Message tag data structure. More...

#include <types.h>

Collaboration diagram for l4_msgtag_t:

Public Member Functions
long	label () const L4_NOTHROW
	Get the protocol value.

void	label (long v) L4_NOTHROW
	Set the protocol value.

unsigned	words () const L4_NOTHROW
	Get the number of untyped words.

unsigned	items () const L4_NOTHROW
	Get the number of typed items.

unsigned	flags () const L4_NOTHROW
	Get the flags value.

bool	is_page_fault () const L4_NOTHROW
	Test if protocol indicates page-fault protocol.

bool	is_preemption () const L4_NOTHROW
	Test if protocol indicates preemption protocol.

bool	is_sys_exception () const L4_NOTHROW
	Test if protocol indicates system-exception protocol.

bool	is_exception () const L4_NOTHROW
	Test if protocol indicates exception protocol.

bool	is_sigma0 () const L4_NOTHROW
	Test if protocol indicates sigma0 protocol.

bool	is_io_page_fault () const L4_NOTHROW
	Test if protocol indicates IO-page-fault protocol.

unsigned	has_error () const L4_NOTHROW
	Test if flags indicate an error.

Data Fields
l4_mword_t	raw
	raw value

Detailed Description

Message tag data structure.

Include File: #include <l4/sys/types.h>

types.h
Common L4 ABI Data Types.

Describes the details of an IPC operation, in particular which parts of the UTCB have to be transmitted, and also flags to enable real-time and FPU extensions.

The message tag also contains a user-defined label that could be used to specify a protocol ID. Some negative values are reserved for kernel protocols such as page faults and exceptions.

The type must be treated completely opaque.

Examples: examples/libs/l4re/c++/shared_ds/ds_srv.cc, examples/libs/l4re/streammap/server.cc, examples/sys/aliens/main.c, examples/sys/ipc/ipc_example.c, examples/sys/singlestep/main.c, examples/sys/start-with-exc/main.c, and examples/sys/utcb-ipc/main.c.

Definition at line 163 of file types.h.

Member Function Documentation

◆ flags()

unsigned l4_msgtag_t::flags ( ) const

inline

Get the flags value.

The flags are a combination of the flags defined by L4_msgtag_flags.

Definition at line 181 of file types.h.

References raw.

The documentation for this struct was generated from the following file:

l4/sys/types.h

Public Member Functions

Data Fields

Detailed Description

Member Function Documentation

◆ flags()