18a272653SPeter Holm#!/bin/sh 28a272653SPeter Holm 38a272653SPeter Holm# 48a272653SPeter Holm# Copyright (c) 2017 Dell EMC Isilon 58a272653SPeter Holm# All rights reserved. 68a272653SPeter Holm# 78a272653SPeter Holm# Redistribution and use in source and binary forms, with or without 88a272653SPeter Holm# modification, are permitted provided that the following conditions 98a272653SPeter Holm# are met: 108a272653SPeter Holm# 1. Redistributions of source code must retain the above copyright 118a272653SPeter Holm# notice, this list of conditions and the following disclaimer. 128a272653SPeter Holm# 2. Redistributions in binary form must reproduce the above copyright 138a272653SPeter Holm# notice, this list of conditions and the following disclaimer in the 148a272653SPeter Holm# documentation and/or other materials provided with the distribution. 158a272653SPeter Holm# 168a272653SPeter Holm# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 178a272653SPeter Holm# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 188a272653SPeter Holm# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 198a272653SPeter Holm# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 208a272653SPeter Holm# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 218a272653SPeter Holm# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 228a272653SPeter Holm# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 238a272653SPeter Holm# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 248a272653SPeter Holm# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 258a272653SPeter Holm# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 268a272653SPeter Holm# SUCH DAMAGE. 278a272653SPeter Holm# 288a272653SPeter Holm 29*088cc7d2SAlexander Ziaee# mkfifo(2), select(2) with tmpfs(4) scenario. 308a272653SPeter Holm 318a272653SPeter Holm. ../default.cfg 328a272653SPeter Holm[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 338a272653SPeter Holm 348a272653SPeter Holmdir=/tmp 358a272653SPeter Holmodir=`pwd` 368a272653SPeter Holmcd $dir 378a272653SPeter Holmsed '1,/^EOF/d' < $odir/$0 > $dir/mkfifo6.c 388a272653SPeter Holmmycc -o mkfifo6 -Wall -Wextra -O0 -g mkfifo6.c || exit 1 398a272653SPeter Holmrm -f mkfifo6.c 408a272653SPeter Holmcd $odir 418a272653SPeter Holm 428a272653SPeter Holmmount | grep -q "on $mntpoint " && umount -f $mntpoint 438a272653SPeter Holmmount -o size=1g -t tmpfs tmpfs $mntpoint 448a272653SPeter Holm 458a272653SPeter Holmfifo=$mntpoint/fifo.file 468a272653SPeter Holmcd $mntpoint 478a272653SPeter Holm/tmp/mkfifo6 $fifo 488a272653SPeter Holms=$? 498a272653SPeter Holmcd $odir 508a272653SPeter Holm 518a272653SPeter Holmwhile mount | grep "on $mntpoint " | grep -q tmpfs; do 528a272653SPeter Holm umount $mntpoint || sleep 1 538a272653SPeter Holmdone 548a272653SPeter Holmrm -rf /tmp/mkfifo6 558a272653SPeter Holmexit $s 568a272653SPeter Holm 578a272653SPeter HolmEOF 588a272653SPeter Holm#include <sys/param.h> 598a272653SPeter Holm#include <sys/mman.h> 608a272653SPeter Holm#include <sys/stat.h> 618a272653SPeter Holm#include <sys/wait.h> 628a272653SPeter Holm 638a272653SPeter Holm#include <err.h> 648a272653SPeter Holm#include <errno.h> 658a272653SPeter Holm#include <fcntl.h> 668a272653SPeter Holm#include <signal.h> 678a272653SPeter Holm#include <stdio.h> 688a272653SPeter Holm#include <stdlib.h> 698a272653SPeter Holm#include <time.h> 708a272653SPeter Holm#include <unistd.h> 718a272653SPeter Holm 728a272653SPeter Holmstatic char *path; 738a272653SPeter Holm 748a272653SPeter Holm#define PARALLEL 1 758a272653SPeter Holm 768a272653SPeter Holmstatic void 778a272653SPeter Holmreader(void) 788a272653SPeter Holm{ 798a272653SPeter Holm fd_set rset; 808a272653SPeter Holm struct timeval timeout; 818a272653SPeter Holm int fd, n, r; 828a272653SPeter Holm char ch; 838a272653SPeter Holm 848a272653SPeter Holm do { 858a272653SPeter Holm if((fd = open(path, O_RDONLY)) == -1) 868a272653SPeter Holm if (errno != EINTR) 878a272653SPeter Holm err(1, "open(%s, O_RDONLY)", 888a272653SPeter Holm path); 898a272653SPeter Holm if (fd == -1) 908a272653SPeter Holm warn("open(%s) ro", path); 918a272653SPeter Holm } while (fd == -1); 928a272653SPeter Holm 938a272653SPeter Holm /* timeout */ 948a272653SPeter Holm ch = 'z'; 958a272653SPeter Holm FD_ZERO(&rset); 968a272653SPeter Holm FD_SET(fd, &rset); 978a272653SPeter Holm timeout.tv_sec = 0; 988a272653SPeter Holm timeout.tv_usec = 100000; 998a272653SPeter Holm if ((n = select(fd + 1, &rset, NULL, NULL, &timeout)) < 0) 1008a272653SPeter Holm if (errno != EINTR) 1018a272653SPeter Holm err(1, "select()"); 1028a272653SPeter Holm if (n != 0) 1038a272653SPeter Holm fprintf(stderr, "FAIL Expected n == 0, got %d\n", n); 1048a272653SPeter Holm if (n == 1 && FD_ISSET(fd, &rset)) { 1058a272653SPeter Holm r = read(fd, &ch, 1); 1068a272653SPeter Holm if (r == -1) 1078a272653SPeter Holm err(1, "read"); 1088a272653SPeter Holm if (r != 0) 1098a272653SPeter Holm fprintf(stderr, "read(2): %c\n", ch); 1108a272653SPeter Holm else 1118a272653SPeter Holm fprintf(stderr, "read(2): EOF\n"); 1128a272653SPeter Holm } 1138a272653SPeter Holm 1148a272653SPeter Holm sleep(3); 1158a272653SPeter Holm if (close(fd) == -1) 1168a272653SPeter Holm err(1, "close() in child"); 1178a272653SPeter Holm _exit(n); 1188a272653SPeter Holm} 1198a272653SPeter Holm 1208a272653SPeter Holmstatic void 1218a272653SPeter Holmwriter(void) 1228a272653SPeter Holm{ 1238a272653SPeter Holm int fd; 1248a272653SPeter Holm 1258a272653SPeter Holm do { 1268a272653SPeter Holm if ((fd = open(path, O_WRONLY)) == -1) 1278a272653SPeter Holm if (errno != EINTR) 1288a272653SPeter Holm err(1, "open(%s, O_WRONLY)", 1298a272653SPeter Holm path); 1308a272653SPeter Holm if (fd == -1) 1318a272653SPeter Holm warn("open(%s) wr", path); 1328a272653SPeter Holm } while (fd == -1); 1338a272653SPeter Holm sleep(2); 1348a272653SPeter Holm if (write(fd, "a", 1) != 1) 1358a272653SPeter Holm err(1, "write one"); 1368a272653SPeter Holm if (close(fd) == -1) 1378a272653SPeter Holm warn("close() in parent"); 1388a272653SPeter Holm} 1398a272653SPeter Holm 1408a272653SPeter Holmstatic void 1418a272653SPeter Holmtest(void) 1428a272653SPeter Holm{ 1438a272653SPeter Holm pid_t pid; 1448a272653SPeter Holm int status; 1458a272653SPeter Holm 1468a272653SPeter Holm if ((pid = fork()) == 0) 1478a272653SPeter Holm reader(); 1488a272653SPeter Holm writer(); 1498a272653SPeter Holm 1508a272653SPeter Holm if (waitpid(pid, &status, 0) != pid) 1518a272653SPeter Holm err(1, "waitpid(%d)", pid); 1528a272653SPeter Holm 1538a272653SPeter Holm _exit(status != 0); 1548a272653SPeter Holm} 1558a272653SPeter Holm 1568a272653SPeter Holmint 1578a272653SPeter Holmmain(int argc __unused, char *argv[]) 1588a272653SPeter Holm{ 1598a272653SPeter Holm int e, i, pids[PARALLEL], status; 1608a272653SPeter Holm 1618a272653SPeter Holm if (argc != 2) { 1628a272653SPeter Holm fprintf(stderr, "Usage: %s <fifo file>\n", argv[0]); 1638a272653SPeter Holm exit(1); 1648a272653SPeter Holm } 1658a272653SPeter Holm path = argv[1]; 1668a272653SPeter Holm e = 0; 1678a272653SPeter Holm 1688a272653SPeter Holm unlink(path); 1698a272653SPeter Holm if (mkfifo(path, 0640) == -1) 1708a272653SPeter Holm err(1, "mkfifo(%s)", path); 1718a272653SPeter Holm 1728a272653SPeter Holm for (i = 0; i < PARALLEL; i++) { 1738a272653SPeter Holm if ((pids[i] = fork()) == 0) 1748a272653SPeter Holm test(); 1758a272653SPeter Holm } 1768a272653SPeter Holm for (i = 0; i < PARALLEL; i++) { 1778a272653SPeter Holm if (waitpid(pids[i], &status, 0) == -1) 1788a272653SPeter Holm err(1, "waitpid(%d)", pids[i]); 1798a272653SPeter Holm e += status == 0 ? 0 : 1; 1808a272653SPeter Holm } 1818a272653SPeter Holm 1828a272653SPeter Holm return (e); 1838a272653SPeter Holm} 184