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annotate loadtools/tpinterf.c @ 23:aca1948e9713

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loadtool: initial version compiles and links
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sat, 04 May 2013 04:52:05 +0000
parents 67a39d8914a8
children 05af070c4b60
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1 /*
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2 * Target program interface - this module provides some primitives
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3 * for communicating programmatically with loadagent and possibly
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4 * other target-utils.
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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 /* definition matches ../target-utils/libcommon/cmdentry.c */
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20 #define MAXCMD 527
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21
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22 /*
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23 * static buffer between tpinterf_make_cmd and tpinterf_send_cmd
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24 *
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25 * We store the command with an ending \r\n so we can use it for
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26 * matching the received echo as well, hence the sizing of the
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27 * buffer.
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28 */
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29 static char cmdbuf[MAXCMD+2];
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30 static int cmdlen;
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31
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32 static int
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33 arg_chars_valid(arg)
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34 char *arg;
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35 {
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36 char *cp;
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37
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38 for (cp = arg; *cp; cp++)
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39 if (*cp < ' ' || *cp > '~')
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40 return(0);
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41 return(1);
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42 }
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43
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44 /*
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45 * This function takes a command for the target in argv form and
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46 * converts it to a space-separated continuous string which can be
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47 * passed as tty "keyboard" input to the target, enforcing length
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48 * and character validity limits in the process. The output is
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49 * stored in an internal static buffer for subsequent
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50 * tpinterf_send_cmd().
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51 *
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52 * Return value: 0 if everything OK, or -1 if some constraint is
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53 * violated.
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54 */
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55 tpinterf_make_cmd(argv)
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56 char **argv;
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57 {
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58 int arglen;
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59 char **ap, *dp;
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60
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61 dp = cmdbuf;
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62 cmdlen = 0;
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63 for (ap = argv; *ap; ap++) {
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64 arglen = strlen(*ap);
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65 if (ap != argv)
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66 arglen++; /* separating space */
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67 if (arglen > MAXCMD - cmdlen)
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68 return(-1);
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69 if (!arg_chars_valid(*ap))
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70 return(-1);
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71 if (ap != argv)
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72 *dp++ = ' ';
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73 strcpy(dp, *ap);
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74 dp += strlen(*ap);
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75 cmdlen += arglen;
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76 }
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77 *dp++ = '\r';
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78 *dp = '\n';
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79 return(0);
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80 }
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81
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82 /*
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83 * This function sends the previously-constructed command to the target,
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84 * and collects the expected response.
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85 *
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86 * Return value: 0 if successful, -1 on errors (timeout or wrong response)
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87 */
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88 tpinterf_send_cmd()
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89 {
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90 char echobuf[MAXCMD+2];
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91 fd_set fds;
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92 struct timeval tv;
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93 int rcvd, cc;
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94
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95 write(target_fd, cmdbuf, cmdlen + 1);
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96 for (rcvd = 0; rcvd < cmdlen + 2; ) {
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97 FD_ZERO(&fds);
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98 FD_SET(target_fd, &fds);
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99 tv.tv_sec = 1;
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100 tv.tv_usec = 0;
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101 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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102 if (cc < 0) {
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103 if (errno == EINTR)
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104 continue;
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105 perror("select");
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106 return(-1);
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107 }
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108 if (cc < 1) {
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109 fprintf(stderr,
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110 "error: timeout waiting for command echo\n");
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111 return(-1);
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112 }
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113 cc = read(target_fd, echobuf + rcvd, cmdlen + 2 - rcvd);
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114 if (cc <= 0) {
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115 perror("read after successful select");
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116 return(-1);
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117 }
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118 rcvd += cc;
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119 }
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120 if (bcmp(echobuf, cmdbuf, cmdlen + 2)) {
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121 fprintf(stderr, "error: command echo mismatch\n");
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122 return(-1);
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123 } else
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124 return(0);
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125 }
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126
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127 /*
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128 * This functions reads the serial output from the target until a
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129 * '=' prompt is received. All intermediate output is passed to
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130 * stdout.
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131 *
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132 * Return value: 0 if '=' prompt received immediately,
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133 * positive if some scribble came before the prompt, -1 on errors
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134 * (timeout, read errors, etc).
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135 */
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136 tpinterf_pass_output(timeout)
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137 {
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138 char buf[512], *cp;
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139 fd_set fds;
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140 struct timeval tv;
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141 int cc, newline = 1, totout = 0;
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142
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143 for (;;) {
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144 FD_ZERO(&fds);
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145 FD_SET(target_fd, &fds);
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146 tv.tv_sec = timeout;
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147 tv.tv_usec = 0;
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148 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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149 if (cc < 0) {
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150 if (errno == EINTR)
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151 continue;
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152 perror("select");
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153 return(-1);
21
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154 }
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155 if (cc < 1) {
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156 fprintf(stderr,
aca1948e9713 loadtool: initial version compiles and links
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157 "error: timeout waiting for \'=\' prompt from target\n");
21
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158 return(-1);
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159 }
21
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160 cc = read(target_fd, buf, sizeof buf);
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161 if (cc <= 0) {
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162 perror("read after successful select");
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163 return(-1);
21
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164 }
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165 for (cp = buf; cc; cp++) {
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166 cc--;
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167 if (*cp == '=' && newline && !cc)
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168 return(totout);
21
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169 putchar(*cp);
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170 totout++;
21
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171 if (*cp == '\n')
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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172 newline = 1;
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parents:
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173 else
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174 newline = 0;
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175 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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176 }
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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177 }