malloc/tst-mtrace.c

   1 /* Test program for mtrace.
   2    Copyright (C) 2000-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <mcheck.h>
  20 #include <paths.h>
  21 #include <search.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26
  27 static void print (const void *node, VISIT value, int level);
  28
  29 /* Used for several purposes.  */
  30 static FILE *fp;
  31
  32
  33 int
  34 main (void)
  35 {
  36   void *root = NULL;
  37   size_t linelen = 0;
  38   char *line = NULL;
  39
  40   /* Enable memory usage tracing.  */
  41   mtrace ();
  42
  43   /* Perform some operations which definitely will allocate some
  44      memory.  */
  45   fp = fopen (__FILE__, "r");
  46   if (fp == NULL)
  47     /* Shouldn't happen since this program is executed in the source
  48        directory.  */
  49     abort ();
  50
  51   while (!feof (fp))
  52     {
  53       char **p;
  54       char *copy;
  55       ssize_t n = getline (&line, &linelen, fp);
  56
  57       if (n < 0)
  58         break;
  59
  60       if (n == 0)
  61         continue;
  62
  63       copy = strdup (line);
  64       if (copy == NULL)
  65         abort ();
  66
  67       p = (char **) tsearch (copy, &root,
  68                              (int (*) (const void *, const void *)) strcmp);
  69       if (*p != copy)
  70         /* This line wasn't added.  */
  71         free (copy);
  72     }
  73
  74   fclose (fp);
  75
  76   fp = fopen (_PATH_DEVNULL, "w");
  77   if (fp != NULL)
  78     {
  79       /* Write something through stdout.  */
  80       twalk (root, print);
  81
  82       fclose (fp);
  83     }
  84
  85   /* Free everything.  */
  86   tdestroy (root, free);
  87
  88   /* Also the line buffer.  */
  89   free (line);
  90
  91   /* That's it.  */
  92   return 0;
  93 }
  94
  95
  96 static void
  97 print (const void *node, VISIT value, int level)
  98 {
  99   static int cnt;
 100   if (value == postorder || value == leaf)
 101     fprintf (fp, "%3d: %s", ++cnt, *(const char **) node);
 102 }