server/file.c - wine - Git at Google

 /*
  * Server-side file management
  *
  * Copyright (C) 1998 Alexandre Julliard
  *
  * This 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.
  *
  * This 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 this library; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */

 #include "config.h"
 #include "wine/port.h"

 #include <assert.h>
 #include <fcntl.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <errno.h>
 #ifdef HAVE_SYS_ERRNO_H
 #include <sys/errno.h>
 #endif
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 #ifdef HAVE_UTIME_H
 #include <utime.h>
 #endif
 #ifdef HAVE_POLL_H
 #include <poll.h>
 #endif

 #include "ntstatus.h"
 #define WIN32_NO_STATUS
 #include "windef.h"
 #include "winternl.h"

 #include "file.h"
 #include "handle.h"
 #include "thread.h"
 #include "request.h"

 struct file
 {
     struct object       obj;        /* object header */
     struct fd          *fd;         /* file descriptor for this file */
     unsigned int        access;     /* file access (FILE_READ_DATA etc.) */
     mode_t              mode;       /* file stat.st_mode */
 };

 static unsigned int generic_file_map_access( unsigned int access );

 static void file_dump( struct object *obj, int verbose );
 static struct fd *file_get_fd( struct object *obj );
 static unsigned int file_map_access( struct object *obj, unsigned int access );
 static void file_destroy( struct object *obj );

 static int file_get_poll_events( struct fd *fd );
 static void file_flush( struct fd *fd, struct event **event );
 static enum server_fd_type file_get_fd_type( struct fd *fd );

 static const struct object_ops file_ops =
 {
     sizeof(struct file),          /* size */
     file_dump,                    /* dump */
     add_queue,                    /* add_queue */
     remove_queue,                 /* remove_queue */
     default_fd_signaled,          /* signaled */
     no_satisfied,                 /* satisfied */
     no_signal,                    /* signal */
     file_get_fd,                  /* get_fd */
     file_map_access,              /* map_access */
     no_lookup_name,               /* lookup_name */
     no_open_file,                 /* open_file */
     fd_close_handle,              /* close_handle */
     file_destroy                  /* destroy */
 };

 static const struct fd_ops file_fd_ops =
 {
     file_get_poll_events,         /* get_poll_events */
     default_poll_event,           /* poll_event */
     file_flush,                   /* flush */
     file_get_fd_type,             /* get_fd_type */
     default_fd_ioctl,             /* ioctl */
     default_fd_queue_async,       /* queue_async */
     default_fd_reselect_async,    /* reselect_async */
     default_fd_cancel_async       /* cancel_async */
 };

 static inline int is_overlapped( const struct file *file )
 {
     return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 }

 /* create a file from a file descriptor */
 /* if the function fails the fd is closed */
 static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
 {
     struct file *file;
     struct stat st;

     if (fstat( fd, &st ) == -1)
     {
         file_set_error();
         return NULL;
     }

     if ((file = alloc_object( &file_ops )))
     {
         file->mode = st.st_mode;
         file->access = file_map_access( &file->obj, access );
         if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
                                               FILE_SYNCHRONOUS_IO_NONALERT )))
         {
             release_object( file );
             return NULL;
         }
     }
     return file;
 }

 static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode )
 {
     struct file *file = alloc_object( &file_ops );

     if (!file) return NULL;
     file->access  = access;
     file->mode    = mode;
     file->fd      = fd;
     grab_object( fd );
     set_fd_user( fd, &file_fd_ops, &file->obj );
     return &file->obj;
 }

 static struct object *create_file( const char *nameptr, data_size_t len, unsigned int access,
                                    unsigned int sharing, int create, unsigned int options,
                                    unsigned int attrs )
 {
     struct object *obj = NULL;
     struct fd *fd;
     int flags;
     char *name;
     mode_t mode;

     if (!(name = mem_alloc( len + 1 ))) return NULL;
     memcpy( name, nameptr, len );
     name[len] = 0;

     switch(create)
     {
     case FILE_CREATE:       flags = O_CREAT | O_EXCL; break;
     case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
     case FILE_SUPERSEDE:    flags = O_CREAT | O_TRUNC; break;
     case FILE_OPEN:         flags = 0; break;
     case FILE_OPEN_IF:      flags = O_CREAT; break;
     case FILE_OVERWRITE:    flags = O_TRUNC; break;
     default:                set_error( STATUS_INVALID_PARAMETER ); goto done;
     }

     mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;

     if (len >= 4 &&
         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
         mode |= 0111;

     access = generic_file_map_access( access );

     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
     fd = open_fd( name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
     if (!fd) goto done;

     if (S_ISDIR(mode))
         obj = create_dir_obj( fd );
     else if (S_ISCHR(mode) && is_serial_fd( fd ))
         obj = create_serial( fd );
     else
         obj = create_file_obj( fd, access, mode );

     release_object( fd );

 done:
     free( name );
     return obj;
 }

 /* check if two file objects point to the same file */
 int is_same_file( struct file *file1, struct file *file2 )
 {
     return is_same_file_fd( file1->fd, file2->fd );
 }

 /* create a temp file for anonymous mappings */
 struct file *create_temp_file( int access )
 {
     char tmpfn[16];
     int fd;

     sprintf( tmpfn, "anonmap.XXXXXX" );  /* create it in the server directory */
     fd = mkstemps( tmpfn, 0 );
     if (fd == -1)
     {
         file_set_error();
         return NULL;
     }
     unlink( tmpfn );
     return create_file_for_fd( fd, access, 0 );
 }

 static void file_dump( struct object *obj, int verbose )
 {
     struct file *file = (struct file *)obj;
     assert( obj->ops == &file_ops );
     fprintf( stderr, "File fd=%p\n", file->fd );
 }

 static int file_get_poll_events( struct fd *fd )
 {
     struct file *file = get_fd_user( fd );
     int events = 0;
     assert( file->obj.ops == &file_ops );
     if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
     if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
     return events;
 }

 static void file_flush( struct fd *fd, struct event **event )
 {
     int unix_fd = get_unix_fd( fd );
     if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
 }

 static enum server_fd_type file_get_fd_type( struct fd *fd )
 {
     struct file *file = get_fd_user( fd );

     if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE;
     if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
     return FD_TYPE_CHAR;
 }

 static struct fd *file_get_fd( struct object *obj )
 {
     struct file *file = (struct file *)obj;
     assert( obj->ops == &file_ops );
     return (struct fd *)grab_object( file->fd );
 }

 static unsigned int generic_file_map_access( unsigned int access )
 {
     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 }

 static unsigned int file_map_access( struct object *obj, unsigned int access )
 {
     return generic_file_map_access( access );
 }

 static void file_destroy( struct object *obj )
 {
     struct file *file = (struct file *)obj;
     assert( obj->ops == &file_ops );

     if (file->fd) release_object( file->fd );
 }

 /* set the last error depending on errno */
 void file_set_error(void)
 {
     switch (errno)
     {
     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
     case EACCES:
     case ESRCH:
     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
     case EROFS:     set_error( STATUS_MEDIA_WRITE_PROTECTED ); break;
     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
     case ENFILE:
     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
     case ESPIPE:    set_error( STATUS_ILLEGAL_FUNCTION ); break;
     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 #ifdef EOVERFLOW
     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 #endif
     default:        perror("file_set_error"); set_error( STATUS_UNSUCCESSFUL ); break;
     }
 }

 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 {
     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 }

 int get_file_unix_fd( struct file *file )
 {
     return get_unix_fd( file->fd );
 }

 struct file *grab_file_unless_removable( struct file *file )
 {
     if (is_fd_removable( file->fd )) return NULL;
     return (struct file *)grab_object( file );
 }

 /* extend a file beyond the current end of file */
 static int extend_file( struct file *file, file_pos_t new_size )
 {
     static const char zero;
     int unix_fd = get_file_unix_fd( file );
     off_t size = new_size;

     if (unix_fd == -1) return 0;

     if (sizeof(new_size) > sizeof(size) && size != new_size)
     {
         set_error( STATUS_INVALID_PARAMETER );
         return 0;
     }
     /* extend the file one byte beyond the requested size and then truncate it */
     /* this should work around ftruncate implementations that can't extend files */
     if (pwrite( unix_fd, &zero, 1, size ) != -1)
     {
         ftruncate( unix_fd, size );
         return 1;
     }
     file_set_error();
     return 0;
 }

 /* try to grow the file to the specified size */
 int grow_file( struct file *file, file_pos_t size )
 {
     struct stat st;
     int unix_fd = get_file_unix_fd( file );

     if (unix_fd == -1) return 0;

     if (fstat( unix_fd, &st ) == -1)
     {
         file_set_error();
         return 0;
     }
     if (st.st_size >= size) return 1;  /* already large enough */
     return extend_file( file, size );
 }

 /* create a file */
 DECL_HANDLER(create_file)
 {
     struct object *file;

     reply->handle = 0;
     if ((file = create_file( get_req_data(), get_req_data_size(), req->access,
                              req->sharing, req->create, req->options, req->attrs )))
     {
         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
         release_object( file );
     }
 }

 /* allocate a file handle for a Unix fd */
 DECL_HANDLER(alloc_file_handle)
 {
     struct file *file;
     int fd;

     reply->handle = 0;
     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
     {
         set_error( STATUS_INVALID_HANDLE );
         return;
     }
     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
     {
         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
         release_object( file );
     }
 }

 /* lock a region of a file */
 DECL_HANDLER(lock_file)
 {
     struct file *file;
     file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
     file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;

     if ((file = get_file_obj( current->process, req->handle, 0 )))
     {
         reply->handle = lock_fd( file->fd, offset, count, req->shared, req->wait );
         reply->overlapped = is_overlapped( file );
         release_object( file );
     }
 }

 /* unlock a region of a file */
 DECL_HANDLER(unlock_file)
 {
     struct file *file;
     file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
     file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;

     if ((file = get_file_obj( current->process, req->handle, 0 )))
     {
         unlock_fd( file->fd, offset, count );
         release_object( file );
     }
 }
	/*
	* Server-side file management
	*
	* Copyright (C) 1998 Alexandre Julliard
	*
	* This 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.
	*
	* This 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 this library; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
	*/

	#include "config.h"
	#include "wine/port.h"

	#include <assert.h>
	#include <fcntl.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <string.h>
	#include <stdlib.h>
	#include <errno.h>
	#ifdef HAVE_SYS_ERRNO_H
	#include <sys/errno.h>
	#endif
	#include <sys/stat.h>
	#include <sys/time.h>
	#include <sys/types.h>
	#include <time.h>
	#include <unistd.h>
	#ifdef HAVE_UTIME_H
	#include <utime.h>
	#endif
	#ifdef HAVE_POLL_H
	#include <poll.h>
	#endif

	#include "ntstatus.h"
	#define WIN32_NO_STATUS
	#include "windef.h"
	#include "winternl.h"

	#include "file.h"
	#include "handle.h"
	#include "thread.h"
	#include "request.h"

	struct file
	{
	struct object obj; /* object header */
	struct fd fd; / file descriptor for this file */
	unsigned int access; /* file access (FILE_READ_DATA etc.) */
	mode_t mode; /* file stat.st_mode */
	};

	static unsigned int generic_file_map_access( unsigned int access );

	static void file_dump( struct object *obj, int verbose );
	static struct fd file_get_fd( struct object obj );
	static unsigned int file_map_access( struct object *obj, unsigned int access );
	static void file_destroy( struct object *obj );

	static int file_get_poll_events( struct fd *fd );
	static void file_flush( struct fd fd, struct event *event );
	static enum server_fd_type file_get_fd_type( struct fd *fd );

	static const struct object_ops file_ops =
	{
	sizeof(struct file), /* size */
	file_dump, /* dump */
	add_queue, /* add_queue */
	remove_queue, /* remove_queue */
	default_fd_signaled, /* signaled */
	no_satisfied, /* satisfied */
	no_signal, /* signal */
	file_get_fd, /* get_fd */
	file_map_access, /* map_access */
	no_lookup_name, /* lookup_name */
	no_open_file, /* open_file */
	fd_close_handle, /* close_handle */
	file_destroy /* destroy */
	};

	static const struct fd_ops file_fd_ops =
	{
	file_get_poll_events, /* get_poll_events */
	default_poll_event, /* poll_event */
	file_flush, /* flush */
	file_get_fd_type, /* get_fd_type */
	default_fd_ioctl, /* ioctl */
	default_fd_queue_async, /* queue_async */
	default_fd_reselect_async, /* reselect_async */
	default_fd_cancel_async /* cancel_async */
	};

	static inline int is_overlapped( const struct file *file )
	{
	return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT \| FILE_SYNCHRONOUS_IO_NONALERT));
	}

	/* create a file from a file descriptor */
	/* if the function fails the fd is closed */
	static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
	{
	struct file *file;
	struct stat st;

	if (fstat( fd, &st ) == -1)
	{
	file_set_error();
	return NULL;
	}

	if ((file = alloc_object( &file_ops )))
	{
	file->mode = st.st_mode;
	file->access = file_map_access( &file->obj, access );
	if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
	FILE_SYNCHRONOUS_IO_NONALERT )))
	{
	release_object( file );
	return NULL;
	}
	}
	return file;
	}

	static struct object create_file_obj( struct fd fd, unsigned int access, mode_t mode )
	{
	struct file *file = alloc_object( &file_ops );

	if (!file) return NULL;
	file->access = access;
	file->mode = mode;
	file->fd = fd;
	grab_object( fd );
	set_fd_user( fd, &file_fd_ops, &file->obj );
	return &file->obj;
	}

	static struct object create_file( const char nameptr, data_size_t len, unsigned int access,
	unsigned int sharing, int create, unsigned int options,
	unsigned int attrs )
	{
	struct object *obj = NULL;
	struct fd *fd;
	int flags;
	char *name;
	mode_t mode;

	if (!(name = mem_alloc( len + 1 ))) return NULL;
	memcpy( name, nameptr, len );
	name[len] = 0;

	switch(create)
	{
	case FILE_CREATE: flags = O_CREAT \| O_EXCL; break;
	case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
	case FILE_SUPERSEDE: flags = O_CREAT \| O_TRUNC; break;
	case FILE_OPEN: flags = 0; break;
	case FILE_OPEN_IF: flags = O_CREAT; break;
	case FILE_OVERWRITE: flags = O_TRUNC; break;
	default: set_error( STATUS_INVALID_PARAMETER ); goto done;
	}

	mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;

	if (len >= 4 &&
	(!strcasecmp( name + len - 4, ".exe" ) \|\| !strcasecmp( name + len - 4, ".com" )))
	mode \|= 0111;

	access = generic_file_map_access( access );

	/* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
	fd = open_fd( name, flags \| O_NONBLOCK \| O_LARGEFILE, &mode, access, sharing, options );
	if (!fd) goto done;

	if (S_ISDIR(mode))
	obj = create_dir_obj( fd );
	else if (S_ISCHR(mode) && is_serial_fd( fd ))
	obj = create_serial( fd );
	else
	obj = create_file_obj( fd, access, mode );

	release_object( fd );

	done:
	free( name );
	return obj;
	}

	/* check if two file objects point to the same file */
	int is_same_file( struct file file1, struct file file2 )
	{
	return is_same_file_fd( file1->fd, file2->fd );
	}

	/* create a temp file for anonymous mappings */
	struct file *create_temp_file( int access )
	{
	char tmpfn[16];
	int fd;

	sprintf( tmpfn, "anonmap.XXXXXX" ); /* create it in the server directory */
	fd = mkstemps( tmpfn, 0 );
	if (fd == -1)
	{
	file_set_error();
	return NULL;
	}
	unlink( tmpfn );
	return create_file_for_fd( fd, access, 0 );
	}

	static void file_dump( struct object *obj, int verbose )
	{
	struct file file = (struct file )obj;
	assert( obj->ops == &file_ops );
	fprintf( stderr, "File fd=%p\n", file->fd );
	}

	static int file_get_poll_events( struct fd *fd )
	{
	struct file *file = get_fd_user( fd );
	int events = 0;
	assert( file->obj.ops == &file_ops );
	if (file->access & FILE_UNIX_READ_ACCESS) events \|= POLLIN;
	if (file->access & FILE_UNIX_WRITE_ACCESS) events \|= POLLOUT;
	return events;
	}

	static void file_flush( struct fd fd, struct event *event )
	{
	int unix_fd = get_unix_fd( fd );
	if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
	}

	static enum server_fd_type file_get_fd_type( struct fd *fd )
	{
	struct file *file = get_fd_user( fd );

	if (S_ISREG(file->mode) \|\| S_ISBLK(file->mode)) return FD_TYPE_FILE;
	if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
	return FD_TYPE_CHAR;
	}

	static struct fd file_get_fd( struct object obj )
	{
	struct file file = (struct file )obj;
	assert( obj->ops == &file_ops );
	return (struct fd *)grab_object( file->fd );
	}

	static unsigned int generic_file_map_access( unsigned int access )
	{
	if (access & GENERIC_READ) access \|= FILE_GENERIC_READ;
	if (access & GENERIC_WRITE) access \|= FILE_GENERIC_WRITE;
	if (access & GENERIC_EXECUTE) access \|= FILE_GENERIC_EXECUTE;
	if (access & GENERIC_ALL) access \|= FILE_ALL_ACCESS;
	return access & ~(GENERIC_READ \| GENERIC_WRITE \| GENERIC_EXECUTE \| GENERIC_ALL);
	}

	static unsigned int file_map_access( struct object *obj, unsigned int access )
	{
	return generic_file_map_access( access );
	}

	static void file_destroy( struct object *obj )
	{
	struct file file = (struct file )obj;
	assert( obj->ops == &file_ops );

	if (file->fd) release_object( file->fd );
	}

	/* set the last error depending on errno */
	void file_set_error(void)
	{
	switch (errno)
	{
	case EAGAIN: set_error( STATUS_SHARING_VIOLATION ); break;
	case EBADF: set_error( STATUS_INVALID_HANDLE ); break;
	case ENOSPC: set_error( STATUS_DISK_FULL ); break;
	case EACCES:
	case ESRCH:
	case EPERM: set_error( STATUS_ACCESS_DENIED ); break;
	case EROFS: set_error( STATUS_MEDIA_WRITE_PROTECTED ); break;
	case EBUSY: set_error( STATUS_FILE_LOCK_CONFLICT ); break;
	case ENOENT: set_error( STATUS_NO_SUCH_FILE ); break;
	case EISDIR: set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
	case ENFILE:
	case EMFILE: set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
	case EEXIST: set_error( STATUS_OBJECT_NAME_COLLISION ); break;
	case EINVAL: set_error( STATUS_INVALID_PARAMETER ); break;
	case ESPIPE: set_error( STATUS_ILLEGAL_FUNCTION ); break;
	case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
	case EIO: set_error( STATUS_ACCESS_VIOLATION ); break;
	case ENOTDIR: set_error( STATUS_NOT_A_DIRECTORY ); break;
	case EFBIG: set_error( STATUS_SECTION_TOO_BIG ); break;
	case ENODEV: set_error( STATUS_NO_SUCH_DEVICE ); break;
	case ENXIO: set_error( STATUS_NO_SUCH_DEVICE ); break;
	#ifdef EOVERFLOW
	case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
	#endif
	default: perror("file_set_error"); set_error( STATUS_UNSUCCESSFUL ); break;
	}
	}

	struct file get_file_obj( struct process process, obj_handle_t handle, unsigned int access )
	{
	return (struct file *)get_handle_obj( process, handle, access, &file_ops );
	}

	int get_file_unix_fd( struct file *file )
	{
	return get_unix_fd( file->fd );
	}

	struct file grab_file_unless_removable( struct file file )
	{
	if (is_fd_removable( file->fd )) return NULL;
	return (struct file *)grab_object( file );
	}

	/* extend a file beyond the current end of file */
	static int extend_file( struct file *file, file_pos_t new_size )
	{
	static const char zero;
	int unix_fd = get_file_unix_fd( file );
	off_t size = new_size;

	if (unix_fd == -1) return 0;

	if (sizeof(new_size) > sizeof(size) && size != new_size)
	{
	set_error( STATUS_INVALID_PARAMETER );
	return 0;
	}
	/* extend the file one byte beyond the requested size and then truncate it */
	/* this should work around ftruncate implementations that can't extend files */
	if (pwrite( unix_fd, &zero, 1, size ) != -1)
	{
	ftruncate( unix_fd, size );
	return 1;
	}
	file_set_error();
	return 0;
	}

	/* try to grow the file to the specified size */
	int grow_file( struct file *file, file_pos_t size )
	{
	struct stat st;
	int unix_fd = get_file_unix_fd( file );

	if (unix_fd == -1) return 0;

	if (fstat( unix_fd, &st ) == -1)
	{
	file_set_error();
	return 0;
	}
	if (st.st_size >= size) return 1; /* already large enough */
	return extend_file( file, size );
	}

	/* create a file */
	DECL_HANDLER(create_file)
	{
	struct object *file;

	reply->handle = 0;
	if ((file = create_file( get_req_data(), get_req_data_size(), req->access,
	req->sharing, req->create, req->options, req->attrs )))
	{
	reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
	release_object( file );
	}
	}

	/* allocate a file handle for a Unix fd */
	DECL_HANDLER(alloc_file_handle)
	{
	struct file *file;
	int fd;

	reply->handle = 0;
	if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
	{
	set_error( STATUS_INVALID_HANDLE );
	return;
	}
	if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ \| FILE_SHARE_WRITE )))
	{
	reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
	release_object( file );
	}
	}

	/* lock a region of a file */
	DECL_HANDLER(lock_file)
	{
	struct file *file;
	file_pos_t offset = ((file_pos_t)req->offset_high << 32) \| req->offset_low;
	file_pos_t count = ((file_pos_t)req->count_high << 32) \| req->count_low;

	if ((file = get_file_obj( current->process, req->handle, 0 )))
	{
	reply->handle = lock_fd( file->fd, offset, count, req->shared, req->wait );
	reply->overlapped = is_overlapped( file );
	release_object( file );
	}
	}

	/* unlock a region of a file */
	DECL_HANDLER(unlock_file)
	{
	struct file *file;
	file_pos_t offset = ((file_pos_t)req->offset_high << 32) \| req->offset_low;
	file_pos_t count = ((file_pos_t)req->count_high << 32) \| req->count_low;

	if ((file = get_file_obj( current->process, req->handle, 0 )))
	{
	unlock_fd( file->fd, offset, count );
	release_object( file );
	}
	}