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 29 #include <err.h> 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <unistd.h> 33 34 #define LIBSTDBUF "/usr/lib/libstdbuf.so" 35 #define LIBSTDBUF32 "/usr/lib32/libstdbuf.so" 36 37 static int 38 appendenv(const char *key, const char *value) 39 { 40 char *curval, *newpair; 41 int ret; 42 43 curval = getenv(key); 44 if (curval == NULL) 45 ret = asprintf(&newpair, "%s=%s", key, value); 46 else 47 ret = asprintf(&newpair, "%s=%s:%s", key, curval, value); 48 if (ret > 0) 49 ret = putenv(newpair); 50 if (ret < 0) 51 warn("Failed to set environment variable: %s", key); 52 return (ret); 53 } 54 55 static void 56 usage(void) 57 { 58 59 fprintf(stderr, 60 "usage: stdbuf [-e 0|L|B|<sz>] [-i 0|L|B|<sz>] [-o 0|L|B|<sz>] " 61 "<cmd> [args ...]\n"); 62 exit(1); 63 } 64 65 int 66 main(int argc, char *argv[]) 67 { 68 char *ibuf, *obuf, *ebuf; 69 int i; 70 71 ibuf = obuf = ebuf = NULL; 72 while ((i = getopt(argc, argv, "e:i:o:")) != -1) { 73 switch (i) { 74 case 'e': 75 ebuf = optarg; 76 break; 77 case 'i': 78 ibuf = optarg; 79 break; 80 case 'o': 81 obuf = optarg; 82 break; 83 default: 84 usage(); 85 break; 86 } 87 } 88 argc -= optind; 89 argv += optind; 90 if (argc == 0) 91 exit(0); 92 93 if (ibuf != NULL && setenv("_STDBUF_I", ibuf, 1) == -1) 94 warn("Failed to set environment variable: %s=%s", 95 "_STDBUF_I", ibuf); 96 if (obuf != NULL && setenv("_STDBUF_O", obuf, 1) == -1) 97 warn("Failed to set environment variable: %s=%s", 98 "_STDBUF_O", obuf); 99 if (ebuf != NULL && setenv("_STDBUF_E", ebuf, 1) == -1) 100 warn("Failed to set environment variable: %s=%s", 101 "_STDBUF_E", ebuf); 102 103 appendenv("LD_PRELOAD", LIBSTDBUF); 104 appendenv("LD_32_PRELOAD", LIBSTDBUF32); 105 106 execvp(argv[0], argv); 107 err(2, "%s", argv[0]); 108 } 109