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68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
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/* BZ #18877 mmap offset test.
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Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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static int
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printmsg (int rc, const char *msg)
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{
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printf ("%s failed: %m\n", msg);
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return rc;
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}
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/* Check if negative offsets are handled correctly by mmap. */
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static int
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do_test (void)
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{
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const int prot = PROT_READ | PROT_WRITE;
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const int flags = MAP_SHARED;
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const unsigned long length = 0x10000;
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const unsigned long offset = 0xace00000;
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const unsigned long size = offset + length;
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void *addr;
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int fd;
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char fname[] = "tst-mmap-offset-XXXXXX";
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fd = mkstemp64 (fname);
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if (fd < 0)
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return printmsg (1, "mkstemp");
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if (unlink (fname))
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return printmsg (1, "unlink");
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if (ftruncate64 (fd, size))
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return printmsg (0, "ftruncate64");
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addr = mmap (NULL, length, prot, flags, fd, offset);
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if (MAP_FAILED == addr)
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return printmsg (1, "mmap");
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/* This memcpy is likely to SIGBUS if mmap has messed up with offset. */
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memcpy (addr, fname, sizeof (fname));
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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