root/maint/gnulib/tests/test-dprintf-posix2.c

/* */

DEFINITIONS

1. main

   1 /* Test of POSIX compatible dprintf() function.
   2    Copyright (C) 2009-2021 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 <unistd.h>
  26 #include <errno.h>
  27 
  28 #if HAVE_GETRLIMIT && HAVE_SETRLIMIT
  29 # include <sys/types.h>
  30 # include <sys/time.h>
  31 # include <sys/resource.h>
  32 #endif
  33 
  34 #include "qemu.h"
  35 #include "resource-ext.h"
  36 
  37 /* Test against a memory leak in the fprintf replacement.  */
  38 
  39 /* Number of iterations across the loop.  */
  40 #define NUM_ROUNDS 1000
  41 
  42 /* Number of bytes that are allowed to escape per round.  */
  43 #define MAX_ALLOC_ROUND 10000
  44 
  45 /* Number of bytes that are allowed to escape in total.
  46    This should be at least 10 MB, since it includes the normal memory
  47    or address space of the test program.  */
  48 #define MAX_ALLOC_TOTAL (NUM_ROUNDS * MAX_ALLOC_ROUND)
  49 
  50 int
  51 main (int argc, char *argv[])
     /*  */
  52 {
  53   uintptr_t initial_rusage_as;
  54   int arg;
  55   int result;
  56 
  57   if (is_running_under_qemu_user ())
  58     {
  59       fprintf (stderr, "Skipping test: cannot trust address space size when running under QEMU\n");
  60       return 79;
  61     }
  62 
  63   /* Limit the amount of malloc()ed memory to MAX_ALLOC_TOTAL or less.  */
  64 
  65   /* On AIX systems, malloc() is limited by RLIMIT_DATA.  */
  66 #if HAVE_GETRLIMIT && HAVE_SETRLIMIT && defined RLIMIT_DATA
  67   {
  68     struct rlimit limit;
  69 
  70     if (getrlimit (RLIMIT_DATA, &limit) >= 0)
  71       {
  72         if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > MAX_ALLOC_TOTAL)
  73           limit.rlim_max = MAX_ALLOC_TOTAL;
  74         limit.rlim_cur = limit.rlim_max;
  75         (void) setrlimit (RLIMIT_DATA, &limit);
  76       }
  77   }
  78 #endif
  79   /* On all systems except AIX and OpenBSD, malloc() is limited by RLIMIT_AS.
  80      On some systems, setrlimit of RLIMIT_AS doesn't work but get_rusage_as ()
  81      does.  Allow the address space size to grow by at most MAX_ALLOC_TOTAL.  */
  82   initial_rusage_as = get_rusage_as ();
  83 #if !defined _AIX
  84   if (initial_rusage_as == 0)
  85     return 77;
  86 #endif
  87 
  88   arg = atoi (argv[1]);
  89   if (arg == 0)
  90     {
  91       void *memory = malloc (MAX_ALLOC_TOTAL);
  92       if (memory == NULL)
  93         return 1;
  94       memset (memory, 17, MAX_ALLOC_TOTAL);
  95       result = 80;
  96     }
  97   else
  98     {
  99       /* Perform the test and test whether it triggers a permanent memory
 100          allocation of more than MAX_ALLOC_TOTAL bytes.  */
 101       int repeat;
 102 
 103       for (repeat = 0; repeat < NUM_ROUNDS; repeat++)
 104         {
 105           /* This may produce a temporary memory allocation of 11000 bytes.
 106              but should not result in a permanent memory allocation.  */
 107           if (dprintf (STDOUT_FILENO, "%011000d\n", 17) == -1
 108               && errno == ENOMEM)
 109             return 1;
 110         }
 111 
 112       result = 0;
 113     }
 114 
 115   if (get_rusage_as () > initial_rusage_as + MAX_ALLOC_TOTAL)
 116     return 1;
 117 
 118   return result;
 119 }

/* */