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/*
* _summainmodule.c -- Python extensions for Summain
*
* Copyright (C) 2008, 2009 Lars Wirzenius <liw@liw.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <Python.h>
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#endif
#define _POSIX_C_SOURCE 200809L
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#ifdef __FreeBSD__
#define NO_NANOSECONDS 1
#include <sys/extattr.h>
#else
#define NO_NANOSECONDS 0
#include <sys/xattr.h>
#endif
/*
* Since we can't set nanosecond mtime and atimes on some platforms, also
* don't retrieve that level of precision from lstat(), so comparisons
* work.
*/
static unsigned long long
remove_precision(unsigned long long nanoseconds)
{
#if NO_NANOSECONDS
return nanoseconds - (nanoseconds % 1000);
#else
return nanoseconds;
#endif
}
static PyObject *
lstat_wrapper(PyObject *self, PyObject *args)
{
int ret;
const char *filename;
struct stat st = {0};
if (!PyArg_ParseTuple(args, "s", &filename))
return NULL;
ret = lstat(filename, &st);
if (ret == -1)
ret = errno;
return Py_BuildValue("iKKKKKKKLLLLKLKLK",
ret,
(unsigned long long) st.st_dev,
(unsigned long long) st.st_ino,
(unsigned long long) st.st_mode,
(unsigned long long) st.st_nlink,
(unsigned long long) st.st_uid,
(unsigned long long) st.st_gid,
(unsigned long long) st.st_rdev,
(long long) st.st_size,
(long long) st.st_blksize,
(long long) st.st_blocks,
(long long) st.st_atim.tv_sec,
remove_precision(st.st_atim.tv_nsec),
(long long) st.st_mtim.tv_sec,
remove_precision(st.st_mtim.tv_nsec),
(long long) st.st_ctim.tv_sec,
remove_precision(st.st_ctim.tv_nsec));
}
static PyObject *
llistxattr_wrapper(PyObject *self, PyObject *args)
{
const char *filename;
size_t bufsize;
PyObject *o;
char* buf;
ssize_t n;
if (!PyArg_ParseTuple(args, "s", &filename))
return NULL;
#ifdef __FreeBSD__
bufsize = extattr_list_link(filename, EXTATTR_NAMESPACE_USER, NULL, 0);
buf = malloc(bufsize);
n = extattr_list_link(filename, EXTATTR_NAMESPACE_USER, buf, bufsize);
if (n >= 0) {
/* Convert from length-prefixed BSD style to '\0'-suffixed
Linux style. */
size_t i = 0;
while (i < n) {
unsigned char length = (unsigned char) buf[i];
memmove(buf + i, buf + i + 1, length);
buf[i + length] = '\0';
i += length + 1;
}
o = Py_BuildValue("s#", buf, (int) n);
} else {
o = Py_BuildValue("i", errno);
}
free(buf);
#else
bufsize = 0;
o = NULL;
do {
bufsize += 1024;
buf = malloc(bufsize);
n = llistxattr(filename, buf, bufsize);
if (n >= 0)
o = Py_BuildValue("s#", buf, (int) n);
else if (n == -1 && errno != ERANGE)
o = Py_BuildValue("i", errno);
free(buf);
} while (o == NULL);
#endif
return o;
}
static PyObject *
lgetxattr_wrapper(PyObject *self, PyObject *args)
{
const char *filename;
const char *attrname;
size_t bufsize;
PyObject *o;
if (!PyArg_ParseTuple(args, "ss", &filename, &attrname))
return NULL;
bufsize = 0;
o = NULL;
do {
bufsize += 1024;
char *buf = malloc(bufsize);
#ifdef __FreeBSD__
int n = extattr_get_link(filename, EXTATTR_NAMESPACE_USER, attrname, buf, bufsize);
#else
ssize_t n = lgetxattr(filename, attrname, buf, bufsize);
#endif
if (n >= 0)
o = Py_BuildValue("s#", buf, (int) n);
else if (n == -1 && errno != ERANGE)
o = Py_BuildValue("i", errno);
free(buf);
} while (o == NULL);
return o;
}
static PyObject *
lsetxattr_wrapper(PyObject *self, PyObject *args)
{
const char *filename;
const char *name;
const char *value;
int size;
int ret;
if (!PyArg_ParseTuple(args, "sss#", &filename, &name, &value, &size))
return NULL;
#ifdef __FreeBSD__
ret = extattr_set_link(filename, EXTATTR_NAMESPACE_USER, name, value, size);
#else
ret = lsetxattr(filename, name, value, size, 0);
#endif
if (ret == -1)
ret = errno;
return Py_BuildValue("i", ret);
}
static PyMethodDef methods[] = {
{"lstat", lstat_wrapper, METH_VARARGS,
"lstat(2) wrapper; arg is filename, returns tuple."},
{"llistxattr", llistxattr_wrapper, METH_VARARGS,
"llistxattr(2) wrapper; arg is filename, returns tuple."},
{"lgetxattr", lgetxattr_wrapper, METH_VARARGS,
"lgetxattr(2) wrapper; arg is filename, returns tuple."},
{"lsetxattr", lsetxattr_wrapper, METH_VARARGS,
"lsetxattr(2) wrapper; arg is filename, returns errno."},
{NULL, NULL, 0, NULL} /* Sentinel */
};
PyMODINIT_FUNC
init_summain(void)
{
(void) Py_InitModule("_summain", methods);
}
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