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annotate rvinterf/libasync/interf.c @ 1033:5ab737ac3ad7

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TCH special feature documentation update
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 01 Jun 2016 02:06:44 +0000
parents 40b8557b9d04
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * This module implements the link to rvinterf.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <unistd.h>
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9 #include "localsock.h"
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10
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11 extern int sock;
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12
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13 u_char rvi_msg[LOCALSOCK_MAX_MSG];
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14 int rvi_msg_len;
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15
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16 static int rx_state, rx_left;
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17 static u_char *rx_ptr;
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18
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19 void
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20 localsock_prep_for_length_rx()
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21 {
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22 rx_state = 0;
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23 rx_ptr = rvi_msg;
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24 rx_left = 2;
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25 }
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26
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27 static void
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28 prep_for_message_rx()
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29 {
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30 rx_state = 1;
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31 rx_ptr = rvi_msg;
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32 rx_left = rvi_msg_len;
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33 }
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34
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35 void
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36 process_msg_from_rvinterf()
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37 {
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38 switch (rvi_msg[0]) {
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39 case RVI2CLI_PKT_FROM_TARGET:
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40 process_pkt_from_target();
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41 return;
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42 case RVI2CLI_LOCAL_CMD_RESP:
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43 if (rvi_msg_len < 2)
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44 goto bad;
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45 if (rvi_msg[1] == '+')
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46 return;
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47 tty_cleanup();
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48 fprintf(stderr, "Error from rvinterf: %.*s\n", rvi_msg_len - 1,
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49 rvi_msg + 1);
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50 exit(1);
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51 default:
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52 bad:
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53 tty_cleanup();
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54 fprintf(stderr,
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55 "Error: unexpected message type %02X from rvinterf\n",
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56 rvi_msg[0]);
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57 exit(1);
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58 }
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59 }
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60
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61 void
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62 handle_rvinterf_input()
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63 {
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64 int cc;
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65
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66 cc = read(sock, rx_ptr, rx_left);
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67 if (cc <= 0) {
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68 tty_cleanup();
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69 perror("read from rvinterf socket");
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70 exit(1);
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71 }
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72 rx_ptr += cc;
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73 rx_left -= cc;
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74 if (rx_left)
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75 return;
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76 /* got the thing, process it */
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77 if (rx_state) {
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78 process_msg_from_rvinterf();
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79 localsock_prep_for_length_rx();
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80 } else {
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81 rvi_msg_len = rvi_msg[0] << 8 | rvi_msg[1];
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82 if (rvi_msg_len < 1 || rvi_msg_len > LOCALSOCK_MAX_MSG) {
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83 tty_cleanup();
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84 fprintf(stderr,
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85 "Invalid length from rvinterf: %02X%02X\n",
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86 rvi_msg[0], rvi_msg[1]);
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87 exit(1);
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88 }
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89 prep_for_message_rx();
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90 }
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91 }
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92
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93 void
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94 send_pkt_to_target(pkt, pktlen)
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95 u_char *pkt;
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96 {
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97 u_char hdrbuf[3];
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98 int len1;
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99
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100 len1 = pktlen + 1;
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101 hdrbuf[0] = len1 >> 8;
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102 hdrbuf[1] = len1 & 0xFF;
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103 hdrbuf[2] = CLI2RVI_PKT_TO_TARGET;
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104 write(sock, hdrbuf, 3);
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105 write(sock, pkt, pktlen);
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106 }