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annotate loadtools/ttypassthru.c @ 88:ccde45a06737

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nuc-fw: beginning of the configuration mechanism
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 23 Aug 2013 02:02:59 +0000
parents e2e80a09338e
children dfd3110d84e3
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1 /*
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2 * This module implements the pass-thru operation mode, in which
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3 * the Unix host tty is cross-connected directly to the target
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4 * running some code we have just loaded.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/ioctl.h>
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9 #include <sys/errno.h>
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10 #include <termios.h>
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11 #include <stdio.h>
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12 #include <stdlib.h>
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13 #include <unistd.h>
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14 #include <strings.h>
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15
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16 extern int errno;
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17
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18 extern int target_fd;
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19
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20 static struct termios saved_termios, my_termios;
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21
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22 static void
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23 loop()
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24 {
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25 char buf[BUFSIZ];
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26 fd_set fds, fds1;
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27 register int i, cc, max;
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28
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29 FD_ZERO(&fds);
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30 FD_SET(0, &fds);
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31 FD_SET(target_fd, &fds);
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32 max = target_fd + 1;
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33 for (;;) {
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34 bcopy(&fds, &fds1, sizeof(fd_set));
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35 i = select(max, &fds1, NULL, NULL, NULL);
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36 if (i < 0) {
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37 if (errno == EINTR)
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38 continue;
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39 tcsetattr(0, TCSAFLUSH, &saved_termios);
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40 perror("select");
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41 exit(1);
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42 }
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43 if (FD_ISSET(0, &fds1)) {
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44 cc = read(0, buf, sizeof buf);
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45 if (cc <= 0)
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46 return;
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47 if (cc == 1 && buf[0] == 0x1C)
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48 return;
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49 write(target_fd, buf, cc);
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50 }
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51 if (FD_ISSET(target_fd, &fds1)) {
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52 cc = read(target_fd, buf, sizeof buf);
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53 if (cc <= 0) {
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54 tcsetattr(0, TCSAFLUSH, &saved_termios);
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55 fprintf(stderr, "EOF/error on target tty\n");
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56 exit(1);
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57 }
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58 write(1, buf, cc);
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59 }
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60 }
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61 }
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62
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63 tty_passthru()
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64 {
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65 static int zero = 0;
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66
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67 ioctl(target_fd, FIONBIO, &zero);
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68
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69 tcgetattr(0, &saved_termios);
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70 bcopy(&saved_termios, &my_termios, sizeof(struct termios));
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71 cfmakeraw(&my_termios);
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72 my_termios.c_cc[VMIN] = 1;
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73 my_termios.c_cc[VTIME] = 0;
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74 tcsetattr(0, TCSAFLUSH, &my_termios);
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75
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76 printf("Entering tty pass-thru; type ^\\ to exit\r\n\n");
7
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77 loop();
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78 tcsetattr(0, TCSAFLUSH, &saved_termios);
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79 return 0;
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80 }