/* * Server-side file management * * Copyright (C) 1998 Alexandre Julliard * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ #include "config.h" #include "wine/port.h" #include <assert.h> #include <fcntl.h> #include <stdarg.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <errno.h> #ifdef HAVE_SYS_ERRNO_H #include <sys/errno.h> #endif #include <sys/stat.h> #include <sys/time.h> #include <sys/types.h> #include <time.h> #include <unistd.h> #ifdef HAVE_UTIME_H #include <utime.h> #endif #ifdef HAVE_POLL_H #include <poll.h> #endif #include "ntstatus.h" #define WIN32_NO_STATUS #include "windef.h" #include "winternl.h" #include "file.h" #include "handle.h" #include "thread.h" #include "request.h" #include "process.h" #include "security.h" struct file { struct object obj; /* object header */ struct fd *fd; /* file descriptor for this file */ unsigned int access; /* file access (FILE_READ_DATA etc.) */ mode_t mode; /* file stat.st_mode */ uid_t uid; /* file stat.st_uid */ }; static unsigned int generic_file_map_access( unsigned int access ); static void file_dump( struct object *obj, int verbose ); static struct fd *file_get_fd( struct object *obj ); static struct security_descriptor *file_get_sd( struct object *obj ); static int file_set_sd( struct object *obj, const struct security_descriptor *sd, unsigned int set_info ); static void file_destroy( struct object *obj ); static int file_get_poll_events( struct fd *fd ); static void file_flush( struct fd *fd, struct event **event ); static enum server_fd_type file_get_fd_type( struct fd *fd ); static const struct object_ops file_ops = { sizeof(struct file), /* size */ file_dump, /* dump */ no_get_type, /* get_type */ add_queue, /* add_queue */ remove_queue, /* remove_queue */ default_fd_signaled, /* signaled */ no_satisfied, /* satisfied */ no_signal, /* signal */ file_get_fd, /* get_fd */ default_fd_map_access, /* map_access */ file_get_sd, /* get_sd */ file_set_sd, /* set_sd */ no_lookup_name, /* lookup_name */ no_open_file, /* open_file */ fd_close_handle, /* close_handle */ file_destroy /* destroy */ }; static const struct fd_ops file_fd_ops = { file_get_poll_events, /* get_poll_events */ default_poll_event, /* poll_event */ file_flush, /* flush */ file_get_fd_type, /* get_fd_type */ default_fd_ioctl, /* ioctl */ default_fd_queue_async, /* queue_async */ default_fd_reselect_async, /* reselect_async */ default_fd_cancel_async /* cancel_async */ }; static inline int is_overlapped( const struct file *file ) { return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT)); } /* create a file from a file descriptor */ /* if the function fails the fd is closed */ static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing ) { struct file *file; struct stat st; if (fstat( fd, &st ) == -1) { file_set_error(); return NULL; } if ((file = alloc_object( &file_ops ))) { file->mode = st.st_mode; file->access = default_fd_map_access( &file->obj, access ); if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj, FILE_SYNCHRONOUS_IO_NONALERT ))) { release_object( file ); return NULL; } } return file; } static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode ) { struct file *file = alloc_object( &file_ops ); if (!file) return NULL; file->access = access; file->mode = mode; file->fd = fd; grab_object( fd ); set_fd_user( fd, &file_fd_ops, &file->obj ); return &file->obj; } static struct object *create_file( const char *nameptr, data_size_t len, unsigned int access, unsigned int sharing, int create, unsigned int options, unsigned int attrs, const struct security_descriptor *sd ) { struct object *obj = NULL; struct fd *fd; int flags; char *name; mode_t mode; if (!(name = mem_alloc( len + 1 ))) return NULL; memcpy( name, nameptr, len ); name[len] = 0; switch(create) { case FILE_CREATE: flags = O_CREAT | O_EXCL; break; case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */ case FILE_SUPERSEDE: flags = O_CREAT | O_TRUNC; break; case FILE_OPEN: flags = 0; break; case FILE_OPEN_IF: flags = O_CREAT; break; case FILE_OVERWRITE: flags = O_TRUNC; break; default: set_error( STATUS_INVALID_PARAMETER ); goto done; } if (sd) { const SID *owner = sd_get_owner( sd ); if (!owner) owner = token_get_user( current->process->token ); mode = sd_to_mode( sd, owner ); } else mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666; if (len >= 4 && (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" ))) { if (mode & S_IRUSR) mode |= S_IXUSR; if (mode & S_IRGRP) mode |= S_IXGRP; if (mode & S_IROTH) mode |= S_IXOTH; } access = generic_file_map_access( access ); /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */ fd = open_fd( name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options ); if (!fd) goto done; if (S_ISDIR(mode)) obj = create_dir_obj( fd ); else if (S_ISCHR(mode) && is_serial_fd( fd )) obj = create_serial( fd ); else obj = create_file_obj( fd, access, mode ); release_object( fd ); done: free( name ); return obj; } /* check if two file objects point to the same file */ int is_same_file( struct file *file1, struct file *file2 ) { return is_same_file_fd( file1->fd, file2->fd ); } /* create a temp file for anonymous mappings */ struct file *create_temp_file( int access ) { char tmpfn[16]; int fd; sprintf( tmpfn, "anonmap.XXXXXX" ); /* create it in the server directory */ fd = mkstemps( tmpfn, 0 ); if (fd == -1) { file_set_error(); return NULL; } unlink( tmpfn ); return create_file_for_fd( fd, access, 0 ); } static void file_dump( struct object *obj, int verbose ) { struct file *file = (struct file *)obj; assert( obj->ops == &file_ops ); fprintf( stderr, "File fd=%p\n", file->fd ); } static int file_get_poll_events( struct fd *fd ) { struct file *file = get_fd_user( fd ); int events = 0; assert( file->obj.ops == &file_ops ); if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN; if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT; return events; } static void file_flush( struct fd *fd, struct event **event ) { int unix_fd = get_unix_fd( fd ); if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error(); } static enum server_fd_type file_get_fd_type( struct fd *fd ) { struct file *file = get_fd_user( fd ); if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE; if (S_ISDIR(file->mode)) return FD_TYPE_DIR; return FD_TYPE_CHAR; } static struct fd *file_get_fd( struct object *obj ) { struct file *file = (struct file *)obj; assert( obj->ops == &file_ops ); return (struct fd *)grab_object( file->fd ); } static unsigned int generic_file_map_access( unsigned int access ) { if (access & GENERIC_READ) access |= FILE_GENERIC_READ; if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE; if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE; if (access & GENERIC_ALL) access |= FILE_ALL_ACCESS; return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL); } struct security_descriptor *mode_to_sd( mode_t mode, const SID *user, const SID *group ) { struct security_descriptor *sd; size_t dacl_size; ACE_HEADER *current_ace; ACCESS_ALLOWED_ACE *aaa; ACL *dacl; SID *sid; char *ptr; const SID *world_sid = security_world_sid; const SID *local_system_sid = security_local_system_sid; dacl_size = sizeof(ACL) + FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]); if (mode & S_IRWXU) dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]); if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) || (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) || (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))) dacl_size += FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) + FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]); if (mode & S_IRWXO) dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]); sd = mem_alloc( sizeof(struct security_descriptor) + FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) + FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]) + dacl_size ); if (!sd) return sd; sd->control = SE_DACL_PRESENT; sd->owner_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]); sd->group_len = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]); sd->sacl_len = 0; sd->dacl_len = dacl_size; ptr = (char *)(sd + 1); memcpy( ptr, user, sd->owner_len ); ptr += sd->owner_len; memcpy( ptr, group, sd->group_len ); ptr += sd->group_len; dacl = (ACL *)ptr; dacl->AclRevision = ACL_REVISION; dacl->Sbz1 = 0; dacl->AclSize = dacl_size; dacl->AceCount = 1 + (mode & S_IRWXU ? 1 : 0) + (mode & S_IRWXO ? 1 : 0); if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) || (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) || (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))) dacl->AceCount++; dacl->Sbz2 = 0; /* always give FILE_ALL_ACCESS for Local System */ aaa = (ACCESS_ALLOWED_ACE *)(dacl + 1); current_ace = &aaa->Header; aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE; aaa->Header.AceFlags = 0; aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]); aaa->Mask = FILE_ALL_ACCESS; sid = (SID *)&aaa->SidStart; memcpy( sid, local_system_sid, FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]) ); if (mode & S_IRWXU) { /* appropriate access rights for the user */ aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace ); current_ace = &aaa->Header; aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE; aaa->Header.AceFlags = 0; aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]); aaa->Mask = WRITE_DAC | WRITE_OWNER; if (mode & S_IRUSR) aaa->Mask |= FILE_GENERIC_READ; if (mode & S_IWUSR) aaa->Mask |= FILE_GENERIC_WRITE | DELETE; if (mode & S_IXUSR) aaa->Mask |= FILE_GENERIC_EXECUTE; sid = (SID *)&aaa->SidStart; memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) ); } if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) || (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) || (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))) { /* deny just in case the user is a member of the group */ ACCESS_DENIED_ACE *ada = (ACCESS_DENIED_ACE *)ace_next( current_ace ); current_ace = &ada->Header; ada->Header.AceType = ACCESS_DENIED_ACE_TYPE; ada->Header.AceFlags = 0; ada->Header.AceSize = FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) + FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]); ada->Mask = 0; if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ada->Mask |= FILE_GENERIC_READ; if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IROTH))) ada->Mask |= FILE_GENERIC_WRITE | DELETE; if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))) ada->Mask |= FILE_GENERIC_EXECUTE; ada->Mask &= ~STANDARD_RIGHTS_ALL; /* never deny standard rights */ sid = (SID *)&ada->SidStart; memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) ); } if (mode & S_IRWXO) { /* appropriate access rights for Everyone */ aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace ); current_ace = &aaa->Header; aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE; aaa->Header.AceFlags = 0; aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]); aaa->Mask = 0; if (mode & S_IROTH) aaa->Mask |= FILE_GENERIC_READ; if (mode & S_IWOTH) aaa->Mask |= FILE_GENERIC_WRITE | DELETE; if (mode & S_IXOTH) aaa->Mask |= FILE_GENERIC_EXECUTE; sid = (SID *)&aaa->SidStart; memcpy( sid, world_sid, FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]) ); } return sd; } static struct security_descriptor *file_get_sd( struct object *obj ) { struct file *file = (struct file *)obj; struct stat st; int unix_fd; struct security_descriptor *sd; assert( obj->ops == &file_ops ); unix_fd = get_file_unix_fd( file ); if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return obj->sd; /* mode and uid the same? if so, no need to re-generate security descriptor */ if (obj->sd && (st.st_mode & (S_IRWXU|S_IRWXO)) == (file->mode & (S_IRWXU|S_IRWXO)) && (st.st_uid == file->uid)) return obj->sd; sd = mode_to_sd( st.st_mode, security_unix_uid_to_sid( st.st_uid ), token_get_primary_group( current->process->token )); if (!sd) return obj->sd; file->mode = st.st_mode; file->uid = st.st_uid; free( obj->sd ); obj->sd = sd; return sd; } mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner ) { mode_t new_mode = 0; mode_t denied_mode = 0; int present; const ACL *dacl = sd_get_dacl( sd, &present ); if (present && dacl) { const ACE_HEADER *ace = (const ACE_HEADER *)(dacl + 1); ULONG i; for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace )) { const ACCESS_ALLOWED_ACE *aa_ace; const ACCESS_DENIED_ACE *ad_ace; const SID *sid; if (ace->AceFlags & INHERIT_ONLY_ACE) continue; switch (ace->AceType) { case ACCESS_DENIED_ACE_TYPE: ad_ace = (const ACCESS_DENIED_ACE *)ace; sid = (const SID *)&ad_ace->SidStart; if (security_equal_sid( sid, security_world_sid )) { unsigned int access = generic_file_map_access( ad_ace->Mask ); if (access & FILE_READ_DATA) denied_mode |= S_IRUSR|S_IRGRP|S_IROTH; if (access & FILE_WRITE_DATA) denied_mode |= S_IWUSR|S_IWGRP|S_IWOTH; if (access & FILE_EXECUTE) denied_mode |= S_IXUSR|S_IXGRP|S_IXOTH; } else if (security_equal_sid( sid, owner )) { unsigned int access = generic_file_map_access( ad_ace->Mask ); if (access & FILE_READ_DATA) denied_mode |= S_IRUSR; if (access & FILE_WRITE_DATA) denied_mode |= S_IWUSR; if (access & FILE_EXECUTE) denied_mode |= S_IXUSR; } break; case ACCESS_ALLOWED_ACE_TYPE: aa_ace = (const ACCESS_ALLOWED_ACE *)ace; sid = (const SID *)&aa_ace->SidStart; if (security_equal_sid( sid, security_world_sid )) { unsigned int access = generic_file_map_access( aa_ace->Mask ); if (access & FILE_READ_DATA) new_mode |= S_IRUSR|S_IRGRP|S_IROTH; if (access & FILE_WRITE_DATA) new_mode |= S_IWUSR|S_IWGRP|S_IWOTH; if (access & FILE_EXECUTE) new_mode |= S_IXUSR|S_IXGRP|S_IXOTH; } else if (security_equal_sid( sid, owner )) { unsigned int access = generic_file_map_access( aa_ace->Mask ); if (access & FILE_READ_DATA) new_mode |= S_IRUSR; if (access & FILE_WRITE_DATA) new_mode |= S_IWUSR; if (access & FILE_EXECUTE) new_mode |= S_IXUSR; } break; } } } else /* no ACL means full access rights to anyone */ new_mode = S_IRWXU | S_IRWXO; return new_mode & ~denied_mode; } static int file_set_sd( struct object *obj, const struct security_descriptor *sd, unsigned int set_info ) { struct file *file = (struct file *)obj; const SID *owner; mode_t mode; int unix_fd; assert( obj->ops == &file_ops ); unix_fd = get_file_unix_fd( file ); if (unix_fd == -1) return 1; if (set_info & OWNER_SECURITY_INFORMATION) { owner = sd_get_owner( sd ); if (!owner) { set_error( STATUS_INVALID_SECURITY_DESCR ); return 0; } if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) )) { /* FIXME: get Unix uid and call fchown */ } } else if (obj->sd) owner = sd_get_owner( obj->sd ); else owner = token_get_user( current->process->token ); /* group and sacl not supported */ if (set_info & DACL_SECURITY_INFORMATION) { /* keep the bits that we don't map to access rights in the ACL */ mode = file->mode & (S_ISUID|S_ISGID|S_ISVTX|S_IRWXG); mode |= sd_to_mode( sd, owner ); if (file->mode != mode) { if (fchmod( unix_fd, mode ) == -1) { file_set_error(); return 0; } file->mode = mode; } } return 1; } static void file_destroy( struct object *obj ) { struct file *file = (struct file *)obj; assert( obj->ops == &file_ops ); if (file->fd) release_object( file->fd ); } /* set the last error depending on errno */ void file_set_error(void) { switch (errno) { case ETXTBSY: case EAGAIN: set_error( STATUS_SHARING_VIOLATION ); break; case EBADF: set_error( STATUS_INVALID_HANDLE ); break; case ENOSPC: set_error( STATUS_DISK_FULL ); break; case EACCES: case ESRCH: case EPERM: set_error( STATUS_ACCESS_DENIED ); break; case EROFS: set_error( STATUS_MEDIA_WRITE_PROTECTED ); break; case EBUSY: set_error( STATUS_FILE_LOCK_CONFLICT ); break; case ENOENT: set_error( STATUS_NO_SUCH_FILE ); break; case EISDIR: set_error( STATUS_FILE_IS_A_DIRECTORY ); break; case ENFILE: case EMFILE: set_error( STATUS_TOO_MANY_OPENED_FILES ); break; case EEXIST: set_error( STATUS_OBJECT_NAME_COLLISION ); break; case EINVAL: set_error( STATUS_INVALID_PARAMETER ); break; case ESPIPE: set_error( STATUS_ILLEGAL_FUNCTION ); break; case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break; case EIO: set_error( STATUS_ACCESS_VIOLATION ); break; case ENOTDIR: set_error( STATUS_NOT_A_DIRECTORY ); break; case EFBIG: set_error( STATUS_SECTION_TOO_BIG ); break; case ENODEV: set_error( STATUS_NO_SUCH_DEVICE ); break; case ENXIO: set_error( STATUS_NO_SUCH_DEVICE ); break; #ifdef EOVERFLOW case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break; #endif default: perror("wineserver: file_set_error() can't map error"); set_error( STATUS_UNSUCCESSFUL ); break; } } struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access ) { return (struct file *)get_handle_obj( process, handle, access, &file_ops ); } int get_file_unix_fd( struct file *file ) { return get_unix_fd( file->fd ); } struct file *grab_file_unless_removable( struct file *file ) { if (is_fd_removable( file->fd )) return NULL; return (struct file *)grab_object( file ); } /* extend a file beyond the current end of file */ static int extend_file( struct file *file, file_pos_t new_size ) { static const char zero; int unix_fd = get_file_unix_fd( file ); off_t size = new_size; if (unix_fd == -1) return 0; if (sizeof(new_size) > sizeof(size) && size != new_size) { set_error( STATUS_INVALID_PARAMETER ); return 0; } /* extend the file one byte beyond the requested size and then truncate it */ /* this should work around ftruncate implementations that can't extend files */ if (pwrite( unix_fd, &zero, 1, size ) != -1) { ftruncate( unix_fd, size ); return 1; } file_set_error(); return 0; } /* try to grow the file to the specified size */ int grow_file( struct file *file, file_pos_t size ) { struct stat st; int unix_fd = get_file_unix_fd( file ); if (unix_fd == -1) return 0; if (fstat( unix_fd, &st ) == -1) { file_set_error(); return 0; } if (st.st_size >= size) return 1; /* already large enough */ return extend_file( file, size ); } /* create a file */ DECL_HANDLER(create_file) { struct object *file; const struct object_attributes *objattr = get_req_data(); const struct security_descriptor *sd; const char *name; data_size_t name_len; reply->handle = 0; if (!objattr_is_valid( objattr, get_req_data_size() )) return; /* name is transferred in the unix codepage outside of the objattr structure */ if (objattr->name_len) { set_error( STATUS_INVALID_PARAMETER ); return; } sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL; name = (const char *)get_req_data() + sizeof(*objattr) + objattr->sd_len; name_len = get_req_data_size() - sizeof(*objattr) - objattr->sd_len; reply->handle = 0; if ((file = create_file( name, name_len, req->access, req->sharing, req->create, req->options, req->attrs, sd ))) { reply->handle = alloc_handle( current->process, file, req->access, req->attributes ); release_object( file ); } } /* allocate a file handle for a Unix fd */ DECL_HANDLER(alloc_file_handle) { struct file *file; int fd; reply->handle = 0; if ((fd = thread_get_inflight_fd( current, req->fd )) == -1) { set_error( STATUS_INVALID_HANDLE ); return; } if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE ))) { reply->handle = alloc_handle( current->process, file, req->access, req->attributes ); release_object( file ); } } /* lock a region of a file */ DECL_HANDLER(lock_file) { struct file *file; if ((file = get_file_obj( current->process, req->handle, 0 ))) { reply->handle = lock_fd( file->fd, req->offset, req->count, req->shared, req->wait ); reply->overlapped = is_overlapped( file ); 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 ))) { unlock_fd( file->fd, req->offset, req->count ); release_object( file ); } }