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annotate loadtools/tpinterf.c @ 107:8b44e806b6e1

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loadtools/README: documentation for loadtools should now be complete
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 13 Sep 2013 16:47:09 +0000
parents 05af070c4b60
children
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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. This module will be linked by both
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5 * fc-loadtool and fc-chainload.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <sys/time.h>
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10 #include <sys/errno.h>
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11 #include <stdio.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <stdlib.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 /* definition matches ../target-utils/libcommon/cmdentry.c */
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21 #define MAXCMD 527
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22
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23 /*
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24 * static buffer between tpinterf_make_cmd and tpinterf_send_cmd
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25 *
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26 * We store the command with an ending \r\n so we can use it for
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27 * matching the received echo as well, hence the sizing of the
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28 * buffer.
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29 */
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30 static char cmdbuf[MAXCMD+2];
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31 static int cmdlen;
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32
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33 static int
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34 arg_chars_valid(arg)
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35 char *arg;
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36 {
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37 char *cp;
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38
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39 for (cp = arg; *cp; cp++)
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40 if (*cp < ' ' || *cp > '~')
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41 return(0);
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42 return(1);
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43 }
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44
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45 /*
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46 * This function takes a command for the target in argv form and
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47 * converts it to a space-separated continuous string which can be
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48 * passed as tty "keyboard" input to the target, enforcing length
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49 * and character validity limits in the process. The output is
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50 * stored in an internal static buffer for subsequent
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51 * tpinterf_send_cmd().
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52 *
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53 * Return value: 0 if everything OK, or -1 if some constraint is
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54 * violated.
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55 */
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56 tpinterf_make_cmd(argv)
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57 char **argv;
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58 {
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59 int arglen;
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60 char **ap, *dp;
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61
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62 dp = cmdbuf;
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63 cmdlen = 0;
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64 for (ap = argv; *ap; ap++) {
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65 arglen = strlen(*ap);
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66 if (ap != argv)
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67 arglen++; /* separating space */
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68 if (arglen > MAXCMD - cmdlen)
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69 return(-1);
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70 if (!arg_chars_valid(*ap))
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71 return(-1);
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72 if (ap != argv)
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73 *dp++ = ' ';
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74 strcpy(dp, *ap);
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75 dp += strlen(*ap);
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76 cmdlen += arglen;
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77 }
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78 *dp++ = '\r';
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79 *dp = '\n';
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80 return(0);
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81 }
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82
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83 /*
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84 * This function sends the previously-constructed command to the target,
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85 * and collects the expected echo.
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86 *
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87 * Return value: 0 if successful, -1 on errors (timeout or wrong response)
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88 */
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89 tpinterf_send_cmd()
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90 {
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91 char echobuf[MAXCMD+2];
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92 fd_set fds;
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93 struct timeval tv;
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94 int rcvd, cc;
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95
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96 write(target_fd, cmdbuf, cmdlen + 1);
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97 for (rcvd = 0; rcvd < cmdlen + 2; ) {
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98 FD_ZERO(&fds);
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99 FD_SET(target_fd, &fds);
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100 tv.tv_sec = 1;
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101 tv.tv_usec = 0;
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102 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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103 if (cc < 0) {
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104 if (errno == EINTR)
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105 continue;
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106 perror("select");
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107 return(-1);
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108 }
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109 if (cc < 1) {
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110 fprintf(stderr,
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111 "error: timeout waiting for command echo\n");
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112 return(-1);
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113 }
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114 cc = read(target_fd, echobuf + rcvd, cmdlen + 2 - rcvd);
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115 if (cc <= 0) {
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116 perror("read after successful select");
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117 return(-1);
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118 }
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119 rcvd += cc;
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120 }
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121 if (bcmp(echobuf, cmdbuf, cmdlen + 2)) {
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122 fprintf(stderr, "error: command echo mismatch\n");
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123 return(-1);
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124 } else
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125 return(0);
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126 }
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127
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128 /*
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129 * This functions reads the serial output from the target until a
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130 * '=' prompt is received. All intermediate output is passed to
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131 * stdout.
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132 *
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133 * Return value: 0 if '=' prompt received immediately,
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134 * positive if some scribble came before the prompt, -1 on errors
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135 * (timeout, read errors, etc).
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136 */
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137 tpinterf_pass_output(timeout)
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138 {
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139 char buf[512], *cp;
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140 fd_set fds;
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141 struct timeval tv;
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142 int cc, newline = 1, totout = 0;
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143
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144 for (;;) {
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145 FD_ZERO(&fds);
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146 FD_SET(target_fd, &fds);
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147 tv.tv_sec = timeout;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff changeset
148 tv.tv_usec = 0;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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149 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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parents:
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150 if (cc < 0) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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151 if (errno == EINTR)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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152 continue;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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153 perror("select");
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diff changeset
154 return(-1);
21
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155 }
23
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156 if (cc < 1) {
aca1948e9713 loadtool: initial version compiles and links
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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157 fprintf(stderr,
aca1948e9713 loadtool: initial version compiles and links
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158 "error: timeout waiting for \'=\' prompt from target\n");
21
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159 return(-1);
23
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160 }
21
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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161 cc = read(target_fd, buf, sizeof buf);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
162 if (cc <= 0) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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163 perror("read after successful select");
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aca1948e9713 loadtool: initial version compiles and links
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diff changeset
164 return(-1);
21
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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165 }
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
166 for (cp = buf; cc; cp++) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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167 cc--;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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168 if (*cp == '=' && newline && !cc)
23
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diff changeset
169 return(totout);
21
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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170 putchar(*cp);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff changeset
171 totout++;
21
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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172 if (*cp == '\n')
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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173 newline = 1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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174 else
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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175 newline = 0;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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176 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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177 }
67a39d8914a8 starting work on loadtool
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
178 }