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Adding a simple brk() test that has been sitting around for a while.

/*
 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * 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.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */
/* $Id: brk01.c,v 1.1 2001/04/04 20:49:46 nstraz Exp $ */
/**********************************************************
 * 
 *    OS Test - Silicon Graphics, Inc.
 * 
 *    TEST IDENTIFIER	: brk01
 * 
 *    EXECUTED BY	: anyone
 * 
 *    TEST TITLE	: Basic test for brk(2)
 * 
 *    PARENT DOCUMENT	: usctpl01
 * 
 *    TEST CASE TOTAL	: 1
 * 
 *    WALL CLOCK TIME	: 1
 * 
 *    CPU TYPES		: ALL
 * 
 *    AUTHOR		: William Roske
 * 
 *    CO-PILOT		: Dave Fenner
 * 
 *    DATE STARTED	: 03/30/92
 * 
 *    INITIAL RELEASE	: UNICOS 7.0
 * 
 *    TEST CASES
 * 
 * 	1.) brk(2) returns...(See Description)
 *	
 *    INPUT SPECIFICATIONS
 * 	The standard options for system call tests are accepted.
 *	(See the parse_opts(3) man page).
 * 
 *    OUTPUT SPECIFICATIONS
 * 	
 *    ENVIRONMENTAL NEEDS
 * 	The libcuts.a and libsys.a libraries must be included in 
 *	the compilation of this test.
 * 
 *    SPECIAL PROCEDURAL REQUIREMENTS
 * 	None
 * 
 *    DETAILED DESCRIPTION
 *	This is a Phase I test for the brk(2) system call.  It is intended
 *	to provide a limited exposure of the system call, for now.  It
 *	should/will be extended when full functional tests are written for
 *	brk(2).
 * 
 * 	Setup:
 * 	  Setup signal handling.
 *	  Pause for SIGUSR1 if option specified.
 * 
 * 	Test:
 *	 Loop if the proper options are given.
 * 	  Execute system call
 *	  Check return code, if system call failed (return=-1)
 *		Log the errno and Issue a FAIL message.
 *	  Otherwise, Issue a PASS message.
 * 
 * 	Cleanup:
 * 	  Print errno log and/or timing stats if options given
 * 
 * 
 *#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#**/

#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/param.h>
#include <sys/resource.h>

#include "test.h"
#include "usctest.h"

#ifndef BSIZE
#define BSIZE  BBSIZE
#endif

void setup();
void cleanup();


#define MAX_SIZE_LC	1000	/* loop count test will reach max size */

char *TCID="brk01"; 		/* Test program identifier.    */
int TST_TOTAL=1;    		/* Total number of test cases. */
extern int Tst_count;		/* Test Case counter for tst_* routines */

long Max_brk_byte_size;
long Beg_brk_val;

/***********************************************************************
 * MAIN
 ***********************************************************************/
int
main(int ac, char **av)
{
    int lc;		/* loop counter */
    char *msg;		/* message returned from parse_opts */
    int incr;		/* increment */
    long nbrkpt;		/* new brk point value */
    long cur_brk_val;	/* current size returned by sbrk */
    long aft_brk_val;	/* current size returned by sbrk */

    /***************************************************************
     * parse standard options
     ***************************************************************/
    if ( (msg=parse_opts(ac, av, (option_t *) NULL, NULL)) != (char *) NULL ) {
	tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
	tst_exit();
    }

    /***************************************************************
     * perform global setup for test
     ***************************************************************/
    setup();

    /*
     * Attempt to control how fast we get to test max size.
     * Every MAX_SIZE_LC'th lc will be fastest test will reach max size.
     */
    incr = (Max_brk_byte_size - Beg_brk_val)/(MAX_SIZE_LC/2);

    if ( (incr * 2) < 4096 )	/* make sure that process will grow */
	incr += 4096/2;	

    /***************************************************************
     * check looping state if -c option given
     ***************************************************************/
    for (lc=0; TEST_LOOPING(lc); lc++) {

	/* reset Tst_count in case we are looping. */
	Tst_count=0;

	/*
	 * Determine new value to give brk
	 * Every even lc value, grow by 2 incr and
	 * every odd lc value, strink by one incr.
	 * If lc is equal to 3, no change, special case.
	 */
	cur_brk_val=(long)sbrk(0);
	if ( lc == 3 ) {
	    nbrkpt = cur_brk_val;	/* no change, special one time case */
	}
	else if ( (lc % 2) == 0 ) {
	    /*
	     * grow
	     */
	    nbrkpt = cur_brk_val + (2 * incr);

	    if ( nbrkpt > Max_brk_byte_size )
	        nbrkpt=Beg_brk_val;	/* start over */

	}
	else {
	    /*
	     * shrink
	     */
	    nbrkpt = cur_brk_val - incr;
	}

/****
    printf("cur_brk_val = %d, nbrkpt = %d, incr = %d, lc = %d\n",
	cur_brk_val, nbrkpt, incr, lc);
****/

	/* 
	 * Call brk(2)
	 */
	TEST(brk((char *)nbrkpt));
	
	/* check return code */
	if ( TEST_RETURN == -1 ) {

	    aft_brk_val=(long)sbrk(0);
	    tst_resm(TFAIL,
		"brk(%d) Failed, errno=%d : %s\n size before %d, after %d",
		nbrkpt, TEST_ERRNO, strerror(TEST_ERRNO), cur_brk_val,
		aft_brk_val);

	} else {

	    /***************************************************************
	     * only perform functional verification if flag set (-f not given)
	     ***************************************************************/
	    if ( STD_FUNCTIONAL_TEST ) {

		aft_brk_val=(long)sbrk(0);
		if ( aft_brk_val == nbrkpt ) {
		
		    tst_resm(TPASS,
			"brk(%d) returned %d, new size verified by sbrk",
		        nbrkpt, TEST_RETURN);
		}
		else {
		    tst_resm(TFAIL,
			"brk(%d) returned %d, sbrk before %d, after %d",
		        nbrkpt, TEST_RETURN, cur_brk_val, aft_brk_val);
		}
	    } 
	}

    }	/* End for TEST_LOOPING */

    /***************************************************************
     * cleanup and exit
     ***************************************************************/
    cleanup();

    return 0;
}	/* End main */

/***************************************************************
 * setup() - performs all ONE TIME setup for this test.
 ***************************************************************/
void 
setup()
{
    unsigned long max_size;
    int ncpus;
    unsigned long ulim_sz;
    unsigned long usr_mem_sz;
    struct rlimit lim;

    /* capture signals */
    tst_sig(NOFORK, DEF_HANDLER, cleanup);

    /*if ((ulim_sz=ulimit(3,0)) == -1)
	tst_brkm(TBROK, cleanup, "ulimit(3,0) Failed, errno=%d : %s",
	    errno, strerror(errno));*/

    if (getrlimit(RLIMIT_DATA,&lim) == -1)
	tst_brkm(TBROK, cleanup, "getrlimit(RLIMIT_DATA,0x%lld) Failed, errno=%d : %s",
	    (void*)&lim,errno, strerror(errno));
    ulim_sz = lim.rlim_cur;

#ifdef CRAY
    if ((usr_mem_sz=sysconf(_SC_CRAY_USRMEM)) == -1)
	tst_brkm(TBROK, cleanup, "sysconf(_SC_CRAY_USRMEM) Failed, errno=%d : %s",
	    errno, strerror(errno));

    usr_mem_sz *= 8;	/* convert to bytes */
#else
    /* 
     * On IRIX, which is a demand paged system, memory is managed
     * different than on Crays systems.  For now, pick some value.
     */
    usr_mem_sz = 1024 * 1024 * sizeof(long);
#endif


#ifdef linux
#define _SC_NPROC_ONLN _SC_NPROCESSORS_ONLN
#endif
    if ((ncpus=sysconf(_SC_NPROC_ONLN)) == -1)
	tst_brkm(TBROK, cleanup, 
	    "sysconf(_SC_NPROC_ONLN) Failed, errno=%d : %s",
	    errno, strerror(errno));

    /*
     * allow 2*ncpus copies to run.
     * never attempt to take more than a * 1/4 of memory (by single test)
     */

    if ( ulim_sz < usr_mem_sz )
	max_size = ulim_sz;
    else
	max_size = usr_mem_sz;

    max_size = max_size / (2 * ncpus); 

    if ( max_size > (usr_mem_sz/4) )
	max_size = usr_mem_sz/4;	/* only fourth mem by single test */

    Beg_brk_val=(long)sbrk(0);

    /*
     * allow at least 4 times a big as current.
     * This will override above code.
     */
    if ( max_size < Beg_brk_val*4 )	/* running on small mem and/or high # cpus */
	max_size = Beg_brk_val*4;	

    Max_brk_byte_size = max_size;

    /* Pause if that option was specified */
    TEST_PAUSE;


}	/* End setup() */


/***************************************************************
 * cleanup() - performs all ONE TIME cleanup for this test at
 *		completion or premature exit.
 ***************************************************************/
void 
cleanup()
{
    /*
     * print timing stats if that option was specified.
     * print errno log if that option was specified.
     */
    TEST_CLEANUP;

    /* exit with return code appropriate for results */
    tst_exit();

}	/* End cleanup() */