+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * 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 version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, 2015 Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <assert.h>
+
+int save_errno;
+
+char usage[] =
+"Usage: %s <file>\n"
+" mmap <file> and cat its content\n";
+
+size_t getFilesize(const char *filename)
+{
+ struct stat st;
+
+ if (stat(filename, &st) == -1) {
+ save_errno = errno;
+ perror("stat");
+ exit(save_errno);
+ }
+ return st.st_size;
+}
+
+int main(int argc, char **argv)
+{
+ size_t filesize;
+ int fd;
+ void *mmappedData;
+ int rc;
+
+ if (argc != 2) {
+ fprintf(stderr, usage, argv[0]);
+ exit(1);
+ }
+
+ filesize = getFilesize(argv[1]);
+
+ /* Open file */
+ fd = open(argv[1], O_RDONLY, 0);
+ if (fd == -1) {
+ save_errno = errno;
+ perror("open");
+ exit(save_errno);
+ }
+
+ /* Execute mmap */
+ mmappedData = mmap(NULL, filesize, PROT_READ,
+ MAP_PRIVATE | MAP_POPULATE, fd, 0);
+ if (mmappedData == MAP_FAILED) {
+ save_errno = errno;
+ perror("mmap");
+ exit(save_errno);
+ }
+
+ /* Write the mmapped data to stdout (= FD #1) */
+ rc = write(1, mmappedData, filesize);
+ if (rc == -1) {
+ save_errno = errno;
+ perror("write");
+ exit(save_errno);
+ }
+
+ rc = munmap(mmappedData, filesize);
+ if (rc == -1) {
+ save_errno = errno;
+ perror("munmap");
+ exit(save_errno);
+ }
+
+ rc = close(fd);
+ if (rc == -1) {
+ save_errno = errno;
+ perror("close");
+ exit(save_errno);
+ }
+
+ return 0;
+}
+
git://git.whamcloud.com / fs / lustre-release.git / commitdiff