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/*
File: acl_get_fd.c
Copyright (C) 1999, 2000
Andreas Gruenbacher, <andreas.gruenbacher@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/xattr.h>
#include "libacl.h"
#include "__acl_from_xattr.h"
#include "byteorder.h"
#include "acl_ea.h"
/* 23.4.15 */
acl_t
acl_get_fd(int fd)
{
const size_t size_guess = acl_ea_size(16);
char *ext_acl_p = alloca(size_guess);
int retval;
if (!ext_acl_p)
return NULL;
retval = fgetxattr(fd, ACL_EA_ACCESS, ext_acl_p, size_guess);
if (retval == -1 && errno == ERANGE) {
retval = fgetxattr(fd, ACL_EA_ACCESS, NULL, 0);
if (retval > 0) {
ext_acl_p = alloca(retval);
if (!ext_acl_p)
return NULL;
retval = fgetxattr(fd, ACL_EA_ACCESS, ext_acl_p,retval);
}
}
if (retval > 0) {
acl_t acl = __acl_from_xattr(ext_acl_p, retval);
return acl;
} else if (retval == 0 || errno == ENOATTR || errno == ENODATA) {
struct stat st;
if (fstat(fd, &st) == 0)
return acl_from_mode(st.st_mode);
else
return NULL;
} else
return NULL;
}
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