ref: 52cacba37c6f3a125ef931afa4b9c2cdb7438fef
dir: /sys/src/cmd/python/Modules/resource.c/
#include "Python.h"
#include "structseq.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)
static PyObject *ResourceError;
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(ResourceError);
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, PyInt_FromLong(ru.ru_maxrss));
PyStructSequence_SET_ITEM(result, 3, PyInt_FromLong(ru.ru_ixrss));
PyStructSequence_SET_ITEM(result, 4, PyInt_FromLong(ru.ru_idrss));
PyStructSequence_SET_ITEM(result, 5, PyInt_FromLong(ru.ru_isrss));
PyStructSequence_SET_ITEM(result, 6, PyInt_FromLong(ru.ru_minflt));
PyStructSequence_SET_ITEM(result, 7, PyInt_FromLong(ru.ru_majflt));
PyStructSequence_SET_ITEM(result, 8, PyInt_FromLong(ru.ru_nswap));
PyStructSequence_SET_ITEM(result, 9, PyInt_FromLong(ru.ru_inblock));
PyStructSequence_SET_ITEM(result, 10, PyInt_FromLong(ru.ru_oublock));
PyStructSequence_SET_ITEM(result, 11, PyInt_FromLong(ru.ru_msgsnd));
PyStructSequence_SET_ITEM(result, 12, PyInt_FromLong(ru.ru_msgrcv));
PyStructSequence_SET_ITEM(result, 13, PyInt_FromLong(ru.ru_nsignals));
PyStructSequence_SET_ITEM(result, 14, PyInt_FromLong(ru.ru_nvcsw));
PyStructSequence_SET_ITEM(result, 15, PyInt_FromLong(ru.ru_nivcsw));
if (PyErr_Occurred()) {
Py_DECREF(result);
return NULL;
}
return result;
}
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(ResourceError);
return NULL;
}
#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_setrlimit(PyObject *self, PyObject *args)
{
struct rlimit rl;
int resource;
PyObject *curobj, *maxobj;
if (!PyArg_ParseTuple(args, "i(OO):setrlimit",
&resource, &curobj, &maxobj))
return NULL;
if (resource < 0 || resource >= RLIM_NLIMITS) {
PyErr_SetString(PyExc_ValueError,
"invalid resource specified");
return NULL;
}
#if !defined(HAVE_LARGEFILE_SUPPORT)
rl.rlim_cur = PyInt_AsLong(curobj);
if (rl.rlim_cur == -1 && PyErr_Occurred())
return NULL;
rl.rlim_max = PyInt_AsLong(maxobj);
if (rl.rlim_max == -1 && PyErr_Occurred())
return NULL;
#else
/* The limits are probably bigger than a long */
rl.rlim_cur = PyLong_Check(curobj) ?
PyLong_AsLongLong(curobj) : PyInt_AsLong(curobj);
if (rl.rlim_cur == -1 && PyErr_Occurred())
return NULL;
rl.rlim_max = PyLong_Check(maxobj) ?
PyLong_AsLongLong(maxobj) : PyInt_AsLong(maxobj);
if (rl.rlim_max == -1 && PyErr_Occurred())
return NULL;
#endif
rl.rlim_cur = rl.rlim_cur & RLIM_INFINITY;
rl.rlim_max = rl.rlim_max & RLIM_INFINITY;
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(ResourceError);
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
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},
{"setrlimit", resource_setrlimit, METH_VARARGS},
{"getpagesize", resource_getpagesize, METH_NOARGS},
{NULL, NULL} /* sentinel */
};
/* Module initialization */
PyMODINIT_FUNC
initresource(void)
{
PyObject *m, *v;
/* Create the module and add the functions */
m = Py_InitModule("resource", resource_methods);
if (m == NULL)
return;
/* Add some symbolic constants to the module */
if (ResourceError == NULL) {
ResourceError = PyErr_NewException("resource.error",
NULL, NULL);
}
Py_INCREF(ResourceError);
PyModule_AddObject(m, "error", ResourceError);
if (!initialized)
PyStructSequence_InitType(&StructRUsageType,
&struct_rusage_desc);
Py_INCREF(&StructRUsageType);
PyModule_AddObject(m, "struct_rusage",
(PyObject*) &StructRUsageType);
/* insert constants */
#ifdef RLIMIT_CPU
PyModule_AddIntConstant(m, "RLIMIT_CPU", RLIMIT_CPU);
#endif
#ifdef RLIMIT_FSIZE
PyModule_AddIntConstant(m, "RLIMIT_FSIZE", RLIMIT_FSIZE);
#endif
#ifdef RLIMIT_DATA
PyModule_AddIntConstant(m, "RLIMIT_DATA", RLIMIT_DATA);
#endif
#ifdef RLIMIT_STACK
PyModule_AddIntConstant(m, "RLIMIT_STACK", RLIMIT_STACK);
#endif
#ifdef RLIMIT_CORE
PyModule_AddIntConstant(m, "RLIMIT_CORE", RLIMIT_CORE);
#endif
#ifdef RLIMIT_NOFILE
PyModule_AddIntConstant(m, "RLIMIT_NOFILE", RLIMIT_NOFILE);
#endif
#ifdef RLIMIT_OFILE
PyModule_AddIntConstant(m, "RLIMIT_OFILE", RLIMIT_OFILE);
#endif
#ifdef RLIMIT_VMEM
PyModule_AddIntConstant(m, "RLIMIT_VMEM", RLIMIT_VMEM);
#endif
#ifdef RLIMIT_AS
PyModule_AddIntConstant(m, "RLIMIT_AS", RLIMIT_AS);
#endif
#ifdef RLIMIT_RSS
PyModule_AddIntConstant(m, "RLIMIT_RSS", RLIMIT_RSS);
#endif
#ifdef RLIMIT_NPROC
PyModule_AddIntConstant(m, "RLIMIT_NPROC", RLIMIT_NPROC);
#endif
#ifdef RLIMIT_MEMLOCK
PyModule_AddIntConstant(m, "RLIMIT_MEMLOCK", RLIMIT_MEMLOCK);
#endif
#ifdef RUSAGE_SELF
PyModule_AddIntConstant(m, "RUSAGE_SELF", RUSAGE_SELF);
#endif
#ifdef RUSAGE_CHILDREN
PyModule_AddIntConstant(m, "RUSAGE_CHILDREN", RUSAGE_CHILDREN);
#endif
#ifdef RUSAGE_BOTH
PyModule_AddIntConstant(m, "RUSAGE_BOTH", RUSAGE_BOTH);
#endif
#if defined(HAVE_LONG_LONG)
if (sizeof(RLIM_INFINITY) > sizeof(long)) {
v = PyLong_FromLongLong((PY_LONG_LONG) RLIM_INFINITY);
} else
#endif
{
v = PyInt_FromLong((long) RLIM_INFINITY);
}
if (v) {
PyModule_AddObject(m, "RLIM_INFINITY", v);
}
initialized = 1;
}