1 /* vi: set sw=4 ts=4: */
3 * tee implementation for busybox
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 /* BB_AUDIT SUSv3 compliant */
11 /* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
15 int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
16 int tee_main(int argc, char **argv)
18 const char *mode = "w\0a";
24 //TODO: make unconditional
25 #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
27 # define buf bb_common_bufsiz1
31 retval = getopt32(argv, "ia"); /* 'a' must be 2nd */
35 mode += (retval & 2); /* Since 'a' is the 2nd option... */
38 signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
40 retval = EXIT_SUCCESS;
41 /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
42 * that doesn't consume all its input. Good idea... */
43 signal(SIGPIPE, SIG_IGN);
45 /* Allocate an array of FILE *'s, with one extra for a sentinal. */
46 fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
47 np = names = argv - 1;
53 if (NOT_LONE_DASH(*argv)) {
54 *fp = fopen_or_warn(*argv, mode);
56 retval = EXIT_FAILURE;
63 setbuf(*fp, NULL); /* tee must not buffer output. */
67 /* names[0] will be filled later */
69 #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
70 while ((c = safe_read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
73 fwrite(buf, 1, c, *fp++);
76 if (c < 0) { /* Make sure read errors are signaled. */
77 retval = EXIT_FAILURE;
80 setvbuf(stdout, NULL, _IONBF, 0);
81 while ((c = getchar()) != EOF) {
89 /* Now we need to check for i/o errors on stdin and the various
90 * output files. Since we know that the first entry in the output
91 * file table is stdout, we can save one "if ferror" test by
92 * setting the first entry to stdin and checking stdout error
93 * status with fflush_stdout_and_exit()... although fflush()ing
94 * is unnecessary here. */
97 names[0] = (char *) bb_msg_standard_input;
99 do { /* Now check for input and output errors. */
100 /* Checking ferror should be sufficient, but we may want to fclose.
101 * If we do, remember not to close stdin! */
102 die_if_ferror(*fp++, *np++);
105 fflush_stdout_and_exit(retval);