mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 22:00:08 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
/* chown() compatibility.
|
|
Copyright (C) 1998, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C 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.
|
|
|
|
The GNU C 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 the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <limits.h>
|
|
#include <sys/syscall.h>
|
|
#include <stdlib.h>
|
|
|
|
/*
|
|
In Linux 2.1.x the chown functions have been changed. A new function lchown
|
|
was introduced. The new chown now follows symlinks - the old chown and the
|
|
new lchown do not follow symlinks.
|
|
This file emulates chown() under the old kernels.
|
|
*/
|
|
|
|
extern int __syscall_chown (const char *__file,
|
|
uid_t __owner, gid_t __group);
|
|
|
|
int
|
|
__chown (const char *file, uid_t owner, gid_t group)
|
|
{
|
|
int err;
|
|
int old_errno;
|
|
char link[PATH_MAX+2];
|
|
char path[2*PATH_MAX+4];
|
|
int loopct;
|
|
int filelen;
|
|
static int libc_old_chown = 0 /* -1=old linux, 1=new linux, 0=unknown */;
|
|
|
|
if (libc_old_chown == 1)
|
|
return __syscall_chown (file, owner, group);
|
|
|
|
old_errno = errno;
|
|
|
|
#ifdef __NR_lchown
|
|
if (libc_old_chown == 0)
|
|
{
|
|
err = __syscall_chown (file, owner, group);
|
|
if (err != -1 || errno != ENOSYS)
|
|
{
|
|
libc_old_chown = 1;
|
|
return err;
|
|
}
|
|
libc_old_chown = -1;
|
|
}
|
|
#endif
|
|
|
|
err = __readlink (file, link, PATH_MAX+1);
|
|
if (err == -1)
|
|
{
|
|
errno = old_errno;
|
|
return __lchown(file, owner, group);
|
|
}
|
|
|
|
filelen = strlen (file) + 1;
|
|
if (filelen > sizeof(path))
|
|
{
|
|
errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
memcpy (path, file, filelen);
|
|
|
|
/* 'The system has an arbitrary limit...' In practise, we'll hit
|
|
ENAMETOOLONG before this, usually. */
|
|
for (loopct = 0; loopct < 128; loopct++)
|
|
{
|
|
int linklen;
|
|
|
|
if (err >= PATH_MAX+1)
|
|
{
|
|
errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
|
|
link[err] = 0; /* Null-terminate string, just-in-case. */
|
|
|
|
linklen = strlen (link) + 1;
|
|
|
|
if (link[0] == '/')
|
|
memcpy (path, link, linklen);
|
|
else
|
|
{
|
|
filelen = strlen (path);
|
|
|
|
while (filelen > 1 && path[filelen-1] == '/')
|
|
filelen--;
|
|
while (filelen > 0 && path[filelen-1] != '/')
|
|
filelen--;
|
|
if (filelen + linklen > sizeof(path))
|
|
{
|
|
errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
memcpy (path+filelen, link, linklen);
|
|
}
|
|
|
|
err = __readlink(path, link, PATH_MAX+1);
|
|
|
|
if (err == -1)
|
|
{
|
|
errno = old_errno;
|
|
return __lchown(path, owner, group);
|
|
}
|
|
}
|
|
errno = ELOOP;
|
|
return -1;
|
|
}
|
|
|
|
#include <shlib-compat.h>
|
|
versioned_symbol (libc, __chown, chown, GLIBC_2_1);
|