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/* Bindings for visitor function.
* Copyright (C) 2016 Red Hat Inc.
*
* 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 2 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 <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <caml/alloc.h>
#include <caml/callback.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/mlvalues.h>
#include "guestfs.h"
#include "visit.h"
#pragma GCC diagnostic ignored "-Wmissing-prototypes"
/* Replacement if caml_alloc_initialized_string is missing, added
* to OCaml runtime in 2017.
*/
#ifndef HAVE_CAML_ALLOC_INITIALIZED_STRING
static inline value
caml_alloc_initialized_string (mlsize_t len, const char *p)
{
value sv = caml_alloc_string (len);
memcpy ((char *) String_val (sv), p, len);
return sv;
}
#endif
struct visitor_function_wrapper_args {
/* In both case we are pointing to local roots, hence why these are
* value* not value.
*/
value *exnp; /* Safe place to store any exception
raised by visitor_function. */
value *fvp; /* visitor_function. */
};
static int visitor_function_wrapper (const char *dir, const char *name, const struct guestfs_statns *stat, const struct guestfs_xattr_list *xattrs, void *opaque);
static value copy_statns (const struct guestfs_statns *statns);
static value copy_xattr (const struct guestfs_xattr *xattr);
static value copy_xattr_list (const struct guestfs_xattr_list *xattrs);
value
guestfs_int_mllib_visit (value gv, value dirv, value fv)
{
CAMLparam3 (gv, dirv, fv);
guestfs_h *g = (guestfs_h *) (intptr_t) Int64_val (gv);
struct visitor_function_wrapper_args args;
/* The dir string could move around when we call the
* visitor_function, so we have to take a full copy of it.
*/
char *dir = strdup (String_val (dirv));
/* This stack address is used to point to the exception, if one is
* raised in the visitor_function.
*/
CAMLlocal1 (exn);
exn = Val_unit;
args.exnp = &exn;
args.fvp = &fv;
if (visit (g, dir, visitor_function_wrapper, &args) == -1) {
free (dir);
if (exn != Val_unit) {
/* The failure was caused by visitor_function raising an
* exception. Re-raise it here.
*/
caml_raise (exn);
}
/* Otherwise it's some other failure. The visit function has
* already printed the error to stderr (XXX - fix), so we raise a
* generic exception.
*/
caml_raise (*caml_named_value ("Visit.Failure"));
}
free (dir);
CAMLreturn (Val_unit);
}
static int
visitor_function_wrapper (const char *dir,
const char *filename,
const struct guestfs_statns *stat,
const struct guestfs_xattr_list *xattrs,
void *opaque)
{
CAMLparam0 ();
CAMLlocal5 (dirv, filenamev, statv, xattrsv, v);
struct visitor_function_wrapper_args *args = opaque;
assert (dir != NULL);
assert (stat != NULL);
assert (xattrs != NULL);
assert (args != NULL);
dirv = caml_copy_string (dir);
if (filename == NULL)
filenamev = Val_int (0); /* None */
else {
filenamev = caml_alloc (1, 0);
v = caml_copy_string (filename);
Store_field (filenamev, 0, v);
}
statv = copy_statns (stat);
xattrsv = copy_xattr_list (xattrs);
/* Call the visitor_function. */
value argsv[4] = { dirv, filenamev, statv, xattrsv };
v = caml_callbackN_exn (*args->fvp, 4, argsv);
if (Is_exception_result (v)) {
/* The visitor_function raised an exception. Store the exception
* in the 'exn' field on the stack of guestfs_int_mllib_visit, and
* return an error.
*/
*args->exnp = Extract_exception (v);
CAMLreturnT (int, -1);
}
/* No error, return normally. */
CAMLreturnT (int, 0);
}
/* The functions below are copied from ocaml/guestfs-c-actions.c. */
static value
copy_statns (const struct guestfs_statns *statns)
{
CAMLparam0 ();
CAMLlocal2 (rv, v);
rv = caml_alloc (22, 0);
v = caml_copy_int64 (statns->st_dev);
Store_field (rv, 0, v);
v = caml_copy_int64 (statns->st_ino);
Store_field (rv, 1, v);
v = caml_copy_int64 (statns->st_mode);
Store_field (rv, 2, v);
v = caml_copy_int64 (statns->st_nlink);
Store_field (rv, 3, v);
v = caml_copy_int64 (statns->st_uid);
Store_field (rv, 4, v);
v = caml_copy_int64 (statns->st_gid);
Store_field (rv, 5, v);
v = caml_copy_int64 (statns->st_rdev);
Store_field (rv, 6, v);
v = caml_copy_int64 (statns->st_size);
Store_field (rv, 7, v);
v = caml_copy_int64 (statns->st_blksize);
Store_field (rv, 8, v);
v = caml_copy_int64 (statns->st_blocks);
Store_field (rv, 9, v);
v = caml_copy_int64 (statns->st_atime_sec);
Store_field (rv, 10, v);
v = caml_copy_int64 (statns->st_atime_nsec);
Store_field (rv, 11, v);
v = caml_copy_int64 (statns->st_mtime_sec);
Store_field (rv, 12, v);
v = caml_copy_int64 (statns->st_mtime_nsec);
Store_field (rv, 13, v);
v = caml_copy_int64 (statns->st_ctime_sec);
Store_field (rv, 14, v);
v = caml_copy_int64 (statns->st_ctime_nsec);
Store_field (rv, 15, v);
v = caml_copy_int64 (statns->st_spare1);
Store_field (rv, 16, v);
v = caml_copy_int64 (statns->st_spare2);
Store_field (rv, 17, v);
v = caml_copy_int64 (statns->st_spare3);
Store_field (rv, 18, v);
v = caml_copy_int64 (statns->st_spare4);
Store_field (rv, 19, v);
v = caml_copy_int64 (statns->st_spare5);
Store_field (rv, 20, v);
v = caml_copy_int64 (statns->st_spare6);
Store_field (rv, 21, v);
CAMLreturn (rv);
}
static value
copy_xattr (const struct guestfs_xattr *xattr)
{
CAMLparam0 ();
CAMLlocal2 (rv, v);
rv = caml_alloc (2, 0);
v = caml_copy_string (xattr->attrname);
Store_field (rv, 0, v);
v = caml_alloc_initialized_string (xattr->attrval_len, xattr->attrval);
Store_field (rv, 1, v);
CAMLreturn (rv);
}
static value
copy_xattr_list (const struct guestfs_xattr_list *xattrs)
{
CAMLparam0 ();
CAMLlocal2 (rv, v);
unsigned int i;
if (xattrs->len == 0)
CAMLreturn (Atom (0));
else {
rv = caml_alloc (xattrs->len, 0);
for (i = 0; i < xattrs->len; ++i) {
v = copy_xattr (&xattrs->val[i]);
Store_field (rv, i, v);
}
CAMLreturn (rv);
}
}
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