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";
23 int retval = EXIT_SUCCESS;
24 #ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
26 # define buf bb_common_bufsiz1
31 flags = getopt32(argc, argv, "ia"); /* 'a' must be 2nd */
33 mode += (flags & 2); /* Since 'a' is the 2nd option... */
36 signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction.*/
39 /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
40 * that doesn't consume all its input. Good idea... */
41 signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction.*/
43 /* Allocate an array of FILE *'s, with one extra for a sentinal. */
44 p = files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 2));
48 *filenames = (char *) bb_msg_standard_input; /* for later */
52 if ((*p = bb_wfopen(*argv, mode)) == NULL) {
53 retval = EXIT_FAILURE;
56 filenames[(int)(p - files)] = *argv;
58 setbuf(*p, NULL); /* tee must not buffer output. */
62 *p = NULL; /* Store the sentinal value. */
64 #ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
65 while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
66 for (p=files ; *p ; p++) {
67 fwrite(buf, 1, c, *p);
71 if (c < 0) { /* Make sure read errors are signaled. */
72 retval = EXIT_FAILURE;
76 setvbuf(stdout, NULL, _IONBF, 0);
77 while ((c = getchar()) != EOF) {
78 for (p=files ; *p ; p++) {
84 /* Now we need to check for i/o errors on stdin and the various
85 * output files. Since we know that the first entry in the output
86 * file table is stdout, we can save one "if ferror" test by
87 * setting the first entry to stdin and checking stdout error
88 * status with bb_fflush_stdout_and_exit()... although fflush()ing
89 * is unnecessary here. */
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 xferror(*p, filenames[(int)(p - files)]);
99 bb_fflush_stdout_and_exit(retval);