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Cider Isn't Darwin Emulation, Really
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215/* * Copyright (c) 2000, 2001, 2004, 2006, 2009-2011, 2015-2017, 2019 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */
/* * Modification History * * June 1, 2001 Allan Nathanson <ajn@apple.com> * - public API conversion * * March 31, 2000 Allan Nathanson <ajn@apple.com> * - initial revision */
#include "SCDynamicStoreInternal.h"#include "config.h" /* MiG generated file */#include <mach/mach_error.h>
static mach_msg_id_twaitForMachMessage(mach_port_t port){ union { u_int8_t buf[sizeof(mach_msg_empty_t) + MAX_TRAILER_SIZE]; mach_msg_empty_rcv_t msg; } notify_msg; kern_return_t status;
status = mach_msg(¬ify_msg.msg.header, /* msg */ MACH_RCV_MSG, /* options */ 0, /* send_size */ sizeof(notify_msg), /* rcv_size */ port, /* rcv_name */ MACH_MSG_TIMEOUT_NONE, /* timeout */ MACH_PORT_NULL); /* notify */ if (status != KERN_SUCCESS) { SC_log(LOG_NOTICE, "mach_msg() failed: %s", mach_error_string(status)); return -1; }
return notify_msg.msg.header.msgh_id;}
BooleanSCDynamicStoreNotifyWait(SCDynamicStoreRef store){ SCDynamicStorePrivateRef storePrivate = (SCDynamicStorePrivateRef)store; kern_return_t status; mach_port_t port; mach_port_t oldNotify; int sc_status; mach_msg_id_t msgid;
if (store == NULL) { /* sorry, you must provide a session */ _SCErrorSet(kSCStatusNoStoreSession); return FALSE; }
if (storePrivate->server == MACH_PORT_NULL) { /* sorry, you must have an open session to play */ _SCErrorSet(kSCStatusNoStoreServer); return FALSE; }
if (storePrivate->notifyStatus != NotifierNotRegistered) { /* sorry, you can only have one notification registered at once */ _SCErrorSet(kSCStatusNotifierActive); return FALSE; }
/* Allocating port (for server response) */ status = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &port); if (status != KERN_SUCCESS) { SC_log(LOG_ERR, "mach_port_allocate() failed: %s", mach_error_string(status)); _SCErrorSet(status); return FALSE; }
status = mach_port_insert_right(mach_task_self(), port, port, MACH_MSG_TYPE_MAKE_SEND); if (status != KERN_SUCCESS) { /* * We can't insert a send right into our own port! This should * only happen if someone stomped on OUR port (so let's leave * the port alone). */ SC_log(LOG_NOTICE, "mach_port_insert_right() failed: %s", mach_error_string(status)); _SCErrorSet(status); return FALSE; }
/* Request a notification when/if the server dies */ status = mach_port_request_notification(mach_task_self(), port, MACH_NOTIFY_NO_SENDERS, 1, port, MACH_MSG_TYPE_MAKE_SEND_ONCE, &oldNotify); if (status != KERN_SUCCESS) { /* * We can't request a notification for our own port! This should * only happen if someone stomped on OUR port (so let's leave * the port alone). */ SC_log(LOG_NOTICE, "mach_port_request_notification() failed: %s", mach_error_string(status)); _SCErrorSet(status); return FALSE; }
if (oldNotify != MACH_PORT_NULL) { SC_log(LOG_NOTICE, "oldNotify != MACH_PORT_NULL"); }
retry :
status = notifyviaport(storePrivate->server, port, 0, (int *)&sc_status);
if (__SCDynamicStoreCheckRetryAndHandleError(store, status, &sc_status, "SCDynamicStoreNotifyWait notifyviaport()")) { goto retry; }
if (status != KERN_SUCCESS) { if ((status == MACH_SEND_INVALID_DEST) || (status == MIG_SERVER_DIED)) { /* remove the send right that we tried (but failed) to pass to the server */ (void) mach_port_deallocate(mach_task_self(), port); }
/* remove our receive right */ (void) mach_port_mod_refs(mach_task_self(), port, MACH_PORT_RIGHT_RECEIVE, -1); }
if (sc_status != kSCStatusOK) { _SCErrorSet(sc_status); return FALSE; }
/* set notifier active */ storePrivate->notifyStatus = Using_NotifierWait;
msgid = waitForMachMessage(port);
/* set notifier inactive */ storePrivate->notifyStatus = NotifierNotRegistered;
if (msgid == MACH_NOTIFY_NO_SENDERS) { /* the server closed the notifier port */#ifdef DEBUG SC_log(LOG_DEBUG, "notifier port closed, port %d", port);#endif /* DEBUG */ _SCErrorSet(kSCStatusNoStoreServer); return FALSE; }
if (msgid == -1) { /* one of the mach routines returned an error */#ifdef DEBUG SC_log(LOG_DEBUG, "communication with server failed, remove port right %d", port);#endif /* DEBUG */ (void) mach_port_mod_refs(mach_task_self(), port, MACH_PORT_RIGHT_RECEIVE , -1); _SCErrorSet(kSCStatusNoStoreServer); return FALSE; }
// something changed, cancelling notification request status = notifycancel(storePrivate->server, (int *)&sc_status);
if (__SCDynamicStoreCheckRetryAndHandleError(store, status, &sc_status, "SCDynamicStoreNotifyWait notifycancel()")) { sc_status = kSCStatusOK; }
/* remove our receive right */ (void) mach_port_mod_refs(mach_task_self(), port, MACH_PORT_RIGHT_RECEIVE , -1);
if (sc_status != kSCStatusOK) { _SCErrorSet(sc_status); return FALSE; }
return TRUE;}