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 <assert.h> 30 #include <setjmp.h> 31 #include <signal.h> 32 #include <unistd.h> 33 #include <stdlib.h> 34 #include <stdio.h> 35 #include <fcntl.h> 36 37 static sigjmp_buf env; 38 39 static void 40 interrupt(int sig) 41 { 42 siglongjmp(env, sig); 43 } 44 45 int 46 main(int argc, char *argv[]) 47 { 48 const char *file = "/dev/null"; 49 int i, n, fds[10]; 50 struct sigaction act; 51 52 if (argc > 1) { 53 (void) fprintf(stderr, "Usage: %s\n", argv[0]); 54 return (EXIT_FAILURE); 55 } 56 57 act.sa_handler = interrupt; 58 act.sa_flags = 0; 59 60 (void) sigemptyset(&act.sa_mask); 61 (void) sigaction(SIGUSR1, &act, NULL); 62 63 closefrom(0); 64 n = 0; 65 66 /* 67 * With all of our file descriptors closed, wait here spinning in bogus 68 * ioctl() calls until DTrace hits us with a SIGUSR1 to start the test. 69 */ 70 if (sigsetjmp(env, 1) == 0) { 71 for (;;) 72 (void) ioctl(-1, -1, NULL); 73 } 74 75 /* 76 * To test the fds[] array, we open /dev/null (a file with reliable 77 * pathname and properties) using various flags and seek offsets. 78 */ 79 fds[n++] = open(file, O_RDONLY); 80 fds[n++] = open(file, O_WRONLY); 81 fds[n++] = open(file, O_RDWR); 82 83 fds[n++] = open(file, O_RDWR | O_APPEND | O_CREAT | O_DSYNC | 84 O_LARGEFILE | O_NOCTTY | O_NONBLOCK | O_NDELAY | O_RSYNC | 85 O_SYNC | O_TRUNC | O_XATTR); 86 87 fds[n++] = open(file, O_RDWR); 88 (void) lseek(fds[n - 1], 123, SEEK_SET); 89 90 /* 91 * Once we have all the file descriptors in the state we want to test, 92 * issue a bogus ioctl() on each fd with cmd -1 and arg NULL to whack 93 * our DTrace script into recording the content of the fds[] array. 94 */ 95 for (i = 0; i < n; i++) 96 (void) ioctl(fds[i], -1, NULL); 97 98 assert(n <= sizeof (fds) / sizeof (fds[0])); 99 exit(0); 100 } 101