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annotate loadtools/tpinterf2.c @ 337:a26470040d89

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fc-tmsh: old buglet in the handling of ETM traces
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Tue, 22 Apr 2014 07:42:40 +0000
parents 05af070c4b60
children
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1 /*
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2 * This module provides a more advanced target interface function
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3 * than tpinterf.c - programmatic capture of target responses,
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4 * for dumps etc. It will be linked by fc-loadtool, but not fc-chainload.
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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/time.h>
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9 #include <sys/errno.h>
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10 #include <stdio.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include <stdlib.h>
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14
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15 extern int errno;
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16
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17 extern int target_fd;
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18
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19 /*
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20 * This functions reads the serial output from the target until a
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21 * '=' prompt is received. All intermediate output is parsed into
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22 * lines and passed to a callback function.
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23 *
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24 * The callback function is called with a pointer to each received
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25 * line, stored in a buffer ending in NUL, with CRLF stripped.
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26 * The callback function is expected to return an int. If the
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27 * callback return value is negative, this function returns immediately
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28 * with that negative value. If the callback return value is positive
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29 * or zero, it is added to an accumulator.
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30 *
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31 * Termination: this function returns when it has received a '=' at
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32 * the beginning of a line (return value is the callback return
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33 * accumulator, or 0 if no lines came), if the callback returns a
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34 * negative value (that value is returned), or if an error is detected
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35 * within this function (return value -1, and an error message
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36 * printed on stderr).
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37 */
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38 tpinterf_capture_output(timeout, callback)
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39 int timeout; /* seconds */
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40 int (*callback)();
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41 {
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42 char buf[512], *cp;
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43 char line[1024], *dp = line;
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44 fd_set fds;
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45 struct timeval tv;
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46 int cc, linelen = 0;
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47 int totout = 0, cbret;
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48
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49 for (;;) {
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50 FD_ZERO(&fds);
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51 FD_SET(target_fd, &fds);
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52 tv.tv_sec = timeout;
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53 tv.tv_usec = 0;
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54 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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55 if (cc < 0) {
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56 if (errno == EINTR)
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57 continue;
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58 perror("select");
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59 return(-1);
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60 }
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61 if (cc < 1) {
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62 fprintf(stderr,
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63 "error: timeout waiting for \'=\' prompt from target\n");
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64 return(-1);
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65 }
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66 cc = read(target_fd, buf, sizeof buf);
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67 if (cc <= 0) {
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68 perror("read after successful select");
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69 return(-1);
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70 }
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71 for (cp = buf; cc; cp++) {
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72 cc--;
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73 if (*cp == '=' && !linelen && !cc)
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74 return(totout);
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75 if (*cp == '\r')
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76 continue;
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77 if (*cp == '\n') {
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78 *dp = '\0';
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79 cbret = callback(line);
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80 if (cbret < 0)
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81 return(cbret);
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82 totout += cbret;
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83 dp = line;
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84 linelen = 0;
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85 continue;
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86 }
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87 *dp++ = *cp;
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88 linelen++;
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89 if (linelen >= sizeof line) {
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90 fprintf(stderr,
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91 "error: target response line length exceeds buffer\n");
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92 return(-1);
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93 }
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94 }
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95 }
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96 }
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97
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98 /* single line response capture mechanism */
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99 /* same line buffer size as in tpinterf_capture_output() */
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100 char target_response_line[1024];
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101
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102 static
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103 oneline_catcher(linein)
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104 char *linein;
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105 {
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106 strcpy(target_response_line, linein);
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107 return(1);
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108 }
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109
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110 tpinterf_capture_output_oneline(timeout)
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111 {
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112 return tpinterf_capture_output(timeout, oneline_catcher);
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113 }