/*
* Copyright (c) 2005, Bull S.A..  All rights reserved.
* Created by: Sebastien Decugis

* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.


* This sample test aims to check the following assertion:
*
*  sem_unlink will return -1 and set errno to ENAMETOOLONG when the semaphore
* name length is greater than PATH_MAX or a component length is greater than
* NAME_MAX.

* The steps are:
* -> If PATH_MAX is positive,
*    -> create a semaphore with a name bigger than PATH_MAX.
*    -> if the creation succeeds, try to unlink. It should fail.
* -> If NAME_MAX is positive, do similar test.

* The test fails if the ENAMETOOLONG is not returned.
* It also FAILS if this error is returned, as it means we can create a semaphore
* which cannot be removed.
* So actually, if the creation succeeds, the test fails :))

*/

/* We are testing conformance to IEEE Std 1003.1, 2003 Edition */
#define _POSIX_C_SOURCE 200112L

/******************************************************************************/
/*************************** standard includes ********************************/
/******************************************************************************/
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <semaphore.h>
#include <errno.h>
#include <fcntl.h>

/******************************************************************************/
/***************************   Test framework   *******************************/
/******************************************************************************/
#include "testfrmw.h"
#include "testfrmw.c" 
/* This header is responsible for defining the following macros:
 * UNRESOLVED(ret, descr);  
 *    where descr is a description of the error and ret is an int 
 *   (error code for example)
 * FAILED(descr);
 *    where descr is a short text saying why the test has failed.
 * PASSED();
 *    No parameter.
 * 
 * Both three macros shall terminate the calling process.
 * The testcase shall not terminate in any other maneer.
 * 
 * The other file defines the functions
 * void output_init()
 * void output(char * string, ...)
 * 
 * Those may be used to output information.
 */

/******************************************************************************/
/**************************** Configuration ***********************************/
/******************************************************************************/
#ifndef VERBOSE
#define VERBOSE 1
#endif

#define SEM_NAME  "/sem_unlink_5_1"

/******************************************************************************/
/***************************    Test case   ***********************************/
/******************************************************************************/

/* The main test function. */
int main( int argc, char * argv[] )
{
	int ret, error;
	sem_t * sem;
	long PATH_MAX, NAME_MAX;
	char * sem_name;

	/* Initialize output */
	output_init();

	/* Get PATH_MAX value */
	PATH_MAX = pathconf( "/", _PC_PATH_MAX );

#if VERBOSE > 0
	output( "PATH_MAX: %ld\n", PATH_MAX );
#endif

	if ( PATH_MAX > 0 )
	{
		/* create a semaphore with a name longer than PATH_MAX */
		sem_name = calloc( PATH_MAX + 1, sizeof( char ) );

		if ( sem_name == NULL )
		{
			UNRESOLVED( errno, "Failed to allocate space for the semaphore name" );
		}

		/* the space was allocated */
		sem_name[ 0 ] = '/';

		sem_name[ PATH_MAX ] = '\0';

		memset( sem_name + 1, 'P', PATH_MAX - 1 );

		/* Create the semaphore */
		sem = sem_open( sem_name, O_CREAT, 0777, 1 );

		if ( sem != SEM_FAILED )
		{
			ret = sem_unlink( sem_name );
			error = errno;
			free( sem_name );

			if ( ret == 0 )
			{
				FAILED( "The function did not return ENAMETOOLONG as expected" );
			}
			else
			{
				output( "Error was %d: %s\n", error, strerror( error ) );
				FAILED( "Unable to unlink a semaphore which we just created" );
			}
		}

#if VERBOSE > 0
		else
		{
			output( "Creation of the semaphore failed with error %d: %s\n", errno, strerror( errno ) );
		}

#endif

	}

	/* Get NAME_MAX value */
	NAME_MAX = pathconf( "/", _PC_NAME_MAX );

#if VERBOSE > 0
	output( "NAME_MAX: %ld\n", NAME_MAX );

#endif

	if ( NAME_MAX > 0 )
	{
		/* create a semaphore with a name longer than NAME_MAX */
		sem_name = calloc( NAME_MAX + 2, sizeof( char ) );

		if ( sem_name == NULL )
		{
			UNRESOLVED( errno, "Failed to allocate space for the semaphore name" );
		}

		/* the space was allocated */
		sem_name[ 0 ] = '/';

		sem_name[ NAME_MAX + 1 ] = '\0';

		memset( sem_name + 1, 'N', NAME_MAX );

		/* Create the semaphore */
		sem = sem_open( sem_name, O_CREAT , 0777, 1 );

		if ( sem != SEM_FAILED )
		{
			ret = sem_unlink( sem_name );
			error = errno;
			free( sem_name );

			if ( ret == 0 )
			{
				FAILED( "The function did not return ENAMETOOLONG as expected" );
			}
			else
			{
				output( "Error was %d: %s\n", error, strerror( error ) );
				FAILED( "Unable to unlink a semaphore which we just created" );
			}
		}

#if VERBOSE > 0
		else
		{
			output( "Creation of the semaphore failed with error %d: %s\n", errno, strerror( errno ) );
		}

#endif

	}

	/* Test passed */
#if VERBOSE > 0
	output( "Test passed\n" );

#endif
	PASSED;
}