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#include <Python.h>
#include <stdbool.h>
#if __APPLE__
#include <sys/types.h>
#endif
#include <sys/ptrace.h>
#define UNUSED(arg) arg __attribute__((unused))
char python_ptrace_DOCSTR[] =
"ptrace(command: int, pid: int, arg1=0, arg2=0, check_errno=False): call ptrace syscall.\r\n"
"Raise a ValueError on error.\r\n"
"Returns an unsigned integer.\r\n";
static bool cpython_cptrace(
unsigned int request,
pid_t pid,
void *arg1,
void *arg2,
bool check_errno,
unsigned long *result)
{
unsigned long ret;
errno = 0;
ret = ptrace(request, pid, arg1, arg2);
if ((long)ret == -1) {
/**
* peek operations may returns -1 with errno=0: it's not an error.
* For other operations, -1 is always an error
*/
if (!check_errno || errno) {
PyErr_Format(
PyExc_ValueError,
"ptrace(request=%u, pid=%i, %p, %p) "
"error #%i: %s",
request, pid, arg1, arg2,
errno, strerror(errno));
return false;
}
}
if (result)
*result = ret;
return true;
}
static PyObject* cpython_ptrace(PyObject* UNUSED(self), PyObject *args, PyObject *keywds)
{
unsigned long result;
unsigned int request;
pid_t pid;
unsigned long arg1 = 0;
unsigned long arg2 = 0;
bool check_errno = false;
PyObject* check_errno_p = NULL;
static char *kwlist[] = {"request", "pid", "arg1", "arg2", "check_errno", NULL};
if (!PyArg_ParseTupleAndKeywords(args, keywds,
"Ii|LLO", kwlist,
&request, &pid, &arg1, &arg2, &check_errno_p
))
{
return NULL;
}
if (check_errno_p) {
check_errno = PyObject_IsTrue(check_errno_p);
}
if (cpython_cptrace(request, pid, (void*)arg1, (void*)arg2, check_errno, &result))
return PyLong_FromUnsignedLong(result);
else
return NULL;
}
static PyMethodDef module_methods[] = {
{"ptrace", (PyCFunction)cpython_ptrace, METH_VARARGS | METH_KEYWORDS, python_ptrace_DOCSTR},
{NULL, NULL, 0, NULL}
};
PyDoc_STRVAR(module_doc,
"ptrace module written in C");
#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef module_def = {
PyModuleDef_HEAD_INIT,
"cptrace",
module_doc,
0,
module_methods,
NULL
};
#endif
PyMODINIT_FUNC
#if PY_MAJOR_VERSION >= 3
PyInit_cptrace(void)
#else
initcptrace(void)
#endif
{
#if PY_MAJOR_VERSION >= 3
return PyModule_Create(&module_def);
#else
(void)Py_InitModule3("cptrace", module_methods, module_doc);
#endif
}
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