1 /*- 2 * Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 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 extern char *__progname; 38 39 static void 40 usage(int s) 41 { 42 43 fprintf(stderr, "Usage: %s [-e 0|L|<sz>] [-i 0|L|<sz>] [-o 0|L|<sz>] " 44 "<cmd> [args ...]\n", __progname); 45 exit(s); 46 } 47 48 int 49 main(int argc, char *argv[]) 50 { 51 char *ibuf, *obuf, *ebuf; 52 char *preload0, *preload1; 53 int i; 54 55 ibuf = obuf = ebuf = NULL; 56 while ((i = getopt(argc, argv, "e:i:o:")) != -1) { 57 switch (i) { 58 case 'e': 59 ebuf = optarg; 60 break; 61 case 'i': 62 ibuf = optarg; 63 break; 64 case 'o': 65 obuf = optarg; 66 break; 67 case '?': 68 default: 69 usage(1); 70 break; 71 } 72 } 73 argc -= optind; 74 argv += optind; 75 if (argc == 0) 76 exit(0); 77 78 if (ibuf != NULL && setenv("_STDBUF_I", ibuf, 1) == -1) 79 warn("Failed to set environment variable: %s=%s", 80 "_STDBUF_I", ibuf); 81 if (obuf != NULL && setenv("_STDBUF_O", obuf, 1) == -1) 82 warn("Failed to set environment variable: %s=%s", 83 "_STDBUF_O", obuf); 84 if (ebuf != NULL && setenv("_STDBUF_E", ebuf, 1) == -1) 85 warn("Failed to set environment variable: %s=%s", 86 "_STDBUF_E", ebuf); 87 88 preload0 = getenv("LD_PRELOAD"); 89 if (preload0 == NULL) 90 i = asprintf(&preload1, "LD_PRELOAD=" LIBSTDBUF); 91 else 92 i = asprintf(&preload1, "LD_PRELOAD=%s:%s", preload0, 93 LIBSTDBUF); 94 95 if (i < 0 || putenv(preload1) == -1) 96 warn("Failed to set environment variable: LD_PRELOAD"); 97 98 preload0 = getenv("LD_32_PRELOAD"); 99 if (preload0 == NULL) 100 i = asprintf(&preload1, "LD_32_PRELOAD=" LIBSTDBUF32); 101 else 102 i = asprintf(&preload1, "LD_32_PRELOAD=%s:%s", preload0, 103 LIBSTDBUF32); 104 105 if (i < 0 || putenv(preload1) == -1) 106 warn("Failed to set environment variable: LD_32_PRELOAD"); 107 108 execvp(argv[0], argv); 109 err(2, "%s", argv[0]); 110 } 111