glibc/rt/tst-aio7.c

/* Test for AIO POSIX compliance.
   Copyright (C) 2001-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <aio.h>
#include <error.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>


#define TEST_FUNCTION do_test ()
static int
do_test (void)
{
  int result = 0;
  int piped[2];

  /* Make a pipe that we will never write to, so we can block reading it.  */
  if (pipe (piped) < 0)
    {
      perror ("pipe");
      return 1;
    }

  /* Test for aio_cancel() detecting invalid file descriptor.  */
  {
    struct aiocb cb;
    int fd = -1;

    cb.aio_fildes = fd;
    cb.aio_offset = 0;
    cb.aio_buf = NULL;
    cb.aio_nbytes = 0;
    cb.aio_reqprio = 0;
    cb.aio_sigevent.sigev_notify = SIGEV_NONE;

    errno = 0;

    /* Case one: invalid fds that match.  */
    if (aio_cancel (fd, &cb) != -1 || errno != EBADF)
      {
	if (errno == ENOSYS)
	  {
	    puts ("no aio support in this configuration");
	    return 0;
	  }

	puts ("aio_cancel( -1, {-1..} ) did not return -1 or errno != EBADF");
	++result;
      }

    cb.aio_fildes = -2;
    errno = 0;

    /* Case two: invalid fds that do not match; just print warning.  */
    if (aio_cancel (fd, &cb) != -1 || errno != EBADF)
      puts ("aio_cancel( -1, {-2..} ) did not return -1 or errno != EBADF");
  }

  /* Test for aio_fsync() detecting bad fd.  */
  {
    struct aiocb cb;
    int fd = -1;

    cb.aio_fildes = fd;
    cb.aio_offset = 0;
    cb.aio_buf = NULL;
    cb.aio_nbytes = 0;
    cb.aio_reqprio = 0;
    cb.aio_sigevent.sigev_notify = SIGEV_NONE;

    errno = 0;

    /* Case one: invalid fd.  */
    if (aio_fsync (O_SYNC, &cb) != -1 || errno != EBADF)
      {
	puts ("aio_fsync( op, {-1..} ) did not return -1 or errno != EBADF");
	++result;
      }
  }

  /* Test for aio_suspend() suspending even if completed elements in list.  */
  {
#define BYTES 8
    const int ELEMS = 2;
    int i, r, fd;
    static char buff[BYTES];
    char name[] = "/tmp/aio7.XXXXXX";
    struct timespec timeout;
    static struct aiocb cb0, cb1;
    struct aiocb *list[ELEMS];

    fd = mkstemp (name);
    if (fd < 0)
      error (1, errno, "creating temp file");

    if (unlink (name))
      error (1, errno, "unlinking temp file");

    if (write (fd, "01234567", BYTES) != BYTES)
      error (1, errno, "writing to temp file");

    cb0.aio_fildes = fd;
    cb0.aio_offset = 0;
    cb0.aio_buf = buff;
    cb0.aio_nbytes = BYTES;
    cb0.aio_reqprio = 0;
    cb0.aio_sigevent.sigev_notify = SIGEV_NONE;

    r = aio_read (&cb0);
    if (r != 0)
      error (1, errno, "reading from file");

    while (aio_error (&(cb0)) == EINPROGRESS)
      usleep (10);

    for (i = 0; i < BYTES; i++)
      printf ("%c ", buff[i]);
    printf ("\n");

    /* At this point, the first read is completed, so start another one on
       the read half of a pipe on which nothing will be written.  */
    cb1.aio_fildes = piped[0];
    cb1.aio_offset = 0;
    cb1.aio_buf = buff;
    cb1.aio_nbytes = BYTES;
    cb1.aio_reqprio = 0;
    cb1.aio_sigevent.sigev_notify = SIGEV_NONE;

    r = aio_read (&cb1);
    if (r != 0)
      error (1, errno, "reading from file");

    /* Now call aio_suspend() with the two reads.  It should return
     * immediately according to the POSIX spec.
     */
    list[0] = &cb0;
    list[1] = &cb1;
    timeout.tv_sec = 3;
    timeout.tv_nsec = 0;
    r = aio_suspend ((const struct aiocb * const *) list, ELEMS, &timeout);

    if (r == -1 && errno == EAGAIN)
      {
	puts ("aio_suspend([done,blocked],2,3) suspended thread");
	++result;
      }

    /* Note that CB1 is still pending, and so cannot be an auto variable.
       Thus we also test that exiting with an outstanding request works.  */
  }

  return result;
}

#include "../test-skeleton.c"