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         ssize_t linelen;
  45         while ((linelen = getline(&line, &linecap, fp)) > 0) {
  46             ssize_t pending;
  47
  48             if (sscanf(line, "objc[%*d]: %ld releases pending", &pending) == 1) {
  49                 result = pending;
  50                 break;
  51             }
  52         }
  53         free(line);
  54
  55         fclose(fp);
  56
  57         handler(result);
  58     });
  59 }
  60
  61 ssize_t
  62 pending_autorelease_count(void)
  63 {
  64     __block ssize_t result = -1;
  65     dispatch_semaphore_t sema;
  66     int fds[2];
  67     int saved_stderr;
  68
  69     // stderr replacement pipe
  70     pipe(fds);
  71     fcntl(fds[1], F_SETNOSIGPIPE, 1);
  72
  73     // sead asynchronously - takes ownership of fds[0]
  74     sema = dispatch_semaphore_create(0);
  75     read_releases_pending(fds[0], ^(ssize_t pending) {
  76         result = pending;
  77         dispatch_semaphore_signal(sema);
  78     });
  79
  80     // save and replace stderr
  81     saved_stderr = dup(STDERR_FILENO);
  82     dup2(fds[1], STDERR_FILENO);
  83     close(fds[1]);
  84
  85     // make objc print the current autorelease pool
  86     _objc_autoreleasePoolPrint();
  87
  88     // restore stderr
  89     dup2(saved_stderr, STDERR_FILENO);
  90     close(saved_stderr);
  91
  92     // wait for the reader
  93     dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
  94 #if !__has_feature(objc_arc)
  95     dispatch_release(sema);
  96 #endif
  97
  98     return result;
  99 }