FreeCalypso > hg > freecalypso-tools

annotate loadtools/ttypassthru.c @ 619:f82551c77e58

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libserial-newlnx: ASYNC_LOW_LATENCY patch reverted Reports from Das Signal indicate that loadtools performance on Debian is about the same as on Slackware, and that including or omitting the ASYNC_LOW_LATENCY patch from Serg makes no difference. Because the patch in question does not appear to be necessary, it is being reverted until and unless someone other than Serg reports an actual real-world system on which loadtools operation times are slowed compared to the Mother's Slackware reference and on which Slackware-like performance can be restored by setting the ASYNC_LOW_LATENCY flag.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 27 Feb 2020 01:09:48 +0000
parents e7502631a0f9
children
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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 }