Sweden-Number/server/file.c

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/*
* Server-side file management
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <utime.h>
#include "winerror.h"
#include "winnt.h"
#include "server/thread.h"
struct file
{
struct object obj; /* object header */
struct file *next; /* next file in hashing list */
char *name; /* file name */
int fd; /* Unix file descriptor */
unsigned int access; /* file access (GENERIC_READ/WRITE) */
unsigned int flags; /* flags (FILE_FLAG_*) */
unsigned int sharing; /* file sharing mode */
};
#define NAME_HASH_SIZE 37
static struct file *file_hash[NAME_HASH_SIZE];
static void file_dump( struct object *obj, int verbose );
static int file_add_queue( struct object *obj, struct wait_queue_entry *entry );
static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry );
static int file_signaled( struct object *obj, struct thread *thread );
static int file_get_read_fd( struct object *obj );
static int file_get_write_fd( struct object *obj );
static int file_flush( struct object *obj );
static int file_get_info( struct object *obj, struct get_file_info_reply *reply );
static void file_destroy( struct object *obj );
static const struct object_ops file_ops =
{
file_dump,
file_add_queue,
file_remove_queue,
file_signaled,
no_satisfied,
file_get_read_fd,
file_get_write_fd,
file_flush,
file_get_info,
file_destroy
};
static const struct select_ops select_ops =
{
default_select_event,
NULL /* we never set a timeout on a file */
};
static int get_name_hash( const char *name )
{
int hash = 0;
while (*name) hash ^= *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)) return 0;
if ((access & GENERIC_WRITE) && !(existing_sharing & FILE_SHARE_WRITE)) return 0;
if ((existing_access & GENERIC_READ) && !(sharing & FILE_SHARE_READ)) return 0;
if ((existing_access & GENERIC_WRITE) && !(sharing & FILE_SHARE_WRITE)) return 0;
return 1;
}
struct object *create_file( int fd, const char *name, unsigned int access,
unsigned int sharing, int create, unsigned int attrs )
{
struct file *file;
int hash = 0;
if (fd == -1)
{
int flags;
struct stat st;
if (!name)
{
SET_ERROR( ERROR_INVALID_PARAMETER );
return NULL;
}
/* check sharing mode */
hash = get_name_hash( name );
if (!check_sharing( name, hash, access, sharing ))
{
SET_ERROR( ERROR_SHARING_VIOLATION );
return NULL;
}
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( ERROR_INVALID_PARAMETER ); return NULL;
}
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;
}
if ((fd = open( name, flags | O_NONBLOCK,
(attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666 )) == -1)
{
file_set_error();
return NULL;
}
/* Refuse to open a directory */
if (fstat( fd, &st ) == -1)
{
file_set_error();
close( fd );
return NULL;
}
if (S_ISDIR(st.st_mode))
{
SET_ERROR( ERROR_ACCESS_DENIED );
close( fd );
return NULL;
}
}
else
{
if ((fd = dup(fd)) == -1)
{
file_set_error();
return NULL;
}
}
if (!(file = mem_alloc( sizeof(*file) )))
{
close( fd );
return NULL;
}
if (name)
{
if (!(file->name = mem_alloc( strlen(name) + 1 )))
{
close( fd );
free( file );
return NULL;
}
strcpy( file->name, name );
file->next = file_hash[hash];
file_hash[hash] = file;
}
else
{
file->name = NULL;
file->next = NULL;
}
init_object( &file->obj, &file_ops, NULL );
file->fd = fd;
file->access = access;
file->flags = attrs;
file->sharing = sharing;
CLEAR_ERROR();
return &file->obj;
}
static void file_dump( struct object *obj, int verbose )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
printf( "File fd=%d flags=%08x name='%s'\n",
file->fd, file->flags, file->name );
}
static int file_add_queue( struct object *obj, struct wait_queue_entry *entry )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
if (!obj->head) /* first on the queue */
{
if (!add_select_user( file->fd, READ_EVENT | WRITE_EVENT, &select_ops, file ))
{
SET_ERROR( ERROR_OUTOFMEMORY );
return 0;
}
}
add_queue( obj, entry );
return 1;
}
static void file_remove_queue( struct object *obj, struct wait_queue_entry *entry )
{
struct file *file = (struct file *)grab_object(obj);
assert( obj->ops == &file_ops );
remove_queue( obj, entry );
if (!obj->head) /* last on the queue is gone */
remove_select_user( file->fd );
release_object( obj );
}
static int file_signaled( struct object *obj, struct thread *thread )
{
fd_set read_fds, write_fds;
struct timeval tv = { 0, 0 };
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
FD_ZERO( &read_fds );
FD_ZERO( &write_fds );
if (file->access & GENERIC_READ) FD_SET( file->fd, &read_fds );
if (file->access & GENERIC_WRITE) FD_SET( file->fd, &write_fds );
return select( file->fd + 1, &read_fds, &write_fds, NULL, &tv ) > 0;
}
static int file_get_read_fd( struct object *obj )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
return dup( file->fd );
}
static int file_get_write_fd( struct object *obj )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
return dup( file->fd );
}
static int file_flush( struct object *obj )
{
int ret;
struct file *file = (struct file *)grab_object(obj);
assert( obj->ops == &file_ops );
ret = (fsync( file->fd ) != -1);
if (!ret) file_set_error();
release_object( file );
return ret;
}
static int file_get_info( struct object *obj, struct get_file_info_reply *reply )
{
struct stat st;
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
if (fstat( file->fd, &st ) == -1)
{
file_set_error();
return 0;
}
if (S_ISCHR(st.st_mode) || S_ISFIFO(st.st_mode) ||
S_ISSOCK(st.st_mode) || isatty(file->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->size_high = 0;
reply->size_low = S_ISDIR(st.st_mode) ? 0 : st.st_size;
reply->links = st.st_nlink;
reply->index_high = st.st_dev;
reply->index_low = st.st_ino;
reply->serial = 0; /* FIXME */
return 1;
}
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;
free( file->name );
}
close( file->fd );
free( file );
}
/* set the last error depending on errno */
void file_set_error(void)
{
switch (errno)
{
case EAGAIN: SET_ERROR( ERROR_SHARING_VIOLATION ); break;
case EBADF: SET_ERROR( ERROR_INVALID_HANDLE ); break;
case ENOSPC: SET_ERROR( ERROR_HANDLE_DISK_FULL ); break;
case EACCES:
case EPERM: SET_ERROR( ERROR_ACCESS_DENIED ); break;
case EROFS: SET_ERROR( ERROR_WRITE_PROTECT ); break;
case EBUSY: SET_ERROR( ERROR_LOCK_VIOLATION ); break;
case ENOENT: SET_ERROR( ERROR_FILE_NOT_FOUND ); break;
case EISDIR: SET_ERROR( ERROR_CANNOT_MAKE ); break;
case ENFILE:
case EMFILE: SET_ERROR( ERROR_NO_MORE_FILES ); break;
case EEXIST: SET_ERROR( ERROR_FILE_EXISTS ); break;
case EINVAL: SET_ERROR( ERROR_INVALID_PARAMETER ); break;
case ESPIPE: SET_ERROR( ERROR_SEEK ); break;
case ENOTEMPTY: SET_ERROR( ERROR_DIR_NOT_EMPTY ); break;
default: perror("file_set_error"); SET_ERROR( ERROR_UNKNOWN ); break;
}
}
struct file *get_file_obj( struct process *process, int handle,
unsigned int access )
{
return (struct file *)get_handle_obj( current->process, handle,
access, &file_ops );
}
int file_get_mmap_fd( struct file *file )
{
return dup( file->fd );
}
int set_file_pointer( int handle, int *low, int *high, int whence )
{
struct file *file;
int result;
if (*high)
{
fprintf( stderr, "set_file_pointer: offset > 4Gb not supported yet\n" );
SET_ERROR( ERROR_INVALID_PARAMETER );
return 0;
}
if (!(file = get_file_obj( current->process, handle, 0 )))
return 0;
if ((result = lseek( file->fd, *low, whence )) == -1)
{
/* Check for seek before start of file */
if ((errno == EINVAL) && (whence != SEEK_SET) && (*low < 0))
SET_ERROR( ERROR_NEGATIVE_SEEK );
else
file_set_error();
release_object( file );
return 0;
}
*low = result;
release_object( file );
return 1;
}
int truncate_file( int handle )
{
struct file *file;
int result;
if (!(file = get_file_obj( current->process, handle, GENERIC_WRITE )))
return 0;
if (((result = lseek( file->fd, 0, SEEK_CUR )) == -1) ||
(ftruncate( file->fd, result ) == -1))
{
file_set_error();
release_object( file );
return 0;
}
release_object( file );
return 1;
}
int set_file_time( int 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;
utimbuf.actime = access_time;
utimbuf.modtime = write_time;
if (utime( file->name, &utimbuf ) == -1)
{
file_set_error();
release_object( file );
return 0;
}
release_object( file );
return 1;
}
int file_lock( struct file *file, int offset_high, int offset_low,
int count_high, int count_low )
{
/* FIXME: implement this */
return 1;
}
int file_unlock( struct file *file, int offset_high, int offset_low,
int count_high, int count_low )
{
/* FIXME: implement this */
return 1;
}