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Sweden-Number/server/file.c

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/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
#include "winerror.h"
#include "windef.h"
#include "winbase.h"
#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
#include "async.h"
struct file
{
struct object obj; /* object header */
struct fd *fd; /* file descriptor for this file */
struct file *next; /* next file in hashing list */
char *name; /* file name */
unsigned int access; /* file access (GENERIC_READ/WRITE) */
unsigned int flags; /* flags (FILE_FLAG_*) */
unsigned int sharing; /* file sharing mode */
int removable; /* is file on removable media? */
struct async_queue read_q;
struct async_queue write_q;
};
#define NAME_HASH_SIZE 37
static struct file *file_hash[NAME_HASH_SIZE];
static void file_dump( struct object *obj, int verbose );
static struct fd *file_get_fd( struct object *obj );
static void file_destroy( struct object *obj );
static int file_get_poll_events( struct fd *fd );
static void file_poll_event( struct fd *fd, int event );
static int file_flush( struct fd *fd, struct event **event );
static int file_get_info( struct fd *fd, struct get_file_info_reply *reply, int *flags );
static void file_queue_async( struct fd *fd, void *ptr, unsigned int status, int type, int count );
static const struct object_ops file_ops =
{
sizeof(struct file), /* size */
file_dump, /* dump */
default_fd_add_queue, /* add_queue */
default_fd_remove_queue, /* remove_queue */
default_fd_signaled, /* signaled */
no_satisfied, /* satisfied */
file_get_fd, /* get_fd */
file_destroy /* destroy */
};
static const struct fd_ops file_fd_ops =
{
file_get_poll_events, /* get_poll_events */
file_poll_event, /* poll_event */
file_flush, /* flush */
file_get_info, /* get_file_info */
file_queue_async /* queue_async */
};
static int get_name_hash( const char *name )
{
int hash = 0;
while (*name) hash ^= (unsigned char)*name++;
return hash % NAME_HASH_SIZE;
}
/* check if the desired access is possible without violating */
/* the sharing mode of other opens of the same file */
static int check_sharing( const char *name, int hash, unsigned int access,
unsigned int sharing )
{
struct file *file;
unsigned int existing_sharing = FILE_SHARE_READ | FILE_SHARE_WRITE;
unsigned int existing_access = 0;
for (file = file_hash[hash]; file; file = file->next)
{
if (strcmp( file->name, name )) continue;
existing_sharing &= file->sharing;
existing_access |= file->access;
}
if ((access & GENERIC_READ) && !(existing_sharing & FILE_SHARE_READ)) goto error;
if ((access & GENERIC_WRITE) && !(existing_sharing & FILE_SHARE_WRITE)) goto error;
if ((existing_access & GENERIC_READ) && !(sharing & FILE_SHARE_READ)) goto error;
if ((existing_access & GENERIC_WRITE) && !(sharing & FILE_SHARE_WRITE)) goto error;
return 1;
error:
set_error( STATUS_SHARING_VIOLATION );
return 0;
}
/* 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,
unsigned int attrs, int removable )
{
struct file *file;
if ((file = alloc_object( &file_ops )))
{
file->name = NULL;
file->next = NULL;
file->access = access;
file->flags = attrs;
file->sharing = sharing;
file->removable = removable;
if (file->flags & FILE_FLAG_OVERLAPPED)
{
init_async_queue (&file->read_q);
init_async_queue (&file->write_q);
}
if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj )))
{
release_object( file );
return NULL;
}
}
return file;
}
static struct file *create_file( const char *nameptr, size_t len, unsigned int access,
unsigned int sharing, int create, unsigned int attrs,
int removable )
{
struct file *file;
int hash, flags;
char *name;
mode_t mode;
if (!(name = mem_alloc( len + 1 ))) return NULL;
memcpy( name, nameptr, len );
name[len] = 0;
/* check sharing mode */
hash = get_name_hash( name );
if (!check_sharing( name, hash, access, sharing )) goto error;
switch(create)
{
case CREATE_NEW: flags = O_CREAT | O_EXCL; break;
case CREATE_ALWAYS: flags = O_CREAT | O_TRUNC; break;
case OPEN_ALWAYS: flags = O_CREAT; break;
case TRUNCATE_EXISTING: flags = O_TRUNC; break;
case OPEN_EXISTING: flags = 0; break;
default: set_error( STATUS_INVALID_PARAMETER ); goto error;
}
switch(access & (GENERIC_READ | GENERIC_WRITE))
{
case 0: break;
case GENERIC_READ: flags |= O_RDONLY; break;
case GENERIC_WRITE: flags |= O_WRONLY; break;
case GENERIC_READ|GENERIC_WRITE: flags |= O_RDWR; break;
}
mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
if (len >= 4 &&
(!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
mode |= 0111;
if (!(file = alloc_object( &file_ops ))) goto error;
file->access = access;
file->flags = attrs;
file->sharing = sharing;
file->removable = removable;
file->name = name;
file->next = file_hash[hash];
file_hash[hash] = file;
if (file->flags & FILE_FLAG_OVERLAPPED)
{
init_async_queue (&file->read_q);
init_async_queue (&file->write_q);
}
/* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
if (!(file->fd = alloc_fd( &file_fd_ops, &file->obj )) ||
!(file->fd = open_fd( file->fd, name, flags | O_NONBLOCK | O_LARGEFILE, &mode )))
{
release_object( file );
return NULL;
}
/* refuse to open a directory */
if (S_ISDIR(mode) && !(file->flags & FILE_FLAG_BACKUP_SEMANTICS))
{
set_error( STATUS_ACCESS_DENIED );
release_object( file );
return NULL;
}
return file;
error:
free( name );
return NULL;
}
/* check if two file objects point to the same file */
int is_same_file( struct file *file1, struct file *file2 )
{
return !strcmp( file1->name, file2->name );
}
/* check if the file is on removable media */
int is_file_removable( struct file *file )
{
return file->removable;
}
/* 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, 0, FALSE );
}
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 flags=%08x name='%s'\n", file->fd, file->flags, file->name );
}
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 & GENERIC_READ) events |= POLLIN;
if (file->access & GENERIC_WRITE) events |= POLLOUT;
return events;
}
static void file_poll_event( struct fd *fd, int event )
{
struct file *file = get_fd_user( fd );
assert( file->obj.ops == &file_ops );
if ( file->flags & FILE_FLAG_OVERLAPPED )
{
if( IS_READY(file->read_q) && (POLLIN & event) )
{
async_notify(file->read_q.head, STATUS_ALERTED);
return;
}
if( IS_READY(file->write_q) && (POLLOUT & event) )
{
async_notify(file->write_q.head, STATUS_ALERTED);
return;
}
}
default_poll_event( fd, event );
}
static int file_flush( struct fd *fd, struct event **event )
{
int ret = (fsync( get_unix_fd(fd) ) != -1);
if (!ret) file_set_error();
return ret;
}
static int file_get_info( struct fd *fd, struct get_file_info_reply *reply, int *flags )
{
struct stat st;
struct file *file = get_fd_user( fd );
int unix_fd = get_unix_fd( fd );
if (reply)
{
if (fstat( unix_fd, &st ) == -1)
{
file_set_error();
return FD_TYPE_INVALID;
}
if (S_ISCHR(st.st_mode) || S_ISFIFO(st.st_mode) ||
S_ISSOCK(st.st_mode) || isatty(unix_fd)) reply->type = FILE_TYPE_CHAR;
else reply->type = FILE_TYPE_DISK;
if (S_ISDIR(st.st_mode)) reply->attr = FILE_ATTRIBUTE_DIRECTORY;
else reply->attr = FILE_ATTRIBUTE_ARCHIVE;
if (!(st.st_mode & S_IWUSR)) reply->attr |= FILE_ATTRIBUTE_READONLY;
reply->access_time = st.st_atime;
reply->write_time = st.st_mtime;
reply->change_time = st.st_ctime;
if (S_ISDIR(st.st_mode))
{
reply->size_high = 0;
reply->size_low = 0;
reply->alloc_high = 0;
reply->alloc_low = 0;
}
else
{
file_pos_t alloc;
reply->size_high = st.st_size >> 32;
reply->size_low = st.st_size & 0xffffffff;
alloc = (file_pos_t)st.st_blksize * st.st_blocks;
reply->alloc_high = alloc >> 32;
reply->alloc_low = alloc & 0xffffffff;
}
reply->links = st.st_nlink;
reply->index_high = st.st_dev;
reply->index_low = st.st_ino;
reply->serial = 0; /* FIXME */
}
*flags = 0;
if (file->flags & FILE_FLAG_OVERLAPPED) *flags |= FD_FLAG_OVERLAPPED;
return FD_TYPE_DEFAULT;
}
static void file_queue_async(struct fd *fd, void *ptr, unsigned int status, int type, int count)
{
struct file *file = get_fd_user( fd );
struct async *async;
struct async_queue *q;
assert( file->obj.ops == &file_ops );
if ( !(file->flags & FILE_FLAG_OVERLAPPED) )
{
set_error ( STATUS_INVALID_HANDLE );
return;
}
switch(type)
{
case ASYNC_TYPE_READ:
q = &file->read_q;
break;
case ASYNC_TYPE_WRITE:
q = &file->write_q;
break;
default:
set_error( STATUS_INVALID_PARAMETER );
return;
}
async = find_async ( q, current, ptr );
if ( status == STATUS_PENDING )
{
int events;
if ( !async )
async = create_async ( &file->obj, current, ptr );
if ( !async )
return;
async->status = STATUS_PENDING;
if ( !async->q )
async_insert( q, async );
/* Check if the new pending request can be served immediately */
events = check_fd_events( fd, file_get_poll_events( fd ) );
if (events) file_poll_event ( fd, events );
}
else if ( async ) destroy_async ( async );
else set_error ( STATUS_INVALID_PARAMETER );
set_fd_events( fd, file_get_poll_events( fd ));
}
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 void file_destroy( struct object *obj )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
if (file->name)
{
/* remove it from the hashing list */
struct file **pptr = &file_hash[get_name_hash( file->name )];
while (*pptr && *pptr != file) pptr = &(*pptr)->next;
assert( *pptr );
*pptr = (*pptr)->next;
if (file->flags & FILE_FLAG_DELETE_ON_CLOSE) unlink( file->name );
free( file->name );
}
if (file->flags & FILE_FLAG_OVERLAPPED)
{
destroy_async_queue (&file->read_q);
destroy_async_queue (&file->write_q);
}
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_win32_error( ERROR_CANNOT_MAKE ); break;
case ENFILE:
case EMFILE: set_error( STATUS_NO_MORE_FILES ); break;
case EEXIST: set_error( STATUS_OBJECT_NAME_COLLISION ); break;
case EINVAL: set_error( STATUS_INVALID_PARAMETER ); break;
case ESPIPE: set_win32_error( ERROR_SEEK ); break;
case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
case EIO: set_error( STATUS_ACCESS_VIOLATION ); break;
#ifdef EOVERFLOW
case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
#endif
default: perror("file_set_error"); set_win32_error( ERROR_UNKNOWN ); 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 );
}
static int set_file_pointer( obj_handle_t handle, unsigned int *low, int *high, int whence )
{
struct file *file;
off_t result,xto;
xto = *low+((off_t)*high<<32);
if (!(file = get_file_obj( current->process, handle, 0 )))
return 0;
if ((result = lseek( get_file_unix_fd(file), xto, whence))==-1)
{
/* Check for seek before start of file */
/* also check EPERM due to SuSE7 2.2.16 lseek() EPERM kernel bug */
if (((errno == EINVAL) || (errno == EPERM))
&& (whence != SEEK_SET) && (*high < 0))
set_win32_error( ERROR_NEGATIVE_SEEK );
else
file_set_error();
release_object( file );
return 0;
}
*low = result & 0xffffffff;
*high = result >> 32;
release_object( file );
return 1;
}
/* extend a file beyond the current end of file */
static int extend_file( struct file *file, off_t size )
{
static const char zero;
int unix_fd = get_file_unix_fd( file );
/* 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 ((lseek( unix_fd, size, SEEK_SET ) != -1) &&
(write( unix_fd, &zero, 1 ) != -1))
{
ftruncate( unix_fd, size );
return 1;
}
file_set_error();
return 0;
}
/* truncate file at current position */
static int truncate_file( struct file *file )
{
int ret = 0;
int unix_fd = get_file_unix_fd( file );
off_t pos = lseek( unix_fd, 0, SEEK_CUR );
off_t eof = lseek( unix_fd, 0, SEEK_END );
if (eof < pos) ret = extend_file( file, pos );
else
{
if (ftruncate( unix_fd, pos ) != -1) ret = 1;
else file_set_error();
}
lseek( unix_fd, pos, SEEK_SET ); /* restore file pos */
return ret;
}
/* try to grow the file to the specified size */
int grow_file( struct file *file, int size_high, int size_low )
{
int ret = 0;
struct stat st;
int unix_fd = get_file_unix_fd( file );
off_t old_pos, size = size_low + (((off_t)size_high)<<32);
if (fstat( unix_fd, &st ) == -1)
{
file_set_error();
return 0;
}
if (st.st_size >= size) return 1; /* already large enough */
old_pos = lseek( unix_fd, 0, SEEK_CUR ); /* save old pos */
ret = extend_file( file, size );
lseek( unix_fd, old_pos, SEEK_SET ); /* restore file pos */
return ret;
}
static int set_file_time( obj_handle_t handle, time_t access_time, time_t write_time )
{
struct file *file;
struct utimbuf utimbuf;
if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
return 0;
if (!file->name)
{
set_error( STATUS_INVALID_HANDLE );
release_object( file );
return 0;
}
if (!access_time || !write_time)
{
struct stat st;
if (stat( file->name, &st ) == -1) goto error;
if (!access_time) access_time = st.st_atime;
if (!write_time) write_time = st.st_mtime;
}
utimbuf.actime = access_time;
utimbuf.modtime = write_time;
if (utime( file->name, &utimbuf ) == -1) goto error;
release_object( file );
return 1;
error:
file_set_error();
release_object( file );
return 0;
}
/* create a file */
DECL_HANDLER(create_file)
{
struct file *file;
reply->handle = 0;
if ((file = create_file( get_req_data(), get_req_data_size(), req->access,
req->sharing, req->create, req->attrs, req->removable )))
{
reply->handle = alloc_handle( current->process, file, req->access, req->inherit );
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,
0, FALSE )))
{
reply->handle = alloc_handle( current->process, file, req->access, req->inherit );
release_object( file );
}
}
/* set a file current position */
DECL_HANDLER(set_file_pointer)
{
int high = req->high;
int low = req->low;
set_file_pointer( req->handle, &low, &high, req->whence );
reply->new_low = low;
reply->new_high = high;
}
/* truncate (or extend) a file */
DECL_HANDLER(truncate_file)
{
struct file *file;
if ((file = get_file_obj( current->process, req->handle, GENERIC_WRITE )))
{
truncate_file( file );
release_object( file );
}
}
/* set a file access and modification times */
DECL_HANDLER(set_file_time)
{
set_file_time( req->handle, req->access_time, req->write_time );
}
/* 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 = (file->flags & FILE_FLAG_OVERLAPPED) != 0;
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 );
}
}
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