example/fselclient.c

   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 GPL.
   7   See the file COPYING.
   8
   9   gcc -Wall fselclient.c -o fselclient
  10 */
  11
  12 #include <sys/select.h>
  13 #include <sys/time.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <fcntl.h>
  17 #include <unistd.h>
  18 #include <ctype.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <errno.h>
  22
  23 #define FSEL_FILES      16
  24
  25 int main(void)
  26 {
  27         static const char hex_map[FSEL_FILES] = "0123456789ABCDEF";
  28         int fds[FSEL_FILES];
  29         int i, nfds;
  30
  31         for (i = 0; i < FSEL_FILES; i++) {
  32                 char name[] = { hex_map[i], '\0' };
  33                 fds[i] = open(name, O_RDONLY);
  34                 if (fds[i] < 0) {
  35                         perror("open");
  36                         return 1;
  37                 }
  38         }
  39         nfds = fds[FSEL_FILES - 1] + 1;
  40
  41         while (1) {
  42                 static char buf[4096];
  43                 fd_set rfds;
  44                 int rc;
  45
  46                 FD_ZERO(&rfds);
  47                 for (i = 0; i < FSEL_FILES; i++)
  48                         FD_SET(fds[i], &rfds);
  49
  50                 rc = select(nfds, &rfds, NULL, NULL, NULL);
  51
  52                 if (rc < 0) {
  53                         perror("select");
  54                         return 1;
  55                 }
  56
  57                 for (i = 0; i < FSEL_FILES; i++) {
  58                         if (!FD_ISSET(fds[i], &rfds)) {
  59                                 printf("_:   ");
  60                                 continue;
  61                         }
  62                         printf("%X:", i);
  63                         rc = read(fds[i], buf, sizeof(buf));
  64                         if (rc < 0) {
  65                                 perror("read");
  66                                 return 1;
  67                         }
  68                         printf("%02d ", rc);
  69                 }
  70                 printf("\n");
  71         }
  72 }