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 #define LIBSTDBUF32 "/usr/lib32/libstdbuf.so" 38 39 extern char *__progname; 40 41 static void 42 usage(int s) 43 { 44 45 fprintf(stderr, "Usage: %s [-e 0|L|B|<sz>] [-i 0|L|B|<sz>] [-o 0|L|B|<sz>] " 46 "<cmd> [args ...]\n", __progname); 47 exit(s); 48 } 49 50 int 51 main(int argc, char *argv[]) 52 { 53 char *ibuf, *obuf, *ebuf; 54 char *preload0, *preload1; 55 int i; 56 57 ibuf = obuf = ebuf = NULL; 58 while ((i = getopt(argc, argv, "e:i:o:")) != -1) { 59 switch (i) { 60 case 'e': 61 ebuf = optarg; 62 break; 63 case 'i': 64 ibuf = optarg; 65 break; 66 case 'o': 67 obuf = optarg; 68 break; 69 case '?': 70 default: 71 usage(1); 72 break; 73 } 74 } 75 argc -= optind; 76 argv += optind; 77 if (argc == 0) 78 exit(0); 79 80 if (ibuf != NULL && setenv("_STDBUF_I", ibuf, 1) == -1) 81 warn("Failed to set environment variable: %s=%s", 82 "_STDBUF_I", ibuf); 83 if (obuf != NULL && setenv("_STDBUF_O", obuf, 1) == -1) 84 warn("Failed to set environment variable: %s=%s", 85 "_STDBUF_O", obuf); 86 if (ebuf != NULL && setenv("_STDBUF_E", ebuf, 1) == -1) 87 warn("Failed to set environment variable: %s=%s", 88 "_STDBUF_E", ebuf); 89 90 preload0 = getenv("LD_PRELOAD"); 91 if (preload0 == NULL) 92 i = asprintf(&preload1, "LD_PRELOAD=" LIBSTDBUF); 93 else 94 i = asprintf(&preload1, "LD_PRELOAD=%s:%s", preload0, 95 LIBSTDBUF); 96 97 if (i < 0 || putenv(preload1) == -1) 98 warn("Failed to set environment variable: LD_PRELOAD"); 99 100 preload0 = getenv("LD_32_PRELOAD"); 101 if (preload0 == NULL) 102 i = asprintf(&preload1, "LD_32_PRELOAD=" LIBSTDBUF32); 103 else 104 i = asprintf(&preload1, "LD_32_PRELOAD=%s:%s", preload0, 105 LIBSTDBUF32); 106 107 if (i < 0 || putenv(preload1) == -1) 108 warn("Failed to set environment variable: LD_32_PRELOAD"); 109 110 execvp(argv[0], argv); 111 err(2, "%s", argv[0]); 112 } 113