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annotate termhelper.c @ 1356:4d16c09210fd

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Fix resampling code to deal with case in which output frequency is greater than the input frequency. Probably could stand to be improved, but at least it doesn't cause the emulator to deadlock
author Michael Pavone <pavone@retrodev.com>
date Thu, 11 May 2017 07:51:28 -0700
parents 792be135d3af
children
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794
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1 #include <sys/types.h>
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2 #include <sys/stat.h>
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3 #include <fcntl.h>
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4 #include <unistd.h>
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5 #include <stdlib.h>
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6 #include "terminal.h"
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7
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8 char buf[4096];
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9
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10 void copy_data(int to, int from)
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11 {
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12 ssize_t bytes = read(from, buf, sizeof(buf));
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13 while (bytes > 0)
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14 {
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15 ssize_t written = write(to, buf, bytes);
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16 if (written == -1) {
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17 exit(1);
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18 }
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19 bytes -= written;
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20 }
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21 }
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22
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23 int main(int argc, char **argv)
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24 {
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25 //these will block so order is important
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26 int input_fd = open(INPUT_PATH, O_WRONLY);
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27 int output_fd = open(OUTPUT_PATH, O_RDONLY);
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28 fd_set read_fds;
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29 FD_ZERO(&read_fds);
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30 for (;;)
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31 {
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32 FD_SET(STDIN_FILENO, &read_fds);
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33 FD_SET(output_fd, &read_fds);
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34 select(output_fd+1, &read_fds, NULL, NULL, NULL);
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35
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36 if (FD_ISSET(STDIN_FILENO, &read_fds)) {
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37 copy_data(input_fd, STDIN_FILENO);
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38 }
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39 if (FD_ISSET(output_fd, &read_fds)) {
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40 copy_data(STDOUT_FILENO, output_fd);
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41 }
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42 }
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43 return 0;
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44 }