adtools/clib2

/*
 * $Id: unistd_unlink.c,v 1.11 2006-09-27 09:40:06 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 _STDLIB_NULL_POINTER_CHECK_H
#include "stdlib_null_pointer_check.h"
#endif /* _STDLIB_NULL_POINTER_CHECK_H */

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

#ifndef _UNISTD_HEADERS_H
#include "unistd_headers.h"
#endif /* _UNISTD_HEADERS_H */

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

#ifndef _STDLIB_MEMORY_H
#include "stdlib_memory.h"
#endif /* _STDLIB_MEMORY_H */

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

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

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

int
unlink(const char * path_name)
{
    #if defined(UNIX_PATH_SEMANTICS)
    DECLARE_UTILITYBASE();
    struct name_translation_info path_name_nti;
    #endif /* UNIX_PATH_SEMANTICS */
    BPTR current_dir = ZERO;
    int result = ERROR;
    LONG status;

    ENTER();

    SHOWSTRING(path_name);

    assert( path_name != NULL );

    if(__check_abort_enabled)
        __check_abort();

    #if defined(CHECK_FOR_NULL_POINTERS)
    {
        if(path_name == NULL)
        {
            SHOWMSG("invalid path name");

            __set_errno(EFAULT);
            goto out;
        }
    }
    #endif /* CHECK_FOR_NULL_POINTERS */

    #if defined(UNIX_PATH_SEMANTICS)
    {
        if(__unix_path_semantics)
        {
            if(path_name[0] == '\0')
            {
                SHOWMSG("no name given");

                __set_errno(ENOENT);
                goto out;
            }

            if(__translate_unix_to_amiga_path_name(&path_name,&path_name_nti) != 0)
                goto out;

            if(path_name_nti.is_root)
            {
                __set_errno(EACCES);
                goto out;
            }
        }
    }
    #endif /* UNIX_PATH_SEMANTICS */

    D(("trying to delete '%s'",path_name));

    PROFILE_OFF();
    status = DeleteFile((STRPTR)path_name);
    PROFILE_ON();

    if(status == DOSFALSE)
    {
        #if defined(UNIX_PATH_SEMANTICS)
        {
            struct UnlinkNode * uln = NULL;
            struct UnlinkNode * node;
            BOOL found = FALSE;

            assert( UtilityBase != NULL );

            if(NOT __unlink_retries || IoErr() != ERROR_OBJECT_IN_USE)
            {
                __set_errno(__translate_access_io_error_to_errno(IoErr()));
                goto out;
            }

            SHOWMSG("will try to delete that file later");

            /* ZZZ we should be locking the path's parent directory
               and then just remember what the last part of the path
               pointed to. */
            PROFILE_OFF();
            current_dir = Lock("",SHARED_LOCK);
            PROFILE_ON();

            if(current_dir == ZERO)
            {
                __set_errno(__translate_io_error_to_errno(IoErr()));
                goto out;
            }

            PROFILE_OFF();

            ObtainSemaphore(&__unlink_semaphore);

            assert( __unlink_list.mlh_Head != NULL );

            for(node = (struct UnlinkNode *)__unlink_list.mlh_Head ;
                node->uln_MinNode.mln_Succ != NULL ;
                node = (struct UnlinkNode *)node->uln_MinNode.mln_Succ)
            {
                if(Stricmp(node->uln_Name,path_name) == SAME && SameLock(node->uln_Lock,current_dir) == LOCK_SAME)
                {
                    found = TRUE;
                    break;
                }
            }

            PROFILE_ON();

            if(NOT found)
            {
                uln = malloc(sizeof(*uln) + strlen(path_name) + 1);
                if(uln != NULL)
                {
                    uln->uln_Lock = current_dir;
                    uln->uln_Name = (char *)(uln + 1);

                    strcpy(uln->uln_Name,path_name);
                    AddTail((struct List *)&__unlink_list,(struct Node *)uln);

                    current_dir = ZERO;
                }
            }

            ReleaseSemaphore(&__unlink_semaphore);

            if(NOT found && uln == NULL)
            {
                __set_errno(ENOMEM);
                goto out;
            }
        }
        #else
        {
            __set_errno(__translate_io_error_to_errno(IoErr()));
            goto out;
        }
        #endif /* UNIX_PATH_SEMANTICS */
    }

    result = OK;

 out:

    PROFILE_OFF();
    UnLock(current_dir);
    PROFILE_ON();

    RETURN(result);
    return(result);
}