SystemConfiguration.fproj/SCDNotifierInformViaFD.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2003-2005, 2008-2011, 2013, 2015, 2016 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * Modification History
  26  *
  27  * June 1, 2001                 Allan Nathanson <ajn@apple.com>
  28  * - public API conversion
  29  *
  30  * April 5, 2000                Allan Nathanson <ajn@apple.com>
  31  * - initial revision
  32  */
  33
  34 #include "SCDynamicStoreInternal.h"
  35 #include "config.h"             /* MiG generated file */
  36
  37 #include <paths.h>
  38 #include <unistd.h>
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41 #include <sys/un.h>
  42
  43 Boolean
  44 SCDynamicStoreNotifyFileDescriptor(SCDynamicStoreRef    store,
  45                                     int32_t             identifier,
  46                                     int                 *fd)
  47 {
  48         struct os_activity_scope_state_s        activity_state;
  49         int                                     fildes[2]       = { -1, -1 };
  50         fileport_t                              fileport        = MACH_PORT_NULL;
  51         int                                     ret;
  52         int                                     sc_status;
  53         SCDynamicStorePrivateRef                storePrivate = (SCDynamicStorePrivateRef)store;
  54         kern_return_t                           status;
  55
  56         if (store == NULL) {
  57                 /* sorry, you must provide a session */
  58                 _SCErrorSet(kSCStatusNoStoreSession);
  59                 return FALSE;
  60         }
  61
  62         if (storePrivate->server == MACH_PORT_NULL) {
  63                 /* sorry, you must have an open session to play */
  64                 _SCErrorSet(kSCStatusNoStoreServer);
  65                 return FALSE;
  66         }
  67
  68         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  69                 /* sorry, you can only have one notification registered at once */
  70                 _SCErrorSet(kSCStatusNotifierActive);
  71                 return FALSE;
  72         }
  73
  74         ret = pipe(fildes);
  75         if (ret == -1) {
  76                 _SCErrorSet(errno);
  77                 SC_log(LOG_ERR, "pipe() failed: %s", strerror(errno));
  78                 goto fail;
  79         }
  80
  81         /*
  82          * send fildes[1], the sender's fd, to configd using a fileport and
  83          * return fildes[0] to the caller.
  84          */
  85
  86         fileport = MACH_PORT_NULL;
  87         ret = fileport_makeport(fildes[1], &fileport);
  88         if (ret < 0) {
  89                 _SCErrorSet(errno);
  90                 SC_log(LOG_ERR, "fileport_makeport() failed: %s", strerror(errno));
  91                 goto fail;
  92         }
  93
  94         os_activity_scope_enter(storePrivate->activity, &activity_state);
  95
  96     retry :
  97
  98         status = notifyviafd(storePrivate->server,
  99                              fileport,
 100                              identifier,
 101                              (int *)&sc_status);
 102
 103         if (__SCDynamicStoreCheckRetryAndHandleError(store,
 104                                                      status,
 105                                                      &sc_status,
 106                                                      "SCDynamicStoreNotifyFileDescriptor notifyviafd()")) {
 107                 goto retry;
 108         }
 109
 110         os_activity_scope_leave(&activity_state);
 111
 112         if (status != KERN_SUCCESS) {
 113                 _SCErrorSet(status);
 114                 goto fail;
 115         }
 116
 117         if (sc_status != kSCStatusOK) {
 118                 _SCErrorSet(sc_status);
 119                 goto fail;
 120         }
 121
 122         /* the SCDynamicStore server now has a copy of the write side, close our reference */
 123         (void) close(fildes[1]);
 124
 125         /* and keep the read side */
 126         *fd = fildes[0];
 127
 128         /* set notifier active */
 129         storePrivate->notifyStatus = Using_NotifierInformViaFD;
 130
 131         return TRUE;
 132
 133     fail :
 134
 135         if (fildes[0] != -1) close(fildes[0]);
 136         if (fildes[1] != -1) close(fildes[1]);
 137         return FALSE;
 138 }