rt/tst-aio7.c

   1 /* Test for AIO POSIX compliance.
   2    Copyright (C) 2001-2021 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    <https://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 #define TEST_FUNCTION do_test ()
  29 static int
  30 do_test (void)
  31 {
  32   int result = 0;
  33   int piped[2];
  34
  35   /* Make a pipe that we will never write to, so we can block reading it.  */
  36   if (pipe (piped) < 0)
  37     {
  38       perror ("pipe");
  39       return 1;
  40     }
  41
  42   /* Test for aio_cancel() detecting invalid file descriptor.  */
  43   {
  44     struct aiocb cb;
  45     int fd = -1;
  46
  47     cb.aio_fildes = fd;
  48     cb.aio_offset = 0;
  49     cb.aio_buf = NULL;
  50     cb.aio_nbytes = 0;
  51     cb.aio_reqprio = 0;
  52     cb.aio_sigevent.sigev_notify = SIGEV_NONE;
  53
  54     errno = 0;
  55
  56     /* Case one: invalid fds that match.  */
  57     if (aio_cancel (fd, &cb) != -1 || errno != EBADF)
  58       {
  59         if (errno == ENOSYS)
  60           {
  61             puts ("no aio support in this configuration");
  62             return 0;
  63           }
  64
  65         puts ("aio_cancel( -1, {-1..} ) did not return -1 or errno != EBADF");
  66         ++result;
  67       }
  68
  69     cb.aio_fildes = -2;
  70     errno = 0;
  71
  72     /* Case two: invalid fds that do not match; just print warning.  */
  73     if (aio_cancel (fd, &cb) != -1 || errno != EBADF)
  74       puts ("aio_cancel( -1, {-2..} ) did not return -1 or errno != EBADF");
  75   }
  76
  77   /* Test for aio_fsync() detecting bad fd.  */
  78   {
  79     struct aiocb cb;
  80     int fd = -1;
  81
  82     cb.aio_fildes = fd;
  83     cb.aio_offset = 0;
  84     cb.aio_buf = NULL;
  85     cb.aio_nbytes = 0;
  86     cb.aio_reqprio = 0;
  87     cb.aio_sigevent.sigev_notify = SIGEV_NONE;
  88
  89     errno = 0;
  90
  91     /* Case one: invalid fd.  */
  92     if (aio_fsync (O_SYNC, &cb) != -1 || errno != EBADF)
  93       {
  94         puts ("aio_fsync( op, {-1..} ) did not return -1 or errno != EBADF");
  95         ++result;
  96       }
  97   }
  98
  99   /* Test for aio_suspend() suspending even if completed elements in list.  */
 100   {
 101 #define BYTES 8
 102     const int ELEMS = 2;
 103     int i, r, fd;
 104     static char buff[BYTES];
 105     char name[] = "/tmp/aio7.XXXXXX";
 106     struct timespec timeout;
 107     static struct aiocb cb0, cb1;
 108     struct aiocb *list[ELEMS];
 109
 110     fd = mkstemp (name);
 111     if (fd < 0)
 112       error (1, errno, "creating temp file");
 113
 114     if (unlink (name))
 115       error (1, errno, "unlinking temp file");
 116
 117     if (write (fd, "01234567", BYTES) != BYTES)
 118       error (1, errno, "writing to temp file");
 119
 120     cb0.aio_fildes = fd;
 121     cb0.aio_offset = 0;
 122     cb0.aio_buf = buff;
 123     cb0.aio_nbytes = BYTES;
 124     cb0.aio_reqprio = 0;
 125     cb0.aio_sigevent.sigev_notify = SIGEV_NONE;
 126
 127     r = aio_read (&cb0);
 128     if (r != 0)
 129       error (1, errno, "reading from file");
 130
 131     while (aio_error (&(cb0)) == EINPROGRESS)
 132       usleep (10);
 133
 134     for (i = 0; i < BYTES; i++)
 135       printf ("%c ", buff[i]);
 136     printf ("\n");
 137
 138     /* At this point, the first read is completed, so start another one on
 139        the read half of a pipe on which nothing will be written.  */
 140     cb1.aio_fildes = piped[0];
 141     cb1.aio_offset = 0;
 142     cb1.aio_buf = buff;
 143     cb1.aio_nbytes = BYTES;
 144     cb1.aio_reqprio = 0;
 145     cb1.aio_sigevent.sigev_notify = SIGEV_NONE;
 146
 147     r = aio_read (&cb1);
 148     if (r != 0)
 149       error (1, errno, "reading from file");
 150
 151     /* Now call aio_suspend() with the two reads.  It should return
 152      * immediately according to the POSIX spec.
 153      */
 154     list[0] = &cb0;
 155     list[1] = &cb1;
 156     timeout.tv_sec = 3;
 157     timeout.tv_nsec = 0;
 158     r = aio_suspend ((const struct aiocb * const *) list, ELEMS, &timeout);
 159
 160     if (r == -1 && errno == EAGAIN)
 161       {
 162         puts ("aio_suspend([done,blocked],2,3) suspended thread");
 163         ++result;
 164       }
 165
 166     /* Note that CB1 is still pending, and so cannot be an auto variable.
 167        Thus we also test that exiting with an outstanding request works.  */
 168   }
 169
 170   return result;
 171 }
 172
 173 #include "../test-skeleton.c"