summaryrefslogtreecommitdiffstats
path: root/Modules/resource.c
blob: fe6f3b6a25fa5fcf7c9a73dec5c4a5891df6c396 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325

#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;
}