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 */
16 int tee_main(int argc, char **argv)
18 const char *mode = "w\0a";
24 int retval = EXIT_SUCCESS;
25 #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
27 # define buf bb_common_bufsiz1
31 flags = getopt32(argc, argv, "ia"); /* 'a' must be 2nd */
35 mode += (flags & 2); /* Since 'a' is the 2nd option... */
38 signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. */
40 /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
41 * that doesn't consume all its input. Good idea... */
42 signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction. */
44 /* Allocate an array of FILE *'s, with one extra for a sentinal. */
45 fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
46 np = names = argv - 1;
51 *fp = fopen_or_warn(*argv, mode);
53 retval = EXIT_FAILURE;
58 setbuf(*fp++, NULL); /* tee must not buffer output. */
61 /* names[0] will be filled later */
63 #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
64 while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
67 fwrite(buf, 1, c, *fp++);
70 if (c < 0) { /* Make sure read errors are signaled. */
71 retval = EXIT_FAILURE;
74 setvbuf(stdout, NULL, _IONBF, 0);
75 while ((c = getchar()) != EOF) {
83 /* Now we need to check for i/o errors on stdin and the various
84 * output files. Since we know that the first entry in the output
85 * file table is stdout, we can save one "if ferror" test by
86 * setting the first entry to stdin and checking stdout error
87 * status with fflush_stdout_and_exit()... although fflush()ing
88 * is unnecessary here. */
91 names[0] = (char *) bb_msg_standard_input;
93 do { /* Now check for input and output errors. */
94 /* Checking ferror should be sufficient, but we may want to fclose.
95 * If we do, remember not to close stdin! */
96 die_if_ferror(*fp++, *np++);
99 fflush_stdout_and_exit(retval);