CODEWITHSUNDEEP
pythonpython-3.x
luizbarcelos
luizbarcelos

Reputation: 696

Where Python's execv implementation is located?

I'm trying to find where in CPython's implementation execv is implemented. I've found this commit from Guido where he adds it back in 1993, but the commit does not show where execv comes from.

Upvotes: 0

Views: 51

Answers (1)

C.Nivs
C.Nivs

Reputation: 13106

From help(os.execv):

Help on built-in function execv in module posix:

execv(path, argv, /) Execute an executable path with arguments, replacing current process.

path
  Path of executable file.
argv
  Tuple or list of strings.

It's defined in posix, which is a c module to wrap unix functions. The snippet you are probably looking for is here:

#ifdef HAVE_EXECV
/*[clinic input]
os.execv
    path: path_t
        Path of executable file.
    argv: object
        Tuple or list of strings.
    /
Execute an executable path with arguments, replacing current process.
[clinic start generated code]*/

static PyObject *
os_execv_impl(PyObject *module, path_t *path, PyObject *argv)
/*[clinic end generated code: output=3b52fec34cd0dafd input=9bac31efae07dac7]*/
{
    EXECV_CHAR **argvlist;
    Py_ssize_t argc;

    /* execv has two arguments: (path, argv), where
       argv is a list or tuple of strings. */

    if (!PyList_Check(argv) && !PyTuple_Check(argv)) {
        PyErr_SetString(PyExc_TypeError,
                        "execv() arg 2 must be a tuple or list");
        return NULL;
    }
    argc = PySequence_Size(argv);
    if (argc < 1) {
        PyErr_SetString(PyExc_ValueError, "execv() arg 2 must not be empty");
        return NULL;
    }

    argvlist = parse_arglist(argv, &argc);
    if (argvlist == NULL) {
        return NULL;
    }
    if (!argvlist[0][0]) {
        PyErr_SetString(PyExc_ValueError,
            "execv() arg 2 first element cannot be empty");
        free_string_array(argvlist, argc);
        return NULL;
    }

    if (PySys_Audit("os.exec", "OOO", path->object, argv, Py_None) < 0) {
        free_string_array(argvlist, argc);
        return NULL;
    }

    _Py_BEGIN_SUPPRESS_IPH
#ifdef HAVE_WEXECV
    _wexecv(path->wide, argvlist);
#else
    execv(path->narrow, argvlist);
#endif
    _Py_END_SUPPRESS_IPH

    /* If we get here it's definitely an error */

    free_string_array(argvlist, argc);
    return posix_error();
}

Upvotes: 1

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