(args, _Py_PARSE_PID "i|(OO):prlimit",
&pid, &resource, &curobj, &maxobj))
return NULL;
if (resource < 0 || resource >= RLIM_NLIMITS) {
PyErr_SetString(PyExc_ValueError,
"invalid resource specified");
return NULL;
}
if (curobj != NULL) {
if (py2rlimit(curobj, maxobj, &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
#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,
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 (sizeof(RLIM_INFINITY) > sizeof(long)) {
v = PyLong_FromLongLong((long long) RLIM_INFINITY);
} else
{
v = PyLong_FromLong((long) RLIM_INFINITY);
}
if (v) {
PyModule_AddObject(m, "RLIM_INFINITY", v);
}
initialized = 1;
return m;
}
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