libfuse: fuse-3.10.2/example/poll_client.c Source File

libfuse

poll_client.c
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1 /*
2 FUSE fselclient: FUSE select example client
3 Copyright (C) 2008 SUSE Linux Products GmbH
4 Copyright (C) 2008 Tejun Heo <teheo@suse.de>
5
6 This program can be distributed under the terms of the GNU GPLv2.
7 See the file COPYING.
8 */
9
22 #include <config.h>
23
24 #include <sys/select.h>
25 #include <sys/time.h>
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <fcntl.h>
29 #include <unistd.h>
30 #include <ctype.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <errno.h>
34
35 #define FSEL_FILES 16
36
37 int main(void)
38 {
39 static const char hex_map[FSEL_FILES] = "0123456789ABCDEF";
40 int fds[FSEL_FILES];
41 int i, nfds, tries;
42
43 for (i = 0; i < FSEL_FILES; i++) {
44 char name[] = { hex_map[i], '\0' };
45 fds[i] = open(name, O_RDONLY);
46 if (fds[i] < 0) {
47 perror("open");
48 return 1;
49 }
50 }
51 nfds = fds[FSEL_FILES - 1] + 1;
52
53 for(tries=0; tries < 16; tries++) {
54 static char buf[4096];
55 fd_set rfds;
56 int rc;
57
58 FD_ZERO(&rfds);
59 for (i = 0; i < FSEL_FILES; i++)
60 FD_SET(fds[i], &rfds);
61
62 rc = select(nfds, &rfds, NULL, NULL, NULL);
63
64 if (rc < 0) {
65 perror("select");
66 return 1;
67 }
68
69 for (i = 0; i < FSEL_FILES; i++) {
70 if (!FD_ISSET(fds[i], &rfds)) {
71 printf("_: ");
72 continue;
73 }
74 printf("%X:", i);
75 rc = read(fds[i], buf, sizeof(buf));
76 if (rc < 0) {
77 perror("read");
78 return 1;
79 }
80 printf("%02d ", rc);
81 }
82 printf("\n");
83 }
84 return 0;
85 }