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Brian Swetland 8eb5e283cc [magenta] introduce MX_RIGHT_SIGNAL and MX_RIGHT_SIGNAL_PEER

Previously, the ability to set/clear the user signal
bits on an object via mx_object_signal() was controlled
by MX_RIGHT_WRITE and the ability to set/clear the user
signal bits on the peer of a channel, socket, or eventpair
was not restricted at all.

The new rights MX_RIGHT_SIGNAL and MX_RIGHT_SIGNAL_PEER
are now used to provide access control for these operations.

Change-Id: I3d82457c39c062f181615fa40266ac72eae2b802

2017-07-25 20:46:08 +00:00

1.1 KiB

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mx_event_create

NAME

event_create - create an event

SYNOPSIS

#include <magenta/syscalls.h>

mx_status_t mx_event_create(uint32_t options, mx_handle_t* out);

DESCRIPTION

event_create() creates an event, which is an object that is signalable. That is, its MX_USER_SIGNAL_n (where n is 0 through 7) signals can be manipulated using object_signal().

The newly-created handle will have the MX_RIGHT_TRANSFER, MX_RIGHT_DUPLICATE, MX_RIGHT_READ, MX_RIGHT_WRITE, and MX_RIGHT_SIGNAL rights.

RETURN VALUE

event_create() returns MX_OK and a valid event handle (via out) on success. On failure, an error value is returned.

ERRORS

MX_ERR_INVALID_ARGS out is an invalid pointer, or options is nonzero.

MX_ERR_NO_MEMORY Temporary failure due to lack of memory.

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