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comparison sw/sniff-rx/mainloop.c @ 22:b112c2df6c43

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sw: simtrace3-sniff-rx program written, compiles
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 22 Aug 2023 06:16:44 +0000
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21:c4346cdc9641 22:b112c2df6c43
1 /*
2 * This module holds our main loop code, factored out into a separate
3 * function that is called from main() after initialization.
4 */
5
6 #include <sys/types.h>
7 #include <sys/time.h>
8 #include <sys/errno.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <unistd.h>
12
13 extern int target_fd;
14 extern FILE *main_outf;
15
16 struct timeval curtime;
17
18 main_loop()
19 {
20 fd_set fds;
21 struct timeval tv;
22 u_char buf[512];
23 int cc, i, is_active;
24
25 for (is_active = 0; ; ) {
26 FD_ZERO(&fds);
27 FD_SET(target_fd, &fds);
28 if (is_active) {
29 tv.tv_sec = 1;
30 tv.tv_usec = 0;
31 cc = select(target_fd+1, &fds, 0, 0, &tv);
32 } else
33 cc = select(target_fd+1, &fds, 0, 0, 0);
34 gettimeofday(&curtime, 0);
35 if (cc < 0) {
36 if (errno == EINTR)
37 continue;
38 perror("select");
39 exit(1);
40 }
41 if (cc == 0) {
42 is_active = 0;
43 fflush(main_outf);
44 flush_pending_byte();
45 continue;
46 }
47 cc = read(target_fd, buf, sizeof buf);
48 if (cc < 0) {
49 perror("serial port read");
50 exit(1);
51 }
52 if (cc == 0) {
53 fprintf(stderr, "read EOF from serial port\n");
54 exit(1);
55 }
56 current_date_time();
57 for (i = 0; i < cc; i++)
58 rx_byte_in(buf[i]);
59 is_active = 1;
60 }
61 }