1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <err.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 36 #define LIBSTDBUF "/usr/lib/libstdbuf.so" 37 38 extern char *__progname; 39 40 static void 41 usage(int s) 42 { 43 44 fprintf(stderr, "Usage: %s [-e 0|L|B|<sz>] [-i 0|L|B|<sz>] [-o 0|L|B|<sz>] " 45 "<cmd> [args ...]\n", __progname); 46 exit(s); 47 } 48 49 int 50 main(int argc, char *argv[]) 51 { 52 char *ibuf, *obuf, *ebuf; 53 char *preload0, *preload1; 54 int i; 55 56 ibuf = obuf = ebuf = NULL; 57 while ((i = getopt(argc, argv, "e:i:o:")) != -1) { 58 switch (i) { 59 case 'e': 60 ebuf = optarg; 61 break; 62 case 'i': 63 ibuf = optarg; 64 break; 65 case 'o': 66 obuf = optarg; 67 break; 68 case '?': 69 default: 70 usage(1); 71 break; 72 } 73 } 74 argc -= optind; 75 argv += optind; 76 if (argc == 0) 77 exit(0); 78 79 if (ibuf != NULL && setenv("_STDBUF_I", ibuf, 1) == -1) 80 warn("Failed to set environment variable: %s=%s", 81 "_STDBUF_I", ibuf); 82 if (obuf != NULL && setenv("_STDBUF_O", obuf, 1) == -1) 83 warn("Failed to set environment variable: %s=%s", 84 "_STDBUF_O", obuf); 85 if (ebuf != NULL && setenv("_STDBUF_E", ebuf, 1) == -1) 86 warn("Failed to set environment variable: %s=%s", 87 "_STDBUF_E", ebuf); 88 89 preload0 = getenv("LD_PRELOAD"); 90 if (preload0 == NULL) 91 i = asprintf(&preload1, "LD_PRELOAD=" LIBSTDBUF); 92 else 93 i = asprintf(&preload1, "LD_PRELOAD=%s:%s", preload0, 94 LIBSTDBUF); 95 96 if (i < 0 || putenv(preload1) == -1) 97 warn("Failed to set environment variable: LD_PRELOAD"); 98 99 execvp(argv[0], argv); 100 err(2, "%s", argv[0]); 101 } 102