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Issue #16595: Add prlimit() to resource module

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prlimit() is a Linux specific command that combines setrlimit, getrlimit and can set the limit
of other processes.
This commit is contained in:
Christian Heimes 2013-10-22 11:21:54 +02:00
parent 6fc79bf813
commit b7bd5df809
8 changed files with 169 additions and 26 deletions
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112
Modules/resource.c
View file

@ -106,6 +106,44 @@ resource_getrusage(PyObject *self, PyObject *args)
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 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)
@ -126,15 +164,7 @@ resource_getrlimit(PyObject *self, PyObject *args)
PyErr_SetFromErrno(PyExc_OSError);
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);
return rlimit2py(rl);
}
static PyObject *
@ -166,25 +196,10 @@ resource_setrlimit(PyObject *self, PyObject *args)
curobj = PyTuple_GET_ITEM(limits, 0);
maxobj = PyTuple_GET_ITEM(limits, 1);
#if !defined(HAVE_LARGEFILE_SUPPORT)
rl.rlim_cur = PyLong_AsLong(curobj);
if (rl.rlim_cur == (rlim_t)-1 && PyErr_Occurred())
if (py2rlimit(curobj, maxobj, &rl) < 0) {
goto error;
rl.rlim_max = PyLong_AsLong(maxobj);
if (rl.rlim_max == (rlim_t)-1 && PyErr_Occurred())
goto error;
#else
/* The limits are probably bigger than a long */
rl.rlim_cur = PyLong_AsLongLong(curobj);
if (rl.rlim_cur == (rlim_t)-1 && PyErr_Occurred())
goto error;
rl.rlim_max = PyLong_AsLongLong(maxobj);
if (rl.rlim_max == (rlim_t)-1 && PyErr_Occurred())
goto error;
#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,
@ -205,6 +220,48 @@ resource_setrlimit(PyObject *self, PyObject *args)
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)
{
@ -229,6 +286,9 @@ 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 */