2 * Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
34 #define LIBSTDBUF "/usr/lib/libstdbuf.so"
36 extern char *__progname;
42 fprintf(stderr, "Usage: %s [-e 0|L|<sz>] [-i 0|L|<sz>] [-o 0|L|<sz>] "
43 "<cmd> [args ...]\n", __progname);
48 main(int argc, char *argv[])
50 char *ibuf, *obuf, *ebuf;
51 char *preload0, *preload1;
54 ibuf = obuf = ebuf = NULL;
55 while ((i = getopt(argc, argv, "e:i:o:")) != -1) {
77 if (ibuf != NULL && setenv("_STDBUF_I", ibuf, 1) == -1)
78 warn("Failed to set environment variable: %s=%s",
80 if (obuf != NULL && setenv("_STDBUF_O", obuf, 1) == -1)
81 warn("Failed to set environment variable: %s=%s",
83 if (ebuf != NULL && setenv("_STDBUF_E", ebuf, 1) == -1)
84 warn("Failed to set environment variable: %s=%s",
87 preload0 = getenv("LD_PRELOAD");
89 i = asprintf(&preload1, "LD_PRELOAD=" LIBSTDBUF);
91 i = asprintf(&preload1, "LD_PRELOAD=%s:%s", preload0,
94 if (i < 0 || putenv(preload1) == -1)
95 warn("Failed to set environment variable: %s", preload1);
97 execvp(argv[0], argv);
98 err(2, "%s", argv[0]);