FreeCalypso > hg > freecalypso-tools
annotate loadtools/ttypassthru.c @ 407:19e5a3e2f9c0
fcup-settime: moved time() retrieval a little closer to the output
A fundamental problem with all simple time transfer tools is that there is
always some delay between the time retrieval on the source system and that
transmitted time being set on the destination, and the resulting time
on the destination system is off by that delay amount. This delay cannot
be fully eliminated when working in a simple environment like ours,
but we should make our best effort to minimize it. In the present case,
moving the atinterf_init() call before the time() retrieval should make
a teensy-tiny improvement.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 11 Aug 2018 21:52:17 +0000 |
parents | e7502631a0f9 |
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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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Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
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105 printf("Entering tty pass-thru; type ^\\ to exit\r\n\n"); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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106 loop(); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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107 tcsetattr(0, TCSAFLUSH, &saved_termios); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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108 return 0; |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
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109 } |