node/deps/libeio/demo.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <poll.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "eio.h"

int respipe [2];

void
want_poll (void)
{
  char dummy;
  printf ("want_poll ()\n");
  write (respipe [1], &dummy, 1);
}

void
done_poll (void)
{
  char dummy;
  printf ("done_poll ()\n");
  read (respipe [0], &dummy, 1);
}

void
event_loop (void)
{
  // an event loop. yeah.
  struct pollfd pfd;
  pfd.fd     = respipe [0];
  pfd.events = POLLIN;

  printf ("\nentering event loop\n");
  while (eio_nreqs ())
    {
      poll (&pfd, 1, -1);
      printf ("eio_poll () = %d\n", eio_poll ());
    }
  printf ("leaving event loop\n");
}

int
res_cb (eio_req *req)
{
  printf ("res_cb(%d|%s) = %d\n", req->type, req->data ? req->data : "?", EIO_RESULT (req));

  if (req->result < 0)
    abort ();

  return 0;
}

int
readdir_cb (eio_req *req)
{
  char *buf = (char *)EIO_BUF (req);

  printf ("readdir_cb = %d\n", EIO_RESULT (req));

  if (EIO_RESULT (req) < 0)
    return 0;

  while (EIO_RESULT (req)--)
    {
      printf ("readdir = <%s>\n", buf);
      buf += strlen (buf) + 1;
    }

  return 0;
}

int
stat_cb (eio_req *req)
{
  struct stat *buf = EIO_STAT_BUF (req);

  if (req->type == EIO_FSTAT)
    printf ("fstat_cb = %d\n", EIO_RESULT (req));
  else
    printf ("stat_cb(%s) = %d\n", EIO_PATH (req), EIO_RESULT (req));

  if (!EIO_RESULT (req))
    printf ("stat size %d perm 0%o\n", buf->st_size, buf->st_mode & 0777);

  return 0;
}

int
read_cb (eio_req *req)
{
  unsigned char *buf = (unsigned char *)EIO_BUF (req);

  printf ("read_cb = %d (%02x%02x%02x%02x %02x%02x%02x%02x)\n",
          EIO_RESULT (req),
          buf [0], buf [1], buf [2], buf [3],
          buf [4], buf [5], buf [6], buf [7]);

  return 0;
}

int last_fd;

int
open_cb (eio_req *req)
{
  printf ("open_cb = %d\n", EIO_RESULT (req));

  last_fd = EIO_RESULT (req);

  return 0;
}

int
main (void)
{
  printf ("pipe ()\n");
  if (pipe (respipe)) abort ();

  printf ("eio_init ()\n");
  if (eio_init (want_poll, done_poll)) abort ();

  do
    {
      /* avoid relative paths yourself(!) */
      eio_mkdir ("eio-test-dir", 0777, 0, res_cb, "mkdir");
      eio_nop (0, res_cb, "nop");
      event_loop ();

      eio_stat ("eio-test-dir", 0, stat_cb, "stat");
      eio_lstat ("eio-test-dir", 0, stat_cb, "stat");
      eio_open ("eio-test-dir/eio-test-file", O_RDWR | O_CREAT, 0777, 0, open_cb, "open");
      eio_symlink ("test", "eio-test-dir/eio-symlink", 0, res_cb, "symlink");
      eio_mknod ("eio-test-dir/eio-fifo", S_IFIFO, 0, 0, res_cb, "mknod");
      event_loop ();

      eio_utime ("eio-test-dir", 12345.678, 23456.789, 0, res_cb, "utime");
      eio_futime (last_fd, 92345.678, 93456.789, 0, res_cb, "futime");
      eio_chown ("eio-test-dir", getuid (), getgid (), 0, res_cb, "chown");
      eio_fchown (last_fd, getuid (), getgid (), 0, res_cb, "fchown");
      eio_fchmod (last_fd, 0723, 0, res_cb, "fchmod");
      eio_readdir ("eio-test-dir", 0, 0, readdir_cb, "readdir");
      eio_readdir ("/nonexistant", 0, 0, readdir_cb, "readdir");
      eio_fstat (last_fd, 0, stat_cb, "stat");
      eio_write (last_fd, "test\nfail\n", 10, 4, 0, res_cb, "write");
      event_loop ();

      eio_read (last_fd, 0, 8, 0, EIO_PRI_DEFAULT, read_cb, "read");
      eio_readlink ("eio-test-dir/eio-symlink", 0, res_cb, "readlink");
      event_loop ();

      eio_dup2 (1, 2, EIO_PRI_DEFAULT, res_cb, "dup"); // dup stdout to stderr
      eio_chmod ("eio-test-dir", 0765, 0, res_cb, "chmod");
      eio_ftruncate (last_fd, 9, 0, res_cb, "ftruncate");
      eio_fdatasync (last_fd, 0, res_cb, "fdatasync");
      eio_fsync (last_fd, 0, res_cb, "fsync");
      eio_sync (0, res_cb, "sync");
      eio_busy (0.5, 0, res_cb, "busy");
      event_loop ();

      eio_sendfile (1, last_fd, 4, 5, 0, res_cb, "sendfile"); // write "test\n" to stdout
      eio_fstat (last_fd, 0, stat_cb, "stat");
      event_loop ();

      eio_truncate ("eio-test-dir/eio-test-file", 6, 0, res_cb, "truncate");
      eio_readahead (last_fd, 0, 64, 0, res_cb, "readahead");
      event_loop ();

      eio_close (last_fd, 0, res_cb, "close");
      eio_link ("eio-test-dir/eio-test-file", "eio-test-dir/eio-test-file-2", 0, res_cb, "link");
      event_loop ();

      eio_rename ("eio-test-dir/eio-test-file", "eio-test-dir/eio-test-file-renamed", 0, res_cb, "rename");
      event_loop ();

      eio_unlink ("eio-test-dir/eio-fifo", 0, res_cb, "unlink");
      eio_unlink ("eio-test-dir/eio-symlink", 0, res_cb, "unlink");
      eio_unlink ("eio-test-dir/eio-test-file-2", 0, res_cb, "unlink");
      eio_unlink ("eio-test-dir/eio-test-file-renamed", 0, res_cb, "unlink");
      event_loop ();

      eio_rmdir ("eio-test-dir", 0, res_cb, "rmdir");
      event_loop ();
    }
  while (0);

  return 0;
}