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