library/stat_fchmod.c
/*
* $Id: stat_fchmod.c,v 1.13 2006-11-16 14:39:23 obarthel Exp $
*
* :ts=4
*
* Portable ISO 'C' (1994) runtime library for the Amiga computer
* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Neither the name of Olaf Barthel nor the names of contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _STAT_HEADERS_H
#include "stat_headers.h"
#endif /* _STAT_HEADERS_H */
/****************************************************************************/
/* The following is not part of the ISO 'C' (1994) standard. */
/****************************************************************************/
int
fchmod(int file_descriptor, mode_t mode)
{
D_S(struct FileInfoBlock,fib);
ULONG protection;
BPTR parent_dir = ZERO;
BPTR old_current_dir = ZERO;
BOOL current_dir_changed = FALSE;
int result = ERROR;
struct fd * fd = NULL;
LONG success;
ENTER();
SHOWVALUE(file_descriptor);
SHOWVALUE(mode);
assert( file_descriptor >= 0 && file_descriptor < __num_fd );
assert( __fd[file_descriptor] != NULL );
assert( FLAG_IS_SET(__fd[file_descriptor]->fd_Flags,FDF_IN_USE) );
if(__check_abort_enabled)
__check_abort();
__stdio_lock();
fd = __get_file_descriptor(file_descriptor);
if(fd == NULL)
{
__set_errno(EBADF);
goto out;
}
__fd_lock(fd);
if(FLAG_IS_SET(fd->fd_Flags,FDF_IS_SOCKET))
{
__set_errno(EINVAL);
goto out;
}
if(FLAG_IS_SET(fd->fd_Flags,FDF_STDIO))
{
__set_errno(EBADF);
goto out;
}
protection = 0;
if(FLAG_IS_SET(mode,S_IRUSR))
SET_FLAG(protection,FIBF_READ);
if(FLAG_IS_SET(mode,S_IWUSR))
{
SET_FLAG(protection,FIBF_WRITE);
SET_FLAG(protection,FIBF_DELETE);
}
if(FLAG_IS_SET(mode,S_IXUSR))
SET_FLAG(protection,FIBF_EXECUTE);
if(FLAG_IS_SET(mode,S_IRGRP))
SET_FLAG(protection,FIBF_GRP_READ);
if(FLAG_IS_SET(mode,S_IWGRP))
{
SET_FLAG(protection,FIBF_GRP_WRITE);
SET_FLAG(protection,FIBF_GRP_DELETE);
}
if(FLAG_IS_SET(mode,S_IXGRP))
SET_FLAG(protection,FIBF_GRP_EXECUTE);
if(FLAG_IS_SET(mode,S_IROTH))
SET_FLAG(protection,FIBF_OTR_READ);
if(FLAG_IS_SET(mode,S_IWOTH))
{
SET_FLAG(protection,FIBF_OTR_WRITE);
SET_FLAG(protection,FIBF_OTR_DELETE);
}
if(FLAG_IS_SET(mode,S_IXOTH))
SET_FLAG(protection,FIBF_OTR_EXECUTE);
PROFILE_OFF();
parent_dir = __safe_parent_of_file_handle(fd->fd_File);
PROFILE_ON();
if(parent_dir == ZERO)
{
SHOWMSG("couldn't find parent directory");
__set_errno(__translate_io_error_to_errno(IoErr()));
goto out;
}
PROFILE_OFF();
success = __safe_examine_file_handle(fd->fd_File,fib);
PROFILE_ON();
if(NO success)
{
SHOWMSG("could not obtain file name");
__set_errno(__translate_io_error_to_errno(IoErr()));
goto out;
}
old_current_dir = CurrentDir(parent_dir);
current_dir_changed = TRUE;
PROFILE_OFF();
success = SetProtection(fib->fib_FileName,protection ^ (FIBF_READ|FIBF_WRITE|FIBF_EXECUTE|FIBF_DELETE));
PROFILE_ON();
if(NO success)
{
SHOWMSG("could not change protection bits");
__set_errno(__translate_io_error_to_errno(IoErr()));
goto out;
}
result = OK;
out:
__fd_unlock(fd);
__stdio_unlock();
if(current_dir_changed)
CurrentDir(old_current_dir);
UnLock(parent_dir);
RETURN(result);
return(result);
}