1 /* $OpenBSD: fcntl.c,v 1.1.1.1 2001/08/15 14:37:11 fgsch Exp $ */ 2 /* 3 * Copyright (c) 1993, 1994, 1995, 1996 by Chris Provenzano and contributors, 4 * proven@mit.edu All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Chris Provenzano, 17 * the University of California, Berkeley, and contributors. 18 * 4. Neither the name of Chris Provenzano, the University, nor the names of 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO, THE REGENTS OR 26 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * Test fcntl() flag inheritance across a fork() 37 */ 38 39 #include <sys/types.h> 40 #include <sys/wait.h> 41 #include <fcntl.h> 42 #include <stdio.h> 43 #include <unistd.h> 44 #include "test.h" 45 46 int 47 main() 48 { 49 int flags, newflags, child; 50 51 CHECKe(flags = fcntl(0, F_GETFL)); 52 printf("flags = %x\n", flags); 53 54 CHECKe(child = fork()); 55 switch(child) { 56 case 0: /* child */ 57 CHECKe(execlp("./pthread_create", "./pthread_create", 58 (char *)NULL)); 59 /* NOTREACHED */ 60 default: /* parent */ 61 CHECKe(wait(NULL)); 62 break; 63 } 64 65 while(1){ 66 CHECKe(newflags = fcntl(0, F_GETFL)); 67 printf ("parent %d flags = %x\n", child, newflags); 68 sleep(1); 69 } 70 } 71