dup03.c

cygwin, 著名的在win32下模拟unix操作系统的东东

/*
 * 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: dup03.c,v 1.1 2001/09/09 13:38:16 duda Exp $ */
/**********************************************************
 * 
 *    OS Test - Silicon Graphics, Inc.
 * 
 *    TEST IDENTIFIER	: dup03
 * 
 *    EXECUTED BY	: anyone
 * 
 *    TEST TITLE	: Negative test for dup(2) (too many fds)
 * 
 *    PARENT DOCUMENT	: usctpl01
 * 
 *    TEST CASE TOTAL	: 1
 * 
 *    WALL CLOCK TIME	: 1
 * 
 *    CPU TYPES		: ALL
 * 
 *    AUTHOR		: Richard Logan
 * 
 *    CO-PILOT		: William Roske
 * 
 *    DATE STARTED	: 06/94
 * 
 *    INITIAL RELEASE	: UNICOS 7.0
 * 
 *    TEST CASES
 * 
 * 	1.) dup(2) returns...(See Description)
 *	
 *    INPUT SPECIFICATIONS
 * 	The standard options for system call tests are accepted.
 *	(See the parse_opts(3) man page).
 * 
 *    OUTPUT SPECIFICATIONS
 * 	
 *    DURATION
 * 	Terminates - with frequency and infinite modes.
 * 
 *    SIGNALS
 * 	Uses SIGUSR1 to pause before test if option set.
 * 	(See the parse_opts(3) man page).
 *
 *    RESOURCES
 * 	None
 * 
 *    ENVIRONMENTAL NEEDS
 *      No run-time environmental needs.
 * 
 *    SPECIAL PROCEDURAL REQUIREMENTS
 * 	None
 * 
 *    INTERCASE DEPENDENCIES
 * 	None
 * 
 *    DETAILED DESCRIPTION
 * 
 * 	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 <sys/types.h>
#include <sys/fcntl.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include "test.h"
#include "usctest.h"

void setup();
void cleanup();

char *TCID="dup03"; 		/* Test program identifier.    */
int TST_TOTAL=1;    		/* Total number of test cases. */
extern int Tst_count;		/* Test Case counter for tst_* routines */


char Fname[255];
int *Fd = NULL;
int Nfds=0;

/***********************************************************************
 * Main
 ***********************************************************************/
int
main(int ac, char **av)
{
    int lc;		/* loop counter */
    const char *msg;		/* message returned from parse_opts */
    
    /***************************************************************
     * 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();

    /***************************************************************
     * 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;

	/* 
	 * Call dup(2)
	 */
	TEST( dup(Fd[0]) );
	
        /* check return code */
        if ( TEST_RETURN == -1 ) {
            if ( STD_FUNCTIONAL_TEST ) {
                if ( TEST_ERRNO == EMFILE ) {
                    tst_resm(TPASS, "dup(%d) Failed, errno=%d : %s", Fd[0],
                        TEST_ERRNO, strerror(TEST_ERRNO));
		}
                else {
                    tst_resm(TFAIL, "dup(%d) Failed, errno=%d %s, expected %d (EMFILE)",
                        Fd[0], TEST_ERRNO, strerror(TEST_ERRNO), EMFILE);
		}
            }
        } else {
            tst_resm(TFAIL, "dup(%d) returned %d, expected -1, errno:%d (EMFILE)",
                Fd[0], TEST_RETURN, EMFILE);

            /* close the new file so loops do not open too many files */
            if (close(TEST_RETURN) == -1) {
               tst_brkm(TBROK, cleanup, "close(%s) Failed, errno=%d : %s",
                    Fname, errno, strerror(errno));
            }
        }

    }	/* End for TEST_LOOPING */

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

    return 0;
}	/* End main */

/***************************************************************
 * setup() - performs all ONE TIME setup for this test.
 ***************************************************************/
void 
setup()
{
    long maxfds;

    /*
     * Initialize Fd in case we get a quick signal
     */
    maxfds = sysconf(_SC_OPEN_MAX);
    if (maxfds < 1) {
	tst_brkm(TBROK, cleanup,
	    		"sysconf(_SC_OPEN_MAX) Failed, errno=%d : %s",
	    		errno, strerror(errno));
    }
    
    Fd = (int *)malloc(maxfds*sizeof(int));
    Fd[0]=-1;

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

    /* make a temp directory and cd to it */
    tst_tmpdir();

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

    /*
     * open the file as many times as it takes to use up all fds
     */
    sprintf(Fname, "dupfile");
    for (Nfds=1; Nfds<=maxfds; Nfds++) {
        if ((Fd[Nfds-1] = open(Fname,O_RDWR|O_CREAT,0700)) == -1) {

	    Nfds--;	/* on a open failure, decrement the counter */
	    if ( errno == EMFILE ) {
		break;
	    }
	    else { 	/* open failed for some other reason */
	        tst_brkm(TBROK, cleanup,
		    "open(%s, O_RDWR|O_CREAT,0700) Failed, errno=%d : %s",
		    Fname, errno, strerror(errno));
	    }
	}
    }

    /*
     * make sure at least one was open and that all fds were opened.
     */
    if ( Nfds == 0 ) {
	tst_brkm(TBROK, cleanup, "Unable to open at least one file");
    }
    if ( Nfds > maxfds ) {
	tst_brkm(TBROK, cleanup,
	    "Unable to open enough files to use all file descriptors, tried %d",
	    maxfds);
    }
}	/* 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;

    /* close the open file we've been dup'ing */
    if (Fd) {
    	for (; Nfds >0 ; Nfds--) {
    	    if (close(Fd[Nfds-1]) == -1) {
		tst_resm(TWARN, "close(%s) Failed, errno=%d : %s",
				Fname, errno, strerror(errno));
	    }
	    Fd[Nfds]=-1;
	}
	free(Fd);
    }

    /* Remove tmp dir and all files in it */
    tst_rmdir();

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