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/*
* Copyright (c) Abraham vd Merwe <abz@blio.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of other contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <signal.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <debug/log.h>
#include <debug/memory.h>
#include <abz/error.h>
#include <abz/unblock.h>
static void fail (const char *fmt, ...)
{
va_list ap;
va_start (ap,fmt);
if (fmt != NULL) log_vprintf (LOG_ERROR,fmt,ap);
va_end (ap);
exit (EXIT_FAILURE);
}
static const char filename[] = "test_unblock.fifo";
static int fd;
static void ignore (int sig)
{
log_printf (LOG_NORMAL,"back again. seems to be working\n");
close (fd);
unlink (filename);
exit (EXIT_SUCCESS);
}
int main (void)
{
char buf[1024];
ssize_t result;
mem_open (NULL);
log_open (NULL,LOG_NOISY,LOG_HAVE_COLORS | LOG_PRINT_FUNCTION);
atexit (mem_close);
atexit (log_close);
unlink (filename);
if ((fd = mkfifo (filename,0644)) < 0)
fail ("failed to create %s: %m\n",filename);
log_printf (LOG_NORMAL,"entering non-blocking mode\n");
if (unblock (fd))
{
close (fd);
fail ("%s\n",abz_get_error ());
}
result = read (fd,buf,sizeof (buf));
log_printf (LOG_NORMAL,"back again. result=%d, errno=%d (EAGAIN=%d)\n",result,errno,EAGAIN);
log_printf (LOG_NORMAL,"entering blocking mode\n");
if (block (fd))
{
close (fd);
fail ("%s\n",abz_get_error ());
}
signal (SIGALRM,ignore);
alarm (5);
result = read (fd,buf,sizeof (buf));
log_printf (LOG_ERROR,"read returned: result=%d, errno=%u (%m)\n",result,errno);
close (fd);
unlink (filename);
exit (EXIT_FAILURE);
}
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