tests/test-fprintf-posix3.c

   1 /* Test of POSIX compatible fprintf() function.
   2    Copyright (C) 2009-2020 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2009.  */
  18
  19 #include <config.h>
  20
  21 #include <stdio.h>
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <errno.h>
  26
  27 #if HAVE_GETRLIMIT && HAVE_SETRLIMIT
  28 # include <sys/types.h>
  29 # include <sys/time.h>
  30 # include <sys/resource.h>
  31 #endif
  32
  33 #include "resource-ext.h"
  34
  35 /* Test against a memory leak in the fprintf replacement.  */
  36
  37 /* Number of iterations across the loop.  */
  38 #define NUM_ROUNDS 1000
  39
  40 /* Number of bytes that are allowed to escape per round.  */
  41 #define MAX_ALLOC_ROUND 10000
  42
  43 /* Number of bytes that are allowed to escape in total.
  44    This should be at least 10 MB, since it includes the normal memory
  45    or address space of the test program.  */
  46 #define MAX_ALLOC_TOTAL (NUM_ROUNDS * MAX_ALLOC_ROUND)
  47
  48 int
  49 main (int argc, char *argv[])
  50 {
  51   uintptr_t initial_rusage_as;
  52   int arg;
  53   int result;
  54
  55   /* Limit the amount of malloc()ed memory to MAX_ALLOC_TOTAL or less.  */
  56
  57   /* On AIX systems, malloc() is limited by RLIMIT_DATA.  */
  58 #if HAVE_GETRLIMIT && HAVE_SETRLIMIT && defined RLIMIT_DATA
  59   {
  60     struct rlimit limit;
  61
  62     if (getrlimit (RLIMIT_DATA, &limit) >= 0)
  63       {
  64         if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > MAX_ALLOC_TOTAL)
  65           limit.rlim_max = MAX_ALLOC_TOTAL;
  66         limit.rlim_cur = limit.rlim_max;
  67         (void) setrlimit (RLIMIT_DATA, &limit);
  68       }
  69   }
  70 #endif
  71   /* On all systems except AIX and OpenBSD, malloc() is limited by RLIMIT_AS.
  72      On some systems, setrlimit of RLIMIT_AS doesn't work but get_rusage_as ()
  73      does.  Allow the address space size to grow by at most MAX_ALLOC_TOTAL.  */
  74   initial_rusage_as = get_rusage_as ();
  75 #if !defined _AIX
  76   if (initial_rusage_as == 0)
  77     return 77;
  78 #endif
  79
  80   arg = atoi (argv[1]);
  81   if (arg == 0)
  82     {
  83       void *memory = malloc (MAX_ALLOC_TOTAL);
  84       if (memory == NULL)
  85         return 1;
  86       memset (memory, 17, MAX_ALLOC_TOTAL);
  87       result = 78;
  88     }
  89   else
  90     {
  91       /* Perform the test and test whether it triggers a permanent memory
  92          allocation of more than MAX_ALLOC_TOTAL bytes.  */
  93       int repeat;
  94
  95       for (repeat = 0; repeat < NUM_ROUNDS; repeat++)
  96         {
  97           /* This may produce a temporary memory allocation of 11000 bytes.
  98              but should not result in a permanent memory allocation.  */
  99           if (fprintf (stdout, "%011000d\n", 17) == -1
 100               && errno == ENOMEM)
 101             return 1;
 102         }
 103
 104       result = 0;
 105     }
 106
 107   if (get_rusage_as () > initial_rusage_as + MAX_ALLOC_TOTAL)
 108     return 1;
 109
 110   return result;
 111 }