f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy/*
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * CDDL HEADER START
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy *
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * The contents of this file are subject to the terms of the
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * Common Development and Distribution License (the "License").
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * You may not use this file except in compliance with the License.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy *
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * or http://www.opensolaris.org/os/licensing.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * See the License for the specific language governing permissions
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * and limitations under the License.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy *
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * When distributing Covered Code, include this CDDL HEADER in each
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * If applicable, add the following below this CDDL HEADER, with the
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * fields enclosed by brackets "[]" replaced with your own identifying
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * information: Portions Copyright [yyyy] [name of copyright owner]
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy *
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * CDDL HEADER END
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy */
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy/*
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * Use is subject to license terms.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy */
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy/*
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * Copyright (c) 2013 by Delphix. All rights reserved.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy */
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <sys/types.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <sys/stat.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <fcntl.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <thread.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <string.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <stdio.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <unistd.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <stdlib.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy#include <errno.h>
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy/*
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * The size of the output file, "go.out", should be 80*8192*2 = 1310720
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy *
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * $ cd /tmp; go; ls -l go.out
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * done.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * -rwxr-xr-x 1 jdm staff 1310720 Apr 13 19:45 go.out
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * $ cd /zfs; go; ls -l go.out
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * done.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * -rwxr-xr-x 1 jdm staff 663552 Apr 13 19:45 go.out
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy *
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * The file on zfs is short as it does not appear that zfs is making the
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * implicit seek to EOF and the actual write atomic. From the SUSv3
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * interface spec, behavior is undefined if concurrent writes are performed
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * from multi-processes to a single file. So I don't know if this is a
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * standards violation, but I cannot find any such disclaimers in our
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * man pages. This issue came up at a customer site in another context, and
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * the suggestion was to open the file with O_APPEND, but that wouldn't
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy * help with zfs(see 4977529). Also see bug# 5031301.
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy */
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedystatic int outfd = 0;
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedystatic void *
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedygo(void *data)
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy{
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy int i = 0, n = *(int *)data;
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy char buf[8192] = {0};
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy (void) memset(buf, n, sizeof (buf));
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy for (i = 0; i < 80; i++) {
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy (void) write(outfd, buf, sizeof (buf));
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy }
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy return (NULL);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy}
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedystatic void
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedyusage()
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy{
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy (void) fprintf(stderr,
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy "usage: zfs_threadsappend <file name>\n");
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy exit(1);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy}
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedyint
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedymain(int argc, char **argv)
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy{
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy int ret = 0;
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy long ncpus = 0;
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy int i;
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy if (argc != 2) {
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy usage();
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy }
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy ncpus = sysconf(_SC_NPROCESSORS_ONLN);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy if (ncpus < 0) {
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy (void) fprintf(stderr,
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy "Invalid return from sysconf(_SC_NPROCESSORS_ONLN)"
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy " : errno (decimal)=%d\n", errno);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy exit(1);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy }
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy if (ncpus < 2) {
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy (void) fprintf(stderr,
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy "Must execute this binary on a multi-processor system\n");
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy exit(1);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy }
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy outfd = open(argv[optind++], O_RDWR|O_CREAT|O_APPEND|O_TRUNC, 0777);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy if (outfd == -1) {
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy (void) fprintf(stderr,
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy "zfs_threadsappend: "
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy "open(%s, O_RDWR|O_CREAT|O_APPEND|O_TRUNC, 0777)"
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy " failed\n", argv[optind]);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy perror("open");
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy exit(1);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy }
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy for (i = 0; i < 2; i++) {
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy ret = thr_create(NULL, 0, go, (void *)&i, 0, NULL);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy if (ret != 0) {
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy (void) fprintf(stderr,
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy "zfs_threadsappend: thr_create(#%d) "
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy "failed error=%d\n", i+1, ret);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy exit(1);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy }
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy }
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy while (thr_join(0, NULL, NULL) == 0)
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy continue;
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy return (0);
f38cb554a534c6df738be3f4d23327e69888e634John Wren Kennedy}