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wine/server/file.c
Alexandre Julliard 5bc78089db Made server communication faster by using a shared memory block. 
A few other optimizations in request processing in the server.
Moved automatically generated request definitions to server.h and
removed include/server/request.h.
1999-06-22 17:26:53 +00:00

617 lines
17 KiB
C
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/*
* Server-side file management
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.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 "winbase.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
struct file
{
struct object obj; /* object header */
struct select_user select; /* select user */
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 */
};
#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 =
{
sizeof(struct file),
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 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)) 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( ERROR_SHARING_VIOLATION );
return 0;
}
static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing,
unsigned int attrs )
{
struct file *file;
if ((file = alloc_object( &file_ops )))
{
file->name = NULL;
file->next = NULL;
file->select.fd = fd;
file->select.func = default_select_event;
file->select.private = file;
file->access = access;
file->flags = attrs;
file->sharing = sharing;
register_select_user( &file->select );
}
return file;
}
static struct file *create_file( const char *nameptr, size_t len, unsigned int access,
unsigned int sharing, int create, unsigned int attrs )
{
struct file *file;
int hash, flags;
struct stat st;
char *name;
int fd = -1;
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( ERROR_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;
}
/* FIXME: should set error to ERROR_ALREADY_EXISTS if file existed before */
if ((fd = open( name, flags | O_NONBLOCK,
(attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666 )) == -1)
goto file_error;
/* refuse to open a directory */
if (fstat( fd, &st ) == -1) goto file_error;
if (S_ISDIR(st.st_mode))
{
set_error( ERROR_ACCESS_DENIED );
goto error;
}
if (!(file = create_file_for_fd( fd, access, sharing, attrs ))) goto error;
file->name = name;
file->next = file_hash[hash];
file_hash[hash] = file;
return file;
file_error:
file_set_error();
error:
if (fd != -1) close( fd );
free( name );
return NULL;
}
/* Create an anonymous Unix file */
int create_anonymous_file(void)
{
char *name;
int fd;
do
{
if (!(name = tmpnam(NULL)))
{
set_error( ERROR_TOO_MANY_OPEN_FILES );
return -1;
}
fd = open( name, O_CREAT | O_EXCL | O_RDWR, 0600 );
} while ((fd == -1) && (errno == EEXIST));
if (fd == -1)
{
file_set_error();
return -1;
}
unlink( name );
return fd;
}
/* Create a temp file for anonymous mappings */
struct file *create_temp_file( int access )
{
struct file *file;
int fd;
if ((fd = create_anonymous_file()) != -1) return NULL;
if (!(file = create_file_for_fd( fd, access, 0, 0 ))) close( fd );
return file;
}
static void file_dump( struct object *obj, int verbose )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
fprintf( stderr, "File fd=%d flags=%08x name='%s'\n",
file->select.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 */
{
int events = 0;
if (file->access & GENERIC_READ) events |= READ_EVENT;
if (file->access & GENERIC_WRITE) events |= WRITE_EVENT;
set_select_events( &file->select, events );
}
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 */
set_select_events( &file->select, 0 );
release_object( obj );
}
static int file_signaled( struct object *obj, struct thread *thread )
{
int events = 0;
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
if (file->access & GENERIC_READ) events |= READ_EVENT;
if (file->access & GENERIC_WRITE) events |= WRITE_EVENT;
if (check_select_events( &file->select, events ))
{
/* stop waiting on select() if we are signaled */
set_select_events( &file->select, 0 );
return 1;
}
else
{
/* restart waiting on select() if we are no longer signaled */
if (obj->head) set_select_events( &file->select, events );
return 0;
}
}
static int file_get_read_fd( struct object *obj )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
return dup( file->select.fd );
}
static int file_get_write_fd( struct object *obj )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
return dup( file->select.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->select.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->select.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->select.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;
if (file->flags & FILE_FLAG_DELETE_ON_CLOSE) unlink( file->name );
free( file->name );
}
unregister_select_user( &file->select );
close( file->select.fd );
}
/* 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->select.fd );
}
static 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->select.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;
}
static 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->select.fd, 0, SEEK_CUR )) == -1) ||
(ftruncate( file->select.fd, result ) == -1))
{
file_set_error();
release_object( file );
return 0;
}
release_object( file );
return 1;
}
/* try to grow the file to the specified size */
int grow_file( struct file *file, int size_high, int size_low )
{
struct stat st;
if (size_high)
{
set_error( ERROR_INVALID_PARAMETER );
return 0;
}
if (fstat( file->select.fd, &st ) == -1)
{
file_set_error();
return 0;
}
if (st.st_size >= size_low) return 1; /* already large enough */
if (ftruncate( file->select.fd, size_low ) != -1) return 1;
file_set_error();
return 0;
}
static 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;
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;
}
static int file_lock( struct file *file, int offset_high, int offset_low,
int count_high, int count_low )
{
/* FIXME: implement this */
return 1;
}
static int file_unlock( struct file *file, int offset_high, int offset_low,
int count_high, int count_low )
{
/* FIXME: implement this */
return 1;
}
/* create a file */
DECL_HANDLER(create_file)
{
struct create_file_reply *reply = push_reply_data( current, sizeof(*reply) );
struct file *file = NULL;
if (fd == -1)
{
size_t len = get_req_strlen();
file = create_file( get_req_data( len + 1), len, req->access,
req->sharing, req->create, req->attrs );
}
else
{
if ((fd = dup(fd)) == -1)
file_set_error();
else
file = create_file_for_fd( fd, req->access, req->sharing, req->attrs );
}
if (file)
{
reply->handle = alloc_handle( current->process, file, req->access, req->inherit );
release_object( file );
}
else reply->handle = -1;
}
/* get a Unix fd to read from a file */
DECL_HANDLER(get_read_fd)
{
struct object *obj;
int read_fd;
if ((obj = get_handle_obj( current->process, req->handle, GENERIC_READ, NULL )))
{
read_fd = obj->ops->get_read_fd( obj );
release_object( obj );
}
else read_fd = -1;
set_reply_fd( current, read_fd );
}
/* get a Unix fd to write to a file */
DECL_HANDLER(get_write_fd)
{
struct object *obj;
int write_fd;
if ((obj = get_handle_obj( current->process, req->handle, GENERIC_WRITE, NULL )))
{
write_fd = obj->ops->get_write_fd( obj );
release_object( obj );
}
else write_fd = -1;
set_reply_fd( current, write_fd );
}
/* set a file current position */
DECL_HANDLER(set_file_pointer)
{
struct set_file_pointer_reply reply;
reply.low = req->low;
reply.high = req->high;
set_file_pointer( req->handle, &reply.low, &reply.high, req->whence );
add_reply_data( current, &reply, sizeof(reply) );
}
/* truncate (or extend) a file */
DECL_HANDLER(truncate_file)
{
truncate_file( req->handle );
}
/* flush a file buffers */
DECL_HANDLER(flush_file)
{
struct object *obj;
if ((obj = get_handle_obj( current->process, req->handle, GENERIC_WRITE, NULL )))
{
obj->ops->flush( obj );
release_object( obj );
}
}
/* set a file access and modification times */
DECL_HANDLER(set_file_time)
{
set_file_time( req->handle, req->access_time, req->write_time );
}
/* get a file information */
DECL_HANDLER(get_file_info)
{
struct object *obj;
struct get_file_info_reply *reply = push_reply_data( current, sizeof(*reply) );
if ((obj = get_handle_obj( current->process, req->handle, 0, NULL )))
{
obj->ops->get_file_info( obj, reply );
release_object( obj );
}
}
/* lock a region of a file */
DECL_HANDLER(lock_file)
{
struct file *file;
if ((file = get_file_obj( current->process, req->handle, 0 )))
{
file_lock( file, req->offset_high, req->offset_low,
req->count_high, req->count_low );
release_object( file );
}
}
/* unlock a region of a file */
DECL_HANDLER(unlock_file)
{
struct file *file;
if ((file = get_file_obj( current->process, req->handle, 0 )))
{
file_unlock( file, req->offset_high, req->offset_low,
req->count_high, req->count_low );
release_object( file );
}
}
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