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fselclient.c

/*
  FUSE fselclient: FUSE select example client
  Copyright (C) 2008       SUSE Linux Products GmbH
  Copyright (C) 2008       Tejun Heo <teheo@suse.de>

  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.

  gcc -Wall fselclient.c -o fselclient
*/

#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

#define FSEL_FILES      16

int main(void)
{
      static const char hex_map[FSEL_FILES] = "0123456789ABCDEF";
      int fds[FSEL_FILES];
      int i, nfds;

      for (i = 0; i < FSEL_FILES; i++) {
            char name[] = { hex_map[i], '\0' };
            fds[i] = open(name, O_RDONLY);
            if (fds[i] < 0) {
                  perror("open");
                  return 1;
            }
      }
      nfds = fds[FSEL_FILES - 1] + 1;

      while (1) {
            static char buf[4096];
            fd_set rfds;
            int rc;

            FD_ZERO(&rfds);
            for (i = 0; i < FSEL_FILES; i++)
                  FD_SET(fds[i], &rfds);

            rc = select(nfds, &rfds, NULL, NULL, NULL);

            if (rc < 0) {
                  perror("select");
                  return 1;
            }

            for (i = 0; i < FSEL_FILES; i++) {
                  if (!FD_ISSET(fds[i], &rfds)) {
                        printf("_:   ");
                        continue;
                  }
                  printf("%X:", i);
                  rc = read(fds[i], buf, sizeof(buf));
                  if (rc < 0) {
                        perror("read");
                        return 1;
                  }
                  printf("%02d ", rc);
            }
            printf("\n");
      }
}

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