| /* |
| * 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; |
| |
| } |
