2.6.37.6 2.6.38.2 tst-aio4.c

From: Klaus Dittrich
Date: Mon Mar 28 2011 - 13:18:02 EST


With both kernels, 2.6.37.6 and 2.6.38.2 tst-aio4.c of glibc fails.

It successfully completes with 2.6.37.5 and 2.6.38.1 and before.

I appended the code for convinice.

/* Test for completion signal handling.
Copyright (C) 2000,01,02 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */

#include <aio.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

/* We might need a bit longer timeout. */
#define TIMEOUT 10 /* sec */

int my_signo;

volatile sig_atomic_t flag;


static void
sighandler (const int signo)
{
flag = signo;
printf ("signo = %d\n",signo);
}

static int
wait_flag (void)
{
while (flag == 0)
{
puts ("Sleeping...");
sleep (1);
}

if (flag != my_signo)
{
printf ("signal handler received wrong signal, flag is %d\n", flag);
return 1;
}

return 0;
}

#ifndef SIGRTMIN
# define SIGRTMIN -1
# define SIGRTMAX -1
#endif

static int
do_test (int argc, char *argv[])
{
char name[] = "/tmp/aio4.XXXXXX";
int fd;
struct aiocb *arr[1];
struct aiocb cb;
static const char buf[] = "Hello World\n";
struct aioinit init = {10, 20, 0};
struct sigaction sa;
struct sigevent ev;

if (SIGRTMIN == -1)
{
printf ("RT signals not supported.\n");
return 0;
}

/* Select a signal from the middle of the available choices... */
my_signo = (SIGRTMAX + SIGRTMIN) / 2;

fd = mkstemp (name);
if (fd == -1)
{
printf ("cannot open temp name: %m\n");
return 1;
}

unlink (name);

/* Test also aio_init. */
aio_init (&init);

arr[0] = &cb;

cb.aio_fildes = fd;
cb.aio_lio_opcode = LIO_WRITE;
cb.aio_reqprio = 0;
cb.aio_buf = (void *) buf;
cb.aio_nbytes = sizeof (buf) - 1;
cb.aio_offset = 0;
cb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
cb.aio_sigevent.sigev_notify_function = NULL;
cb.aio_sigevent.sigev_notify_attributes = NULL;
cb.aio_sigevent.sigev_signo = my_signo;
cb.aio_sigevent.sigev_value.sival_ptr = NULL;

ev.sigev_notify = SIGEV_SIGNAL;
ev.sigev_notify_function = NULL;
ev.sigev_notify_attributes = NULL;
ev.sigev_signo = my_signo;

sa.sa_handler = sighandler;
sigemptyset (&sa.sa_mask);
sa.sa_flags = SA_RESTART;

if (sigaction (my_signo, &sa, NULL) < 0)
{
printf ("sigaction failed: %m\n");
return 1;
}

flag = 0;
/* First use aio_write. */
if (aio_write (arr[0]) < 0)
{
if (errno == ENOSYS)
{
puts ("no aio support in this configuration");
return 0;
}
printf ("aio_write failed: %m\n");
return 1;
}

if (wait_flag ())
return 1;

puts ("aio_write OK");

flag = 0;
/* Again with lio_listio. */
if (lio_listio (LIO_NOWAIT, arr, 1, &ev) < 0)
{
printf ("lio_listio failed: %m\n");
return 1;
}

if (wait_flag ())
return 1;

puts ("all OK");

return 0;
}

int main(int argc, char *argv[]) {
do_test (argc, argv);
}