1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/ioctl.h> 30 31 #include <assert.h> 32 #include <setjmp.h> 33 #include <signal.h> 34 #include <unistd.h> 35 #include <stdlib.h> 36 #include <stdio.h> 37 #include <fcntl.h> 38 39 static sigjmp_buf env; 40 41 static void 42 interrupt(int sig) 43 { 44 siglongjmp(env, sig); 45 } 46 47 int 48 main(int argc, char *argv[]) 49 { 50 const char *file = "/dev/null"; 51 int i, n, fds[10]; 52 struct sigaction act; 53 54 if (argc > 1) { 55 (void) fprintf(stderr, "Usage: %s\n", argv[0]); 56 return (EXIT_FAILURE); 57 } 58 59 act.sa_handler = interrupt; 60 act.sa_flags = 0; 61 62 (void) sigemptyset(&act.sa_mask); 63 (void) sigaction(SIGUSR1, &act, NULL); 64 65 closefrom(0); 66 n = 0; 67 68 /* 69 * With all of our file descriptors closed, wait here spinning in bogus 70 * ioctl() calls until DTrace hits us with a SIGUSR1 to start the test. 71 */ 72 if (sigsetjmp(env, 1) == 0) { 73 for (;;) 74 (void) ioctl(-1, 0, NULL); 75 } 76 77 /* 78 * To test the fds[] array, we open /dev/null (a file with reliable 79 * pathname and properties) using various flags and seek offsets. 80 */ 81 fds[n++] = open(file, O_RDONLY); 82 fds[n++] = open(file, O_WRONLY); 83 fds[n++] = open(file, O_RDWR); 84 85 fds[n++] = open(file, O_RDWR | O_APPEND | O_CREAT | 86 O_NOCTTY | O_NONBLOCK | O_NDELAY | O_SYNC | O_TRUNC | 0666); 87 88 fds[n++] = open(file, O_RDWR); 89 (void) lseek(fds[n - 1], 123, SEEK_SET); 90 91 /* 92 * Once we have all the file descriptors in the state we want to test, 93 * issue a bogus ioctl() on each fd with cmd 0 and arg NULL to whack 94 * our DTrace script into recording the content of the fds[] array. 95 */ 96 for (i = 0; i < n; i++) 97 (void) ioctl(fds[i], 0, NULL); 98 99 assert(n <= sizeof (fds) / sizeof (fds[0])); 100 exit(0); 101 } 102