1 /* vi: set sw=4 ts=4: */
3 * tee implementation for busybox
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 /* BB_AUDIT SUSv3 compliant */
24 /* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
32 int tee_main(int argc, char **argv)
34 const char *mode = "w\0a";
39 int retval = EXIT_SUCCESS;
40 #ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
42 RESERVE_CONFIG_BUFFER(buf, BUFSIZ);
47 flags = bb_getopt_ulflags(argc, argv, "ia"); /* 'a' must be 2nd */
49 mode += (flags & 2); /* Since 'a' is the 2nd option... */
52 signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction.*/
55 /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
56 * that doesn't consume all its input. Good idea... */
57 signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction.*/
59 /* Allocate an array of FILE *'s, with one extra for a sentinal. */
60 p = files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 2));
64 *filenames = (char *) bb_msg_standard_input; /* for later */
68 if ((*p = bb_wfopen(*argv, mode)) == NULL) {
69 retval = EXIT_FAILURE;
72 filenames[(int)(p - files)] = *argv;
74 setbuf(*p, NULL); /* tee must not buffer output. */
78 *p = NULL; /* Store the sentinal value. */
80 #ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
81 while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
82 for (p=files ; *p ; p++) {
83 fwrite(buf, 1, c, *p);
87 if (c < 0) { /* Make sure read errors are signaled. */
88 retval = EXIT_FAILURE;
91 #ifdef CONFIG_FEATURE_CLEAN_UP
92 RELEASE_CONFIG_BUFFER(buf);
96 setvbuf(stdout, NULL, _IONBF, 0);
97 while ((c = getchar()) != EOF) {
98 for (p=files ; *p ; p++) {
104 /* Now we need to check for i/o errors on stdin and the various
105 * output files. Since we know that the first entry in the output
106 * file table is stdout, we can save one "if ferror" test by
107 * setting the first entry to stdin and checking stdout error
108 * status with bb_fflush_stdout_and_exit()... although fflush()ing
109 * is unnecessary here. */
113 do { /* Now check for (input and) output errors. */
114 /* Checking ferror should be sufficient, but we may want to fclose.
115 * If we do, remember not to close stdin! */
116 bb_xferror(*p, filenames[(int)(p - files)]);
119 bb_fflush_stdout_and_exit(retval);