This system call has five arguments, of which one is a 64-bit uid_t, and another is a 64-bit gid_t, which means that 7 registers are needed. However, x86 only has 5 registers available for system calls. Wrap the system call with a structure like with mmap(2).
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
|
|
* Copyright (c) 2012, 2016 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* unistd/fchownat.c
|
|
* Changes the owner and group of a file.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/syscall.h>
|
|
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#if !defined(__i386__)
|
|
|
|
DEFN_SYSCALL5(int, sys_fchownat, SYSCALL_FCHOWNAT, int, const char*, uid_t, gid_t, int);
|
|
|
|
int fchownat(int dirfd, const char* path, uid_t owner, gid_t group, int flags)
|
|
{
|
|
return sys_fchownat(dirfd, path, owner, group, flags);
|
|
}
|
|
|
|
#else
|
|
|
|
// TODO: The i386 system call ABI doesn't have enough registers to do this with
|
|
// 64-bit uid_t and gid_t.
|
|
|
|
struct fchownat_request /* duplicated in kernel/io.cpp */
|
|
{
|
|
int dirfd;
|
|
const char* path;
|
|
uid_t owner;
|
|
gid_t group;
|
|
int flags;
|
|
};
|
|
|
|
DEFN_SYSCALL1(int, sys_fchownat_wrapper, SYSCALL_FCHOWNAT, const struct fchownat_request*);
|
|
|
|
int fchownat(int dirfd, const char* path, uid_t owner, gid_t group, int flags)
|
|
{
|
|
struct fchownat_request request = { dirfd, path, owner, group, flags };
|
|
return sys_fchownat_wrapper(&request);
|
|
}
|
|
|
|
#endif
|