1 /* $OpenBSD: dup2.c,v 1.1.1.1 2018/04/10 23:00:53 bluhm Exp $ */ 2 /* 3 * Copyright (c) 2018 Alexander Bluhm <bluhm@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <err.h> 19 #include <unistd.h> 20 21 #include "header.h" 22 23 void 24 fdops(int fdpre, int fdpost) 25 { 26 if (dup2(fdpre, 5) == -1) 27 err(1, "dup2 pre"); 28 if (dup2(fdpost, 6) == -1) 29 err(1, "dup2 post"); 30 if (dup2(fdpre, 7) == -1) 31 err(1, "dup2 pepare post overwite"); 32 if (dup2(fdpost, 7) == -1) 33 err(1, "dup2 post overwrite"); 34 if (dup2(fdpost, 8) == -1) 35 err(1, "dup2 pepare pre overwrite"); 36 if (dup2(fdpre, 8) == -1) 37 err(1, "dup2 pre overwite"); 38 if (dup2(fdpre, 9) == -1) 39 err(1, "dup2 pepare pre equal"); 40 if (dup2(9, 9) == -1) 41 err(1, "dup2 pre equal"); 42 if (dup2(fdpost, 10) == -1) 43 err(1, "dup2 pepare post equal"); 44 if (dup2(10, 10) == -1) 45 err(1, "dup2 post equal"); 46 } 47