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binutils-gdb/gdb/testsuite/gdb.base/find-unmapped.c
Joel Brobecker 61baf725ec update copyright year range in GDB files
This applies the second part of GDB's End of Year Procedure, which
updates the copyright year range in all of GDB's files.

gdb/ChangeLog:

        Update copyright year range in all GDB files.
2017-01-01 10:52:34 +04:00

107 lines
2.9 KiB
C

/* This testcase is part of GDB, the GNU debugger.
Copyright 2012-2017 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
#include <string.h>
#define CHUNK_SIZE 16000 /* same as findcmd.c's */
void *global_var_0;
void *global_var_1;
void *global_var_2;
void
breakpt ()
{
/* Nothing. */
}
int
main (void)
{
void *p;
size_t pg_size;
int pg_count;
void *unmapped_page, *last_mapped_page, *first_mapped_page;
/*
Map enough pages to cover at least CHUNK_SIZE, and one extra page. We
then unmap the last page.
From gdb we can then perform find commands into unmapped region, gdb
should give an error.
.-- global_var_0 .-- global_var_1
| | .-- global_var_2
| | |
.----.----.----.----.----.
| | | | | |
'----'----'----'----'----'
|<- CHUNK_SIZE ->|
If CHUNK_SIZE equals page size then we'll get 3 pages, and if
CHUNK_SIZE is less than page size we'll get 2 pages. The test will
still work in these cases.
(1) We do a find from global_var_0 to global_var_2, this will fail when
loading the second chunk, as we know at least CHUNK_SIZE bytes are in
mapped space.
(2) We do a find from global_var_1 to global_var_2, this will fail when
loading the first chunk, assuming the CHUNK_SIZE is at least 16 bytes.
(3) We do a find from global_var_2 to (global_var_2 + 16), this too
will fail when loading the first chunk regardless of the chunk size.
*/
pg_size = getpagesize ();
/* The +2 ensures the extra page. */
pg_count = CHUNK_SIZE / pg_size + 2;
p = mmap (0, pg_count * pg_size, PROT_READ|PROT_WRITE,
MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
if (p == MAP_FAILED)
{
perror ("mmap");
return EXIT_FAILURE;
}
memset (p, 0, pg_count * pg_size);
if (munmap (p + (pg_count - 1) * pg_size, pg_size) == -1)
{
perror ("munmap");
return EXIT_FAILURE;
}
first_mapped_page = p;
last_mapped_page = p + (pg_count - 2) * pg_size;
unmapped_page = last_mapped_page + pg_size;
/* Setup global variables we reference from gdb. */
global_var_0 = first_mapped_page;
global_var_1 = unmapped_page - 16;
global_var_2 = unmapped_page + 16;
breakpt ();
return EXIT_SUCCESS;
}