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 #include <assert.h> 28 #include <setjmp.h> 29 #include <signal.h> 30 #include <unistd.h> 31 #include <stdlib.h> 32 #include <stdio.h> 33 #include <fcntl.h> 34 35 static sigjmp_buf env; 36 37 static void 38 interrupt(int sig) 39 { 40 siglongjmp(env, sig); 41 } 42 43 int 44 main(int argc, char *argv[]) 45 { 46 const char *file = "/dev/null"; 47 int i, n, fds[10]; 48 struct sigaction act; 49 50 if (argc > 1) { 51 (void) fprintf(stderr, "Usage: %s\n", argv[0]); 52 return (EXIT_FAILURE); 53 } 54 55 act.sa_handler = interrupt; 56 act.sa_flags = 0; 57 58 (void) sigemptyset(&act.sa_mask); 59 (void) sigaction(SIGUSR1, &act, NULL); 60 61 closefrom(0); 62 n = 0; 63 64 /* 65 * With all of our file descriptors closed, wait here spinning in bogus 66 * ioctl() calls until DTrace hits us with a SIGUSR1 to start the test. 67 */ 68 if (sigsetjmp(env, 1) == 0) { 69 for (;;) 70 (void) ioctl(-1, -1, NULL); 71 } 72 73 /* 74 * To test the fds[] array, we open /dev/null (a file with reliable 75 * pathname and properties) using various flags and seek offsets. 76 */ 77 fds[n++] = open(file, O_RDONLY); 78 fds[n++] = open(file, O_WRONLY); 79 fds[n++] = open(file, O_RDWR); 80 81 fds[n++] = open(file, O_RDWR | O_APPEND | O_CREAT | O_DSYNC | 82 O_LARGEFILE | O_NOCTTY | O_NONBLOCK | O_NDELAY | O_RSYNC | 83 O_SYNC | O_TRUNC | O_XATTR); 84 85 fds[n++] = open(file, O_RDWR); 86 (void) lseek(fds[n - 1], 123, SEEK_SET); 87 88 /* 89 * Once we have all the file descriptors in the state we want to test, 90 * issue a bogus ioctl() on each fd with cmd -1 and arg NULL to whack 91 * our DTrace script into recording the content of the fds[] array. 92 */ 93 for (i = 0; i < n; i++) 94 (void) ioctl(fds[i], -1, NULL); 95 96 assert(n <= sizeof (fds) / sizeof (fds[0])); 97 exit(0); 98 } 99