add C extension module for system calls Python doesn't provide

Snarfed from Obnam.

1 files changed, 166 insertions, 0 deletions

diff --git a/_summainmodule.c b/_summainmodule.c
new file mode 100644
index 0000000..4184ef0
--- /dev/null
+++ b/_summainmodule.c
@@ -0,0 +1,166 @@
+/*
+ * _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 <attr/xattr.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+
+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("iLLLLLLLLLLLLLLLL", 
+                         ret,
+                         (long long) st.st_dev,
+                         (long long) st.st_ino,
+                         (long long) st.st_mode,
+                         (long long) st.st_nlink,
+                         (long long) st.st_uid,
+                         (long long) st.st_gid,
+                         (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,
+                         (long long) st.st_atim.tv_nsec,
+                         (long long) st.st_mtim.tv_sec,
+                         (long long) st.st_mtim.tv_nsec,
+                         (long long) st.st_ctim.tv_sec,
+                         (long long) st.st_ctim.tv_nsec);
+}
+
+
+static PyObject *
+llistxattr_wrapper(PyObject *self, PyObject *args)
+{
+    const char *filename;
+    size_t bufsize;
+    PyObject *o;
+
+    if (!PyArg_ParseTuple(args, "s", &filename))
+        return NULL;
+
+    bufsize = 0;
+    o = NULL;
+    do {
+        bufsize += 1024;
+        char *buf = malloc(bufsize);
+        ssize_t 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);
+    
+    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);
+        ssize_t n = lgetxattr(filename, attrname, 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);
+    
+    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;
+
+    ret = lsetxattr(filename, name, value, size, 0);
+    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);
+}