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