1 /* $OpenBSD: tee.c,v 1.10 2015/10/09 01:37:09 deraadt Exp $ */ 2 /* $NetBSD: tee.c,v 1.5 1994/12/09 01:43:39 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/types.h> 34 #include <sys/stat.h> 35 #include <signal.h> 36 #include <errno.h> 37 #include <fcntl.h> 38 #include <unistd.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <locale.h> 43 #include <err.h> 44 45 struct list { 46 struct list *next; 47 int fd; 48 char *name; 49 }; 50 struct list *head; 51 52 static void 53 add(int fd, char *name) 54 { 55 struct list *p; 56 57 if ((p = malloc(sizeof(*p))) == NULL) 58 err(1, NULL); 59 p->fd = fd; 60 p->name = name; 61 p->next = head; 62 head = p; 63 } 64 65 int 66 main(int argc, char *argv[]) 67 { 68 struct list *p; 69 int fd; 70 ssize_t n, rval, wval; 71 char *bp; 72 int append, ch, exitval; 73 char buf[8192]; 74 75 setlocale(LC_ALL, ""); 76 77 if (pledge("stdio wpath cpath", NULL) == -1) 78 err(1, "pledge"); 79 80 append = 0; 81 while ((ch = getopt(argc, argv, "ai")) != -1) { 82 switch(ch) { 83 case 'a': 84 append = 1; 85 break; 86 case 'i': 87 (void)signal(SIGINT, SIG_IGN); 88 break; 89 case '?': 90 default: 91 (void)fprintf(stderr, "usage: tee [-ai] [file ...]\n"); 92 exit(1); 93 } 94 } 95 argv += optind; 96 argc -= optind; 97 98 add(STDOUT_FILENO, "stdout"); 99 100 exitval = 0; 101 while (*argv) { 102 if ((fd = open(*argv, O_WRONLY | O_CREAT | 103 (append ? O_APPEND : O_TRUNC), DEFFILEMODE)) == -1) { 104 warn("%s", *argv); 105 exitval = 1; 106 } else 107 add(fd, *argv); 108 argv++; 109 } 110 111 if (pledge("stdio", NULL) == -1) 112 err(1, "pledge"); 113 114 while ((rval = read(STDIN_FILENO, buf, sizeof(buf))) > 0) { 115 for (p = head; p; p = p->next) { 116 n = rval; 117 bp = buf; 118 do { 119 if ((wval = write(p->fd, bp, n)) == -1) { 120 warn("%s", p->name); 121 exitval = 1; 122 break; 123 } 124 bp += wval; 125 } while (n -= wval); 126 } 127 } 128 if (rval == -1) { 129 warn("read"); 130 exitval = 1; 131 } 132 133 for (p = head; p; p = p->next) { 134 if (close(p->fd) == -1) { 135 warn("%s", p->name); 136 exitval = 1; 137 } 138 } 139 140 exit(exitval); 141 } 142