adtools/clib2

/*
 * $Id: unistd_fchown.c,v 1.15 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 _UNISTD_HEADERS_H
#include "unistd_headers.h"
#endif /* _UNISTD_HEADERS_H */

/****************************************************************************/

/* The following is not part of the ISO 'C' (1994) standard. */

/****************************************************************************/

int
fchown(int file_descriptor, uid_t owner, gid_t group)
{
    D_S(struct FileInfoBlock,fib);
    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(owner);
    SHOWVALUE(group);

    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;
    }

    PROFILE_OFF();
    success = (__safe_examine_file_handle(fd->fd_File,fib) && (parent_dir = __safe_parent_of_file_handle(fd->fd_File)) != ZERO);
    PROFILE_ON();

    if(NO success)
    {
        SHOWMSG("couldn't find parent directory");

        __set_errno(__translate_io_error_to_errno(IoErr()));
        goto out;
    }

    old_current_dir = CurrentDir(parent_dir);
    current_dir_changed = TRUE;

    /* A value of -1 for either the owner or the group ID means
       that what's currently being used should not be changed. */
    if(owner == (uid_t)-1)
        owner = fib->fib_OwnerUID;

    if(group == (gid_t)-1)
        group = fib->fib_OwnerGID;

    /* Check if the owner and group IDs are usable. This test
       follows the comparison against -1 above just so that we
       can be sure that we are not mistaking a -1 for a
       large unsigned number. */
    if(owner > 65535 || group > 65535)
    {
        SHOWMSG("owner or group not OK");

        SHOWVALUE(owner);
        SHOWVALUE(group);

        __set_errno(EINVAL);
        goto out;
    }

    /* Did anything change at all? */
    if(group != fib->fib_OwnerUID || owner != fib->fib_OwnerUID)
    {
        PROFILE_OFF();

        #if defined(__amigaos4__)
        {
            success = SetOwner(fib->fib_FileName,(LONG)((((ULONG)owner) << 16) | (ULONG)group));
        }
        #else
        {
            if(((struct Library *)DOSBase)->lib_Version >= 39)
            {
                success = SetOwner(fib->fib_FileName,(LONG)((((ULONG)owner) << 16) | (ULONG)group));
            }
            else
            {
                D_S(struct bcpl_name,new_name);
                struct DevProc * dvp;
                unsigned int len;

                SHOWMSG("have to do this manually...");

                success = DOSFALSE;

                len = strlen(fib->fib_FileName);

                assert( len < sizeof(new_name->name) );

                dvp = GetDeviceProc(fib->fib_FileName,NULL);
                if(dvp != NULL)
                {
                    LONG error;

                    new_name->name[0] = len;
                    memmove(&new_name->name[1],fib->fib_FileName,len);

                    success    = DoPkt(dvp->dvp_Port,ACTION_SET_OWNER,0,dvp->dvp_Lock,MKBADDR(new_name),(LONG)((((ULONG)owner) << 16) | (ULONG)group),0);
                    error    = IoErr();

                    FreeDeviceProc(dvp);

                    SetIoErr(error);
                }
            }
        }
        #endif /* __amigaos4__ */

        PROFILE_ON();

        if(NO success)
        {
            SHOWMSG("couldn't change owner/group");

            __set_errno(__translate_io_error_to_errno(IoErr()));
            goto out;
        }
    }

    result = OK;

 out:

    __fd_unlock(fd);

    PROFILE_OFF();

    UnLock(parent_dir);

    if(current_dir_changed)
        CurrentDir(old_current_dir);

    PROFILE_ON();

    __stdio_unlock();

    RETURN(result);
    return(result);
}