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
appendenv(const char * key,const char * value)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
usage(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
main(int argc,char * argv[])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