From: Rémi Bernon rbernon@codeweavers.com
Based on a patch by Huw Davies huw@codeweavers.com. --- server/file.h | 1 + server/mapping.c | 17 +++++++++++++++++ server/protocol.def | 8 ++++++++ server/user.h | 2 ++ server/winstation.c | 12 ++++++++++++ 5 files changed, 40 insertions(+)
diff --git a/server/file.h b/server/file.h index 7f2d1637863..e953120ef80 100644 --- a/server/file.h +++ b/server/file.h @@ -188,6 +188,7 @@ extern struct mapping *create_fd_mapping( struct object *root, const struct unic unsigned int attr, const struct security_descriptor *sd ); extern struct object *create_user_data_mapping( struct object *root, const struct unicode_str *name, unsigned int attr, const struct security_descriptor *sd ); +extern struct object *create_object_mapping( struct object *object, mem_size_t size, void **ptr );
/* device functions */
diff --git a/server/mapping.c b/server/mapping.c index 6b0de1b8b94..90b9c3bbe57 100644 --- a/server/mapping.c +++ b/server/mapping.c @@ -1256,6 +1256,23 @@ int get_page_size(void) return page_mask + 1; }
+struct object *create_object_mapping( struct object *object, mem_size_t size, void **ptr ) +{ + static const unsigned int access = FILE_READ_DATA | FILE_WRITE_DATA; + struct mapping *mapping; + void *tmp; + + if (!(mapping = create_mapping( object, NULL, 0, size, SEC_COMMIT, 0, access, NULL ))) return NULL; + if ((tmp = mmap( NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, get_unix_fd( mapping->fd ), 0 )) == MAP_FAILED) + { + release_object( &mapping->obj ); + return NULL; + } + + *ptr = tmp; + return &mapping->obj; +} + struct object *create_user_data_mapping( struct object *root, const struct unicode_str *name, unsigned int attr, const struct security_descriptor *sd ) { diff --git a/server/protocol.def b/server/protocol.def index 8b51618ebe0..311a7082ef6 100644 --- a/server/protocol.def +++ b/server/protocol.def @@ -879,6 +879,14 @@ typedef struct lparam_t info; } cursor_pos_t;
+/****************************************************************/ +/* objects shared mapping structures */ + +typedef volatile struct +{ + int placeholder; +} desktop_shm_t; + /****************************************************************/ /* Request declarations */
diff --git a/server/user.h b/server/user.h index 8fa55e09b0f..c002be20fa7 100644 --- a/server/user.h +++ b/server/user.h @@ -76,6 +76,8 @@ struct desktop unsigned int users; /* processes and threads using this desktop */ struct global_cursor cursor; /* global cursor information */ unsigned char keystate[256]; /* asynchronous key state */ + struct object *shared_mapping; /* desktop shared memory mapping */ + const desktop_shm_t *shared; /* desktop shared memory (const outside SHARED_WRITE_BEGIN/END) */ };
/* user handles functions */ diff --git a/server/winstation.c b/server/winstation.c index 5903497d61e..cedda7d5470 100644 --- a/server/winstation.c +++ b/server/winstation.c @@ -23,6 +23,7 @@ #include <stdio.h> #include <stdarg.h> #include <sys/types.h> +#include <sys/mman.h>
#include "ntstatus.h" #define WIN32_NO_STATUS @@ -240,6 +241,15 @@ static struct desktop *create_desktop( const struct unicode_str *name, unsigned memset( desktop->keystate, 0, sizeof(desktop->keystate) ); list_add_tail( &winstation->desktops, &desktop->entry ); list_init( &desktop->hotkeys ); + desktop->shared_mapping = NULL; + desktop->shared = NULL; + + if (!(desktop->shared_mapping = create_object_mapping( &desktop->obj, sizeof(*desktop->shared), + (void **)&desktop->shared ))) + { + release_object( desktop ); + return NULL; + } } else { @@ -298,6 +308,8 @@ static void desktop_destroy( struct object *obj ) if (desktop->close_timeout) remove_timeout_user( desktop->close_timeout ); list_remove( &desktop->entry ); release_object( desktop->winstation ); + if (desktop->shared_mapping) release_object( desktop->shared_mapping ); + if (desktop->shared) munmap( (void *)desktop->shared, sizeof(*desktop->shared) ); }
/* retrieve the thread desktop, checking the handle access rights */