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425 lines
13 KiB
C
425 lines
13 KiB
C
/*
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* Server-side file management
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*
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* Copyright (C) 1998 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifdef HAVE_SYS_ERRNO_H
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#include <sys/errno.h>
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#endif
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#ifdef HAVE_UTIME_H
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#include <utime.h>
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#endif
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winternl.h"
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#include "file.h"
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#include "handle.h"
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#include "thread.h"
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#include "request.h"
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struct file
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{
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struct object obj; /* object header */
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struct fd *fd; /* file descriptor for this file */
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unsigned int access; /* file access (FILE_READ_DATA etc.) */
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unsigned int options; /* file options (FILE_DELETE_ON_CLOSE, FILE_SYNCHRONOUS...) */
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};
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static unsigned int generic_file_map_access( unsigned int access );
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static void file_dump( struct object *obj, int verbose );
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static struct fd *file_get_fd( struct object *obj );
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static unsigned int file_map_access( struct object *obj, unsigned int access );
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static void file_destroy( struct object *obj );
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static int file_get_poll_events( struct fd *fd );
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static void file_flush( struct fd *fd, struct event **event );
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static enum server_fd_type file_get_info( struct fd *fd, int *flags );
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static const struct object_ops file_ops =
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{
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sizeof(struct file), /* size */
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file_dump, /* dump */
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default_fd_add_queue, /* add_queue */
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default_fd_remove_queue, /* remove_queue */
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default_fd_signaled, /* signaled */
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no_satisfied, /* satisfied */
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no_signal, /* signal */
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file_get_fd, /* get_fd */
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file_map_access, /* map_access */
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no_lookup_name, /* lookup_name */
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no_open_file, /* open_file */
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fd_close_handle, /* close_handle */
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file_destroy /* destroy */
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};
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static const struct fd_ops file_fd_ops =
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{
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file_get_poll_events, /* get_poll_events */
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default_poll_event, /* poll_event */
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file_flush, /* flush */
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file_get_info, /* get_file_info */
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default_fd_queue_async, /* queue_async */
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default_fd_cancel_async /* cancel_async */
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};
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static inline int is_overlapped( const struct file *file )
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{
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return !(file->options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
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}
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/* create a file from a file descriptor */
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/* if the function fails the fd is closed */
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static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
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{
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struct file *file;
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if ((file = alloc_object( &file_ops )))
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{
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file->access = file_map_access( &file->obj, access );
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file->options = FILE_SYNCHRONOUS_IO_NONALERT;
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if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj )))
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{
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release_object( file );
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return NULL;
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}
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}
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return file;
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}
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static struct object *create_file_obj( struct fd *fd, unsigned int access, unsigned int options )
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{
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struct file *file = alloc_object( &file_ops );
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if (!file) return NULL;
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file->access = access;
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file->options = options;
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file->fd = fd;
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grab_object( fd );
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set_fd_user( fd, &file_fd_ops, &file->obj );
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return &file->obj;
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}
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static struct object *create_file( const char *nameptr, data_size_t len, unsigned int access,
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unsigned int sharing, int create, unsigned int options,
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unsigned int attrs )
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{
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struct object *obj = NULL;
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struct fd *fd;
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int flags;
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char *name;
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mode_t mode;
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if (!(name = mem_alloc( len + 1 ))) return NULL;
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memcpy( name, nameptr, len );
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name[len] = 0;
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switch(create)
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{
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case FILE_CREATE: flags = O_CREAT | O_EXCL; break;
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case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
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case FILE_SUPERSEDE: flags = O_CREAT | O_TRUNC; break;
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case FILE_OPEN: flags = 0; break;
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case FILE_OPEN_IF: flags = O_CREAT; break;
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case FILE_OVERWRITE: flags = O_TRUNC; break;
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default: set_error( STATUS_INVALID_PARAMETER ); goto done;
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}
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mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
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if (len >= 4 &&
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(!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
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mode |= 0111;
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access = generic_file_map_access( access );
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/* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
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fd = open_fd( name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
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if (!fd) goto done;
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if (S_ISDIR(mode))
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obj = create_dir_obj( fd );
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else if (S_ISCHR(mode) && is_serial_fd( fd ))
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obj = create_serial( fd, options );
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else
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obj = create_file_obj( fd, access, options );
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release_object( fd );
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done:
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free( name );
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return obj;
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}
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/* check if two file objects point to the same file */
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int is_same_file( struct file *file1, struct file *file2 )
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{
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return is_same_file_fd( file1->fd, file2->fd );
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}
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/* create a temp file for anonymous mappings */
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struct file *create_temp_file( int access )
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{
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char tmpfn[16];
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int fd;
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sprintf( tmpfn, "anonmap.XXXXXX" ); /* create it in the server directory */
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fd = mkstemps( tmpfn, 0 );
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if (fd == -1)
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{
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file_set_error();
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return NULL;
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}
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unlink( tmpfn );
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return create_file_for_fd( fd, access, 0 );
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}
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static void file_dump( struct object *obj, int verbose )
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{
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struct file *file = (struct file *)obj;
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assert( obj->ops == &file_ops );
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fprintf( stderr, "File fd=%p options=%08x\n", file->fd, file->options );
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}
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static int file_get_poll_events( struct fd *fd )
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{
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struct file *file = get_fd_user( fd );
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int events = 0;
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assert( file->obj.ops == &file_ops );
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if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
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if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
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return events;
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}
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static void file_flush( struct fd *fd, struct event **event )
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{
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int unix_fd = get_unix_fd( fd );
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if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
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}
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static enum server_fd_type file_get_info( struct fd *fd, int *flags )
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{
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struct file *file = get_fd_user( fd );
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*flags = 0;
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if (is_overlapped( file )) *flags |= FD_FLAG_OVERLAPPED;
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return FD_TYPE_FILE;
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}
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static struct fd *file_get_fd( struct object *obj )
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{
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struct file *file = (struct file *)obj;
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assert( obj->ops == &file_ops );
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return (struct fd *)grab_object( file->fd );
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}
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static unsigned int generic_file_map_access( unsigned int access )
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{
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if (access & GENERIC_READ) access |= FILE_GENERIC_READ;
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if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE;
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if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
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if (access & GENERIC_ALL) access |= FILE_ALL_ACCESS;
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return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
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}
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static unsigned int file_map_access( struct object *obj, unsigned int access )
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{
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return generic_file_map_access( access );
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}
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static void file_destroy( struct object *obj )
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{
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struct file *file = (struct file *)obj;
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assert( obj->ops == &file_ops );
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if (file->fd) release_object( file->fd );
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}
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/* set the last error depending on errno */
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void file_set_error(void)
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{
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switch (errno)
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{
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case EAGAIN: set_error( STATUS_SHARING_VIOLATION ); break;
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case EBADF: set_error( STATUS_INVALID_HANDLE ); break;
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case ENOSPC: set_error( STATUS_DISK_FULL ); break;
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case EACCES:
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case ESRCH:
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case EPERM: set_error( STATUS_ACCESS_DENIED ); break;
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case EROFS: set_error( STATUS_MEDIA_WRITE_PROTECTED ); break;
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case EBUSY: set_error( STATUS_FILE_LOCK_CONFLICT ); break;
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case ENOENT: set_error( STATUS_NO_SUCH_FILE ); break;
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case EISDIR: set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
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case ENFILE:
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case EMFILE: set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
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case EEXIST: set_error( STATUS_OBJECT_NAME_COLLISION ); break;
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case EINVAL: set_error( STATUS_INVALID_PARAMETER ); break;
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case ESPIPE: set_error( STATUS_ILLEGAL_FUNCTION ); break;
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case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
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case EIO: set_error( STATUS_ACCESS_VIOLATION ); break;
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case ENOTDIR: set_error( STATUS_NOT_A_DIRECTORY ); break;
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case EFBIG: set_error( STATUS_SECTION_TOO_BIG ); break;
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case ENODEV: set_error( STATUS_NO_SUCH_DEVICE ); break;
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case ENXIO: set_error( STATUS_NO_SUCH_DEVICE ); break;
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#ifdef EOVERFLOW
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case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
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#endif
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default: perror("file_set_error"); set_error( STATUS_UNSUCCESSFUL ); break;
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}
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}
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struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
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{
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return (struct file *)get_handle_obj( process, handle, access, &file_ops );
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}
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int get_file_unix_fd( struct file *file )
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{
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return get_unix_fd( file->fd );
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}
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struct file *grab_file_unless_removable( struct file *file )
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{
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if (is_fd_removable( file->fd )) return NULL;
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return (struct file *)grab_object( file );
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}
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/* extend a file beyond the current end of file */
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static int extend_file( struct file *file, file_pos_t new_size )
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{
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static const char zero;
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int unix_fd = get_file_unix_fd( file );
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off_t size = new_size;
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if (unix_fd == -1) return 0;
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if (sizeof(new_size) > sizeof(size) && size != new_size)
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{
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set_error( STATUS_INVALID_PARAMETER );
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return 0;
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}
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/* extend the file one byte beyond the requested size and then truncate it */
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/* this should work around ftruncate implementations that can't extend files */
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if (pwrite( unix_fd, &zero, 1, size ) != -1)
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{
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ftruncate( unix_fd, size );
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return 1;
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}
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file_set_error();
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return 0;
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}
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/* try to grow the file to the specified size */
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int grow_file( struct file *file, file_pos_t size )
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{
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struct stat st;
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int unix_fd = get_file_unix_fd( file );
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if (unix_fd == -1) return 0;
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if (fstat( unix_fd, &st ) == -1)
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{
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file_set_error();
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return 0;
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}
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if (st.st_size >= size) return 1; /* already large enough */
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return extend_file( file, size );
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}
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/* create a file */
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DECL_HANDLER(create_file)
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{
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struct object *file;
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reply->handle = 0;
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if ((file = create_file( get_req_data(), get_req_data_size(), req->access,
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req->sharing, req->create, req->options, req->attrs )))
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{
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reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
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release_object( file );
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}
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}
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/* allocate a file handle for a Unix fd */
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DECL_HANDLER(alloc_file_handle)
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{
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struct file *file;
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int fd;
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reply->handle = 0;
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if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
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{
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set_error( STATUS_INVALID_HANDLE );
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return;
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}
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if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
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{
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reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
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release_object( file );
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}
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}
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/* lock a region of a file */
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DECL_HANDLER(lock_file)
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{
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struct file *file;
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file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
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file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;
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if ((file = get_file_obj( current->process, req->handle, 0 )))
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{
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reply->handle = lock_fd( file->fd, offset, count, req->shared, req->wait );
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reply->overlapped = is_overlapped( file );
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release_object( file );
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}
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}
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/* unlock a region of a file */
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DECL_HANDLER(unlock_file)
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{
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struct file *file;
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file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
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file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;
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if ((file = get_file_obj( current->process, req->handle, 0 )))
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{
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unlock_fd( file->fd, offset, count );
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release_object( file );
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}
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}
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