keychain/ckks/tests/AutoreleaseTest.c

   1 /*
   2  * Copyright (c) 2017 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 #include <fcntl.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28
  29 #include <dispatch/dispatch.h>
  30 #include <objc/objc-internal.h>
  31
  32 #include "AutoreleaseTest.h"
  33
  34 static void
  35 read_releases_pending(int fd, void (^handler)(ssize_t))
  36 {
  37     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  38         ssize_t result = -1;
  39
  40         FILE *fp = fdopen(fd, "r");
  41
  42         char *line = NULL;
  43         size_t linecap = 0;
  44         while (getline(&line, &linecap, fp) > 0) {
  45             ssize_t pending;
  46
  47             if (sscanf(line, "objc[%*d]: %ld releases pending", &pending) == 1) {
  48                 result = pending;
  49                 break;
  50             }
  51         }
  52         free(line);
  53
  54         fclose(fp);
  55
  56         handler(result);
  57     });
  58 }
  59
  60 ssize_t
  61 pending_autorelease_count(void)
  62 {
  63     __block ssize_t result = -1;
  64     dispatch_semaphore_t sema;
  65     int fds[2];
  66     int saved_stderr;
  67
  68     // stderr replacement pipe
  69     pipe(fds);
  70     fcntl(fds[1], F_SETNOSIGPIPE, 1);
  71
  72     // sead asynchronously - takes ownership of fds[0]
  73     sema = dispatch_semaphore_create(0);
  74     read_releases_pending(fds[0], ^(ssize_t pending) {
  75         result = pending;
  76         dispatch_semaphore_signal(sema);
  77     });
  78
  79     // save and replace stderr
  80     saved_stderr = dup(STDERR_FILENO);
  81     dup2(fds[1], STDERR_FILENO);
  82     close(fds[1]);
  83
  84     // make objc print the current autorelease pool
  85     _objc_autoreleasePoolPrint();
  86
  87     // restore stderr
  88     dup2(saved_stderr, STDERR_FILENO);
  89     close(saved_stderr);
  90
  91     // wait for the reader
  92     dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
  93 #if !__has_feature(objc_arc)
  94     dispatch_release(sema);
  95 #endif
  96
  97     return result;
  98 }