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annotate toys/posix/tee.c @ 1776:7bf68329eb3b draft default tip

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Repository switched to git at https://github.com/landley/toybox
author Rob Landley <rob@landley.net>
date Thu, 09 Apr 2015 02:28:32 -0500
parents 57f2a26fa92c
children
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1 /* tee.c - cat to multiple outputs.
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2 *
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3 * Copyright 2008 Rob Landley <rob@landley.net>
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4 *
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/tee.html
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6
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7 USE_TEE(NEWTOY(tee, "ia", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config TEE
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10 bool "tee"
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11 default y
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12 help
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13 usage: tee [-ai] [file...]
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15 Copy stdin to each listed file, and also to stdout.
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16 Filename "-" is a synonym for stdout.
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18 -a append to files.
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19 -i ignore SIGINT.
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20 */
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21
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22 #define FOR_tee
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23 #include "toys.h"
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25 GLOBALS(
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26 void *outputs;
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27 )
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28
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29 struct fd_list {
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30 struct fd_list *next;
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31 int fd;
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32 };
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34 // Open each output file, saving filehandles to a linked list.
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36 static void do_tee_open(int fd, char *name)
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37 {
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38 struct fd_list *temp;
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40 temp = xmalloc(sizeof(struct fd_list));
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41 temp->next = TT.outputs;
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42 temp->fd = fd;
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43 TT.outputs = temp;
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44 }
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46 void tee_main(void)
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47 {
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48 if (toys.optflags & FLAG_i) xsignal(SIGINT, SIG_IGN);
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50 // Open output files
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51 loopfiles_rw(toys.optargs,
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52 O_RDWR|O_CREAT|((toys.optflags & FLAG_a)?O_APPEND:O_TRUNC),
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53 0666, 0, do_tee_open);
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55 for (;;) {
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56 struct fd_list *fdl;
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57 int len;
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59 // Read data from stdin
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60 len = xread(0, toybuf, sizeof(toybuf));
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61 if (len<1) break;
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63 // Write data to each output file, plus stdout.
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64 fdl = TT.outputs;
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65 for (;;) {
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66 if(len != writeall(fdl ? fdl->fd : 1, toybuf, len)) toys.exitval=1;
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67 if (!fdl) break;
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68 fdl = fdl->next;
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69 }
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70 }
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71 }