FreeCalypso > hg > freecalypso-tools

annotate loadtools/ttypassthru.c @ 1012:11391cb6bdc0

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patch from fixeria: doc change from SE K2x0 to K2xx Since their discovery in late 2022, Sony Ericsson K200 and K220 phones were collectively referred to as SE K2x0 in FreeCalypso documentation. However, now that SE K205 has been discovered as yet another member of the same family (same PCBA in different case), it makes more sense to refer to the whole family as SE K2xx.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 23 Sep 2024 12:23:20 +0000
parents e7502631a0f9
children
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Mychaela Falconia <falcon@freecalypso.org>
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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 safe_output(buf, cc)
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24 u_char *buf;
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25 {
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26 int i, c;
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27
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28 for (i = 0; i < cc; i++) {
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29 c = buf[i];
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30 if (c == '\r' || c == '\n' || c == '\t' || c == '\b') {
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31 putchar(c);
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32 continue;
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33 }
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34 if (c & 0x80) {
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35 putchar('M');
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36 putchar('-');
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37 c &= 0x7F;
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38 }
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39 if (c < 0x20) {
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40 putchar('^');
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41 putchar(c + '@');
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42 } else if (c == 0x7F) {
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43 putchar('^');
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44 putchar('?');
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45 } else
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46 putchar(c);
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47 }
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48 fflush(stdout);
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49 }
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50
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51 static void
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52 loop()
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53 {
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54 char buf[BUFSIZ];
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55 fd_set fds, fds1;
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56 register int i, cc, max;
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57
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58 FD_ZERO(&fds);
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59 FD_SET(0, &fds);
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60 FD_SET(target_fd, &fds);
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61 max = target_fd + 1;
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62 for (;;) {
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63 bcopy(&fds, &fds1, sizeof(fd_set));
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64 i = select(max, &fds1, NULL, NULL, NULL);
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65 if (i < 0) {
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66 if (errno == EINTR)
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67 continue;
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68 tcsetattr(0, TCSAFLUSH, &saved_termios);
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69 perror("select");
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70 exit(1);
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71 }
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72 if (FD_ISSET(0, &fds1)) {
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73 cc = read(0, buf, sizeof buf);
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74 if (cc <= 0)
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75 return;
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76 if (cc == 1 && buf[0] == 0x1C)
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77 return;
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78 write(target_fd, buf, cc);
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79 }
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80 if (FD_ISSET(target_fd, &fds1)) {
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81 cc = read(target_fd, buf, sizeof buf);
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82 if (cc <= 0) {
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83 tcsetattr(0, TCSAFLUSH, &saved_termios);
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84 fprintf(stderr, "EOF/error on target tty\n");
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85 exit(1);
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86 }
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87 safe_output(buf, cc);
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88 }
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89 }
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90 }
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91
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92 tty_passthru()
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93 {
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94 static int zero = 0;
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95
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96 ioctl(target_fd, FIONBIO, &zero);
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97
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98 tcgetattr(0, &saved_termios);
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99 bcopy(&saved_termios, &my_termios, sizeof(struct termios));
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100 cfmakeraw(&my_termios);
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101 my_termios.c_cc[VMIN] = 1;
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102 my_termios.c_cc[VTIME] = 0;
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103 tcsetattr(0, TCSAFLUSH, &my_termios);
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104
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105 printf("Entering tty pass-thru; type ^\\ to exit\r\n\n");
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106 loop();
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107 tcsetattr(0, TCSAFLUSH, &saved_termios);
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108 return 0;
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109 }