FreeCalypso > hg > freecalypso-tools
annotate loadtools/tpinterf.c @ 619:f82551c77e58
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> |
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date | Thu, 27 Feb 2020 01:09:48 +0000 |
parents | e7502631a0f9 |
children | 8d7dcfd9df53 |
rev | line source |
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0
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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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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
105 continue; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
106 perror("select"); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
107 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
108 } |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
109 if (cc < 1) { |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
110 fprintf(stderr, |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
111 "error: timeout waiting for command echo\n"); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
112 return(-1); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
113 } |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
114 cc = read(target_fd, echobuf + rcvd, cmdlen + 2 - rcvd); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
115 if (cc <= 0) { |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
116 perror("read after successful select"); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
117 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
118 } |
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initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
119 rcvd += cc; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
120 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
121 if (bcmp(echobuf, cmdbuf, cmdlen + 2)) { |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
122 fprintf(stderr, "error: command echo mismatch\n"); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
123 return(-1); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
124 } else |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
125 return(0); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
126 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
127 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
128 /* |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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129 * This functions reads the serial output from the target until a |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
130 * '=' prompt is received. All intermediate output is passed to |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
131 * stdout. |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
132 * |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
133 * Return value: 0 if '=' prompt received immediately, |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
134 * positive if some scribble came before the prompt, -1 on errors |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
135 * (timeout, read errors, etc). |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
136 */ |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
137 tpinterf_pass_output(timeout) |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
138 { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
139 char buf[512], *cp; |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
140 fd_set fds; |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
141 struct timeval tv; |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
142 int cc, newline = 1, totout = 0; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
143 |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
144 for (;;) { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
145 FD_ZERO(&fds); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
146 FD_SET(target_fd, &fds); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
147 tv.tv_sec = timeout; |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
148 tv.tv_usec = 0; |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
149 cc = select(target_fd+1, &fds, NULL, NULL, &tv); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
150 if (cc < 0) { |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
151 if (errno == EINTR) |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
152 continue; |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
153 perror("select"); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
154 return(-1); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
155 } |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
156 if (cc < 1) { |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
157 fprintf(stderr, |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
158 "error: timeout waiting for \'=\' prompt from target\n"); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
159 return(-1); |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
160 } |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
161 cc = read(target_fd, buf, sizeof buf); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
162 if (cc <= 0) { |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
163 perror("read after successful select"); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
164 return(-1); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
165 } |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
166 for (cp = buf; cc; cp++) { |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
167 cc--; |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
168 if (*cp == '=' && newline && !cc) |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
169 return(totout); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
170 putchar(*cp); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
171 totout++; |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
172 if (*cp == '\n') |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
173 newline = 1; |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
174 else |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
175 newline = 0; |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
176 } |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
177 } |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
178 } |