rt/tst-aio7.c

   1 /* Test for AIO POSIX compliance.
   2    Copyright (C) 2001-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <aio.h>
  20 #include <error.h>
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26
  27
  28 /* We might wait for 3 seconds, so increase timeout to 10 seconds.  */
  29 #define TIMEOUT 10
  30
  31
  32 #define TEST_FUNCTION do_test ()
  33 static int
  34 do_test (void)
  35 {
  36   int result = 0;
  37   int piped[2];
  38
  39   /* Make a pipe that we will never write to, so we can block reading it.  */
  40   if (pipe (piped) < 0)
  41     {
  42       perror ("pipe");
  43       return 1;
  44     }
  45
  46   /* Test for aio_cancel() detecting invalid file descriptor.  */
  47   {
  48     struct aiocb cb;
  49     int fd = -1;
  50
  51     cb.aio_fildes = fd;
  52     cb.aio_offset = 0;
  53     cb.aio_buf = NULL;
  54     cb.aio_nbytes = 0;
  55     cb.aio_reqprio = 0;
  56     cb.aio_sigevent.sigev_notify = SIGEV_NONE;
  57
  58     errno = 0;
  59
  60     /* Case one: invalid fds that match.  */
  61     if (aio_cancel (fd, &cb) != -1 || errno != EBADF)
  62       {
  63         if (errno == ENOSYS)
  64           {
  65             puts ("no aio support in this configuration");
  66             return 0;
  67           }
  68
  69         puts ("aio_cancel( -1, {-1..} ) did not return -1 or errno != EBADF");
  70         ++result;
  71       }
  72
  73     cb.aio_fildes = -2;
  74     errno = 0;
  75
  76     /* Case two: invalid fds that do not match; just print warning.  */
  77     if (aio_cancel (fd, &cb) != -1 || errno != EBADF)
  78       puts ("aio_cancel( -1, {-2..} ) did not return -1 or errno != EBADF");
  79   }
  80
  81   /* Test for aio_fsync() detecting bad fd.  */
  82   {
  83     struct aiocb cb;
  84     int fd = -1;
  85
  86     cb.aio_fildes = fd;
  87     cb.aio_offset = 0;
  88     cb.aio_buf = NULL;
  89     cb.aio_nbytes = 0;
  90     cb.aio_reqprio = 0;
  91     cb.aio_sigevent.sigev_notify = SIGEV_NONE;
  92
  93     errno = 0;
  94
  95     /* Case one: invalid fd.  */
  96     if (aio_fsync (O_SYNC, &cb) != -1 || errno != EBADF)
  97       {
  98         puts ("aio_fsync( op, {-1..} ) did not return -1 or errno != EBADF");
  99         ++result;
 100       }
 101   }
 102
 103   /* Test for aio_suspend() suspending even if completed elements in list.  */
 104   {
 105 #define BYTES 8
 106     const int ELEMS = 2;
 107     int i, r, fd;
 108     static char buff[BYTES];
 109     char name[] = "/tmp/aio7.XXXXXX";
 110     struct timespec timeout;
 111     static struct aiocb cb0, cb1;
 112     struct aiocb *list[ELEMS];
 113
 114     fd = mkstemp (name);
 115     if (fd < 0)
 116       error (1, errno, "creating temp file");
 117
 118     if (unlink (name))
 119       error (1, errno, "unlinking temp file");
 120
 121     if (write (fd, "01234567", BYTES) != BYTES)
 122       error (1, errno, "writing to temp file");
 123
 124     cb0.aio_fildes = fd;
 125     cb0.aio_offset = 0;
 126     cb0.aio_buf = buff;
 127     cb0.aio_nbytes = BYTES;
 128     cb0.aio_reqprio = 0;
 129     cb0.aio_sigevent.sigev_notify = SIGEV_NONE;
 130
 131     r = aio_read (&cb0);
 132     if (r != 0)
 133       error (1, errno, "reading from file");
 134
 135     while (aio_error (&(cb0)) == EINPROGRESS)
 136       usleep (10);
 137
 138     for (i = 0; i < BYTES; i++)
 139       printf ("%c ", buff[i]);
 140     printf ("\n");
 141
 142     /* At this point, the first read is completed, so start another one on
 143        the read half of a pipe on which nothing will be written.  */
 144     cb1.aio_fildes = piped[0];
 145     cb1.aio_offset = 0;
 146     cb1.aio_buf = buff;
 147     cb1.aio_nbytes = BYTES;
 148     cb1.aio_reqprio = 0;
 149     cb1.aio_sigevent.sigev_notify = SIGEV_NONE;
 150
 151     r = aio_read (&cb1);
 152     if (r != 0)
 153       error (1, errno, "reading from file");
 154
 155     /* Now call aio_suspend() with the two reads.  It should return
 156      * immediately according to the POSIX spec.
 157      */
 158     list[0] = &cb0;
 159     list[1] = &cb1;
 160     timeout.tv_sec = 3;
 161     timeout.tv_nsec = 0;
 162     r = aio_suspend ((const struct aiocb * const *) list, ELEMS, &timeout);
 163
 164     if (r == -1 && errno == EAGAIN)
 165       {
 166         puts ("aio_suspend([done,blocked],2,3) suspended thread");
 167         ++result;
 168       }
 169
 170     /* Note that CB1 is still pending, and so cannot be an auto variable.
 171        Thus we also test that exiting with an outstanding request works.  */
 172   }
 173
 174   return result;
 175 }
 176
 177 #include "../test-skeleton.c"