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annotate loadtools/tpinterfb.c @ 990:f34261bb3355

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pln-ppb-test: implement PPB erase
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 03 Dec 2023 00:20:14 +0000
parents 8d7dcfd9df53
children
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1 /*
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2 * This module contains functions for binary (as opposed to our usual ASCII)
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3 * interfacing to loadagent.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/time.h>
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8 #include <sys/errno.h>
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9 #include <stdio.h>
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10 #include <string.h>
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11 #include <strings.h>
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12 #include <stdlib.h>
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13 #include <unistd.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 collect_binblock_from_target(buf, expect_len, timeout)
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20 u_char *buf;
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21 unsigned expect_len;
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22 {
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23 fd_set fds;
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24 struct timeval tv;
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25 unsigned rcvd;
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26 int cc;
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27
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28 for (rcvd = 0; rcvd < expect_len; ) {
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29 FD_ZERO(&fds);
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30 FD_SET(target_fd, &fds);
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31 tv.tv_sec = timeout;
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32 tv.tv_usec = 0;
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33 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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34 if (cc < 0) {
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35 if (errno == EINTR)
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36 continue;
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37 perror("select");
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38 return(-1);
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39 }
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40 if (cc < 1) {
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41 fprintf(stderr,
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42 "error: timeout waiting for binary block\n");
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43 return(-1);
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44 }
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45 cc = read(target_fd, buf + rcvd, expect_len - rcvd);
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46 if (cc <= 0) {
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47 perror("read after successful select");
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48 return(-1);
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49 }
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50 rcvd += cc;
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51 }
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52 return(0);
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53 }