76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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size_t file_size (char const* file_name)
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{
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struct stat st;
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stat (file_name, &st);
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return st.st_size;
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}
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int
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main (int argc, char const *argv[])
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{
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eputs ("test:mmap\n");
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#if __GNUC__ > 11
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char* file_name = malloc (PATH_MAX);
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#else
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// FIXME: gcc-12.2.0 fails open using this
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char file_name[PATH_MAX];
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#endif
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char *srcdir = getenv ("abs_top_srcdir");
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if (! srcdir) // for running by hand
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srcdir = ".";
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eputs ("srcdir=");
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eputs (srcdir);
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eputs ("\n");
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strcpy (file_name, srcdir);
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strcpy (file_name + strlen (srcdir), "/lib/tests/posix/data/open-read");
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eputs ("test mmap:");
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eputs (file_name);
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eputs ("\n");
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size_t size = file_size (file_name);
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int fd = open (file_name, O_RDONLY, 0);
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assert (fd != -1);
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void* data = mmap (NULL, size, PROT_READ, MAP_PRIVATE | MAP_POPULATE, fd, 0);
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assert(data != MAP_FAILED);
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write (1, data, size);
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int rc = munmap (data, size);
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assert (rc == 0);
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close (fd);
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return 0;
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}
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