567 lines
16 KiB
C
567 lines
16 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 "config.h"
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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 <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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#include <utime.h>
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#include "winerror.h"
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#include "winbase.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 file *next; /* next file in hashing list */
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char *name; /* file name */
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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_get_poll_events( struct object *obj );
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static int file_get_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_request *req );
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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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sizeof(struct file), /* size */
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file_dump, /* dump */
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default_poll_add_queue, /* add_queue */
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default_poll_remove_queue, /* remove_queue */
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default_poll_signaled, /* signaled */
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no_satisfied, /* satisfied */
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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_get_fd, /* get_fd */
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file_flush, /* flush */
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file_get_info, /* get_file_info */
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file_destroy /* destroy */
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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 ^= (unsigned char)*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)) goto error;
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if ((access & GENERIC_WRITE) && !(existing_sharing & FILE_SHARE_WRITE)) goto error;
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if ((existing_access & GENERIC_READ) && !(sharing & FILE_SHARE_READ)) goto error;
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if ((existing_access & GENERIC_WRITE) && !(sharing & FILE_SHARE_WRITE)) goto error;
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return 1;
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error:
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set_error( STATUS_SHARING_VIOLATION );
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return 0;
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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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unsigned int attrs )
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{
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struct file *file;
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if ((file = alloc_object( &file_ops, fd )))
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{
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file->name = NULL;
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file->next = NULL;
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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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}
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return file;
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}
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static struct file *create_file( const char *nameptr, size_t len, 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, flags;
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struct stat st;
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char *name;
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int fd = -1;
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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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/* check sharing mode */
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hash = get_name_hash( name );
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if (!check_sharing( name, hash, access, sharing )) goto error;
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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( STATUS_INVALID_PARAMETER ); goto error;
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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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/* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
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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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goto file_error;
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/* refuse to open a directory */
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if (fstat( fd, &st ) == -1) goto file_error;
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if (S_ISDIR(st.st_mode))
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{
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set_error( STATUS_ACCESS_DENIED );
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goto error;
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}
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if (!(file = create_file_for_fd( fd, access, sharing, attrs )))
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{
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free( name );
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return NULL;
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}
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file->name = name;
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file->next = file_hash[hash];
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file_hash[hash] = file;
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return file;
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file_error:
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file_set_error();
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error:
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if (fd != -1) close( fd );
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free( name );
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return NULL;
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}
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/* Create an anonymous Unix file */
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int create_anonymous_file(void)
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{
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char *name;
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int fd;
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do
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{
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if (!(name = tmpnam(NULL)))
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{
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set_error( STATUS_TOO_MANY_OPENED_FILES );
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return -1;
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}
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fd = open( name, O_CREAT | O_EXCL | O_RDWR, 0600 );
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} while ((fd == -1) && (errno == EEXIST));
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if (fd == -1)
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{
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file_set_error();
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return -1;
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}
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unlink( name );
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return 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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int fd;
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if ((fd = create_anonymous_file()) == -1) return NULL;
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return create_file_for_fd( fd, access, 0, 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=%d flags=%08x name='%s'\n", file->obj.fd, file->flags, file->name );
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}
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static int file_get_poll_events( struct object *obj )
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{
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struct file *file = (struct file *)obj;
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int events = 0;
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assert( obj->ops == &file_ops );
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if (file->access & GENERIC_READ) events |= POLLIN;
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if (file->access & GENERIC_WRITE) events |= POLLOUT;
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return events;
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}
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static int 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 file->obj.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->obj.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_request *req )
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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->obj.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->obj.fd)) req->type = FILE_TYPE_CHAR;
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else req->type = FILE_TYPE_DISK;
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if (S_ISDIR(st.st_mode)) req->attr = FILE_ATTRIBUTE_DIRECTORY;
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else req->attr = FILE_ATTRIBUTE_ARCHIVE;
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if (!(st.st_mode & S_IWUSR)) req->attr |= FILE_ATTRIBUTE_READONLY;
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req->access_time = st.st_atime;
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req->write_time = st.st_mtime;
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req->size_high = 0;
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req->size_low = S_ISDIR(st.st_mode) ? 0 : st.st_size;
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req->links = st.st_nlink;
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req->index_high = st.st_dev;
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req->index_low = st.st_ino;
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req->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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if (file->flags & FILE_FLAG_DELETE_ON_CLOSE) unlink( file->name );
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free( file->name );
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}
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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 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( 0xc0010000 | ERROR_CANNOT_MAKE /* FIXME */ ); break;
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case ENFILE:
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case EMFILE: set_error( STATUS_NO_MORE_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( 0xc0010000 | ERROR_SEEK /* FIXME */ ); 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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default: perror("file_set_error"); set_error( ERROR_UNKNOWN /* FIXME */ ); break;
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}
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}
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struct file *get_file_obj( struct process *process, 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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static int set_file_pointer( handle_t 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 ((*low >= 0 && *high != 0) || (*low < 0 && *high != -1))
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{
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fprintf( stderr, "set_file_pointer: offset > 2Gb not supported yet\n" );
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set_error( STATUS_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->obj.fd, *low, whence )) == -1)
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{
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/* Check for seek before start of file */
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/* also check EPERM due to SuSE7 2.2.16 lseek() EPERM kernel bug */
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if (((errno == EINVAL) || (errno == EPERM))
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&& (whence != SEEK_SET) && (*low < 0))
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set_error( 0xc0010000 | ERROR_NEGATIVE_SEEK /* FIXME */ );
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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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static int truncate_file( handle_t 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->obj.fd, 0, SEEK_CUR )) == -1) ||
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(ftruncate( file->obj.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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/* try to grow the file to the specified size */
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int grow_file( struct file *file, int size_high, int size_low )
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{
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struct stat st;
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if (size_high)
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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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if (fstat( file->obj.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_low) return 1; /* already large enough */
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if (ftruncate( file->obj.fd, size_low ) != -1) return 1;
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file_set_error();
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return 0;
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}
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static int set_file_time( handle_t 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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if (!file->name)
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{
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set_error( STATUS_INVALID_HANDLE );
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release_object( file );
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return 0;
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}
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if (!access_time || !write_time)
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{
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struct stat st;
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if (stat( file->name, &st ) == -1) goto error;
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if (!access_time) access_time = st.st_atime;
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if (!write_time) write_time = st.st_mtime;
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}
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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) goto error;
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release_object( file );
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return 1;
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error:
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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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static int file_lock( struct file *file, int offset_high, int offset_low,
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int count_high, int count_low )
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{
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/* FIXME: implement this */
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return 1;
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}
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static int file_unlock( struct file *file, int offset_high, int offset_low,
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int count_high, int count_low )
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{
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/* FIXME: implement this */
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return 1;
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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 file *file;
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req->handle = 0;
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if ((file = create_file( get_req_data(req), get_req_data_size(req), req->access,
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req->sharing, req->create, req->attrs )))
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{
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req->handle = alloc_handle( current->process, file, req->access, req->inherit );
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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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req->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, 0 )))
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{
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req->handle = alloc_handle( current->process, file, req->access, 0 );
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release_object( file );
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}
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}
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/* get a Unix fd to access a file */
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DECL_HANDLER(get_handle_fd)
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{
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struct object *obj;
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req->fd = -1;
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if ((obj = get_handle_obj( current->process, req->handle, req->access, NULL )))
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{
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int fd = get_handle_fd( current->process, req->handle, req->access );
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if (fd != -1) req->fd = fd;
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else if (!get_error())
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{
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if ((fd = obj->ops->get_fd( obj )) != -1)
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send_client_fd( current->process, fd, req->handle );
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}
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release_object( obj );
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}
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}
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/* set a file current position */
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DECL_HANDLER(set_file_pointer)
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{
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int high = req->high;
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int low = req->low;
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set_file_pointer( req->handle, &low, &high, req->whence );
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req->new_low = low;
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req->new_high = high;
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}
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/* truncate (or extend) a file */
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DECL_HANDLER(truncate_file)
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{
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truncate_file( req->handle );
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}
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/* flush a file buffers */
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DECL_HANDLER(flush_file)
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{
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struct object *obj;
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if ((obj = get_handle_obj( current->process, req->handle, 0, NULL )))
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{
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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;
|
|
|
|
if ((obj = get_handle_obj( current->process, req->handle, 0, NULL )))
|
|
{
|
|
obj->ops->get_file_info( obj, req );
|
|
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 );
|
|
}
|
|
}
|