fcntl07.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: fcntl07.c,v 1.2 2000/09/06 14:21:53 duda Exp $ */
/**********************************************************
 * 
 *    OS Test - Silicon Graphics, Inc.
 * 
 *    TEST IDENTIFIER	: fcntl07
 * 
 *    EXECUTED BY	: anyone
 * 
 *    TEST TITLE	: Close-On-Exec functional test
 * 
 *    PARENT DOCUMENT	: none
 * 
 *    TEST CASE TOTAL	: 2
 * 
 *    WALL CLOCK TIME	: 5
 * 
 *    CPU TYPES		: ALL
 * 
 *    AUTHOR		: Glen Overby
 * 
 *    CO-PILOT		: William Roske
 * 
 *    DATE STARTED	: 08/11/93
 * 
 *    INITIAL RELEASE	: UNICOS 7.0
 * 
 *    TEST CASES
 * 
 * 	1.) test close-on-exec with a regular file
 * 	2.) test close-on-exec with a system pipe
 * 
 *    INPUT SPECIFICATIONS
 *	
 *	Standard arguments accepted by parse_opts(3).
 *
 *	The -t (timing) and -e options apply to the fcntl(.., F_SETFD, ..)
 *	system call.
 *
 *	-T fd	  : If this option is given, the program runs as "test_open",
 *		    testing <fd> to see if it is open or not and exiting
 *		    accordingly:
 *			0	not open (EBADF from fcntl(..., F_GETFD, ...))
 *			3	no error from fcntl
 *			errno	fcntl returned an error other than EBADF
 *
 *	-F name   : File to open.  Must be an absolute path
 *		    and the file must be writable;
 *	-n program: path to the 'test_open' program
 *
 *    OUTPUT SPECIFICATIONS
 *        This test uses the cuts-style test_res format output consisting of:
 *
 *                 test-name   PASS/FAIL/BROK	message
 *
 *        the message will tell what type of test and, if it failed, indicate
 *        what the failure was.
 * 	
 *    DURATION
 * 	Terminates
 * 
 *    SIGNALS
 * 	None
 * 
 *    RESOURCES
 * 	None
 * 
 *    ENVIRONMENTAL NEEDS
 *      No run-time environmental needs.
 *
 *	If this test is not called with a full pathname, it must be able
 *	to find itself on $PATH
 * 
 *    INTERCASE DEPENDENCIES
 *	none
 * 
 *    DETAILED DESCRIPTION
 * 
 * 	Setup:
 * 	  Setup signal handling.
 * 	  Create and make current a temporary directory.
 * 	  Open a regular file for writing
 *	  Create a system pipe
 *	  Create a named pipe and open it for writing
 * 
 * 	Test:
 *	  Set the file descriptor for close-on-exec
 *	  Fork
 *		Child execlp's the program "test_open".
 *		If the exec fails, exit "2"
 *	        Parent waits
 * 	  Report results.
 * 
 * 	Cleanup:
 * 	  Close file and pipes
 * 	  Remove the temporary directory  
 * 
 *    BUGS
 * 
 *#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#**/

#include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <limits.h>

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

void setup();
void cleanup();
void help();

char *TCID="fcntl07";		/* Test program identifier.    */
int TST_TOTAL=2;		/* Total number of test cases. */
extern int Tst_count;		/* Test Case counter for tst_* routines */



/* for parse_opts */
int fflag, Tflag;		/* binary flags: opt or not */
char *fopt, *Topt;		/* option arguments */

option_t options[] = {
	{ "F:", &fflag, &fopt },	/* -F filename */
	{ "T:",	&Tflag, &Topt },	/* -T <fd>  exec'ed by test: test FD */
	{ NULL, NULL, NULL }
};

int stat_loc;			/* for waitpid() */

int file_fd, pipe_fds[2];
	/* file descriptors for a file and a system pipe */
#define DEFAULT_FILE "DefaultFileName"
char *File1 = DEFAULT_FILE;

#define DEFAULT_SUBPROG "test_open"
char *openck = DEFAULT_SUBPROG;		/* support program name to check for open FD */
char subprog_path[_POSIX_PATH_MAX];	/* path to exec "openck" with */
#define STRSIZE 255

int *testfds[] = {
    &file_fd,	&pipe_fds[1],	0
    };

char *testfdtypes[] = {
    "regular file",
    "write side of system pipe",
    };

int test_open(char *arg);
int do_exec(char *prog, int fd, char *tcd);

int
main(int ac, char **av)
{
    int lc;		/* loop counter */
    const char *msg;		/* message returned from parse_opts */
    
    int exec_return;	/* return from do_exec */
    int **tcp;		/* testcase pointer (pointer to FD) */
    char **tcd;		/* testcase description pointer */
    
    /***************************************************************
     * parse standard options, and exit if there is an error
     ***************************************************************/
    if ( (msg=parse_opts(ac, av, options, &help)) != (char *) NULL ) {
	tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
	tst_exit();
    }
    
    if(fflag)		/* -F option */
	File1 = fopt;
    
    if(Tflag) {		/* -T option */
	exit(test_open(Topt));
    }

    /***************************************************************
     * perform global setup for test
     ***************************************************************/
    setup(av[0]);
    
    /***************************************************************
     * 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;
	
	for(tcp = testfds, tcd = testfdtypes; *tcp; tcp++, tcd++) {

	    TEST(fcntl(**tcp, F_SETFD, FD_CLOEXEC));

	    /* check return code */
	    if ( TEST_RETURN == -1 ) {
		TEST_ERROR_LOG(TEST_ERRNO);
		tst_resm(TFAIL, "fcntl(%s[%d], F_SETFD, FD_CLOEXEC) Failed, errno=%d : %s",
			 *tcd, **tcp, TEST_ERRNO, strerror(TEST_ERRNO));
	    } else {
		
		/*************************************************************
		 * only perform functional verification if flag set 
		 * (-f not given)
		 *************************************************************/
		if ( STD_FUNCTIONAL_TEST ) {
		    
		    exec_return = do_exec(subprog_path, **tcp, *tcd);
		    
		    switch(exec_return) {
		    case -1:
			tst_resm(TBROK, "fork failed.  Errno %s [%d]", 
				 strerror(errno), errno);
			break;
		    case 1:
			tst_resm(TBROK, "waitpid return was 0%o", stat_loc);
			break;
		    case 2:
			tst_resm(TBROK, "exec failed");	/* errno was in child */
			break;
		    case 0:
			tst_resm(TPASS, "%s child exited 0, indicating that the file was closed",
				 *tcd);
			break;
		    default:
			tst_resm(TFAIL, "%s child exited non-zero, %d", *tcd, 
				 exec_return);
			break;
		    }
		}
	    }
	}
    }	/* End for TEST_LOOPING */
    
    /***************************************************************
     * cleanup and exit
     ***************************************************************/
    cleanup();

    return 0;
}	/* End main */

/***************************************************************
 * setup() - performs all ONE TIME setup for this test.
 ***************************************************************/
void 
setup(char *path)
{
    search_path(path, subprog_path, X_OK, 1);

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

    /* create a temporary directory and go to it */
    tst_tmpdir();

    /* set up a regular file */
    if((file_fd=open(File1, O_CREAT|O_RDWR, 0666)) == -1) {
	tst_brkm(TBROK, cleanup, "Open of file %s failed errno %d (%s)\n", File1, errno, strerror(errno));
    }

    /* set up a system pipe (write side gets CLOSE-ON-EXEC) */
    pipe(pipe_fds);

    /* 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;

    /* close everything */
    close(file_fd);
    close(pipe_fds[0]);
    close(pipe_fds[1]);

    /* remove temporary directory and all files in it. */
    tst_rmdir();

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

/***************************************************************************
 * issue a help message
 ***************************************************************************/
void
help()
{
    printf("-T fd     : If this option is given, the program runs as 'test_open'\n");
    printf("            testing <fd> to see if it is open or not and exiting accordingly\n");
    printf("-F name   : File to open.  Must be an absolute path,\n");
    printf("            and the file must be writable\n");
    printf("-n program: path to the 'test_open' program\n");
}

/*---------------------------------------------------------------------------*/
/* Perform an exec, then wait for the child to terminate.
 * The child's termination status determines the success of the test
 *
 * Return codes:
 *	-1	BROK	fork failed
 *	1	BROK	waitpid returned != exit status
 *	<else>	????	exit code from child:
 *	2	BROK	exec failed
 *	0	PASS	fd was properly closed
 *	
 */

int
do_exec(char *prog, int fd, char *tcd)
{
    int pid;
    char pidname[STRSIZE];
#ifdef DEBUG
    int rc, status; /* for the fcntl */
#endif

    /* set up arguments to exec'ed child */
    sprintf(pidname, "%d", fd);

#ifdef DEBUG
    rc = fcntl(fd, F_GETFD, &status);
    printf("%s: fd = %d rc = %d status= %d, errno= %d\n", tcd, fd, rc, status, errno);
#endif

    switch(pid=fork()) {
    case -1:
	return(-1);
    case 0:				/* child */
	execlp(prog, openck, "-T", pidname, 0);

	/* the ONLY reason to do this is to get the errno printed out */
	fprintf(stderr, "exec(%s, %s, -T, %s) failed.  Errno %s [%d]\n",
		prog, openck, pidname, strerror(errno), errno);
	exit(2);
    default:				/* parent */
	waitpid(pid, &stat_loc, 0);
	if(WIFEXITED(stat_loc)) {
	    return(WEXITSTATUS(stat_loc));
	} else {
	    return(1);
	}
    }
}

/*
 *    PROGRAM TITLE	: Test if a named file descriptor is open
 *    This function is called when fcntcs07 is called with the -T option.
 *    It tests if a file descriptor is open and exits accordingly.
 */
int
test_open(char *arg)
{
    int fd, rc;
    int status;
    
    fd = atoi(arg);

    rc = fcntl(fd, F_GETFD, &status);

#ifdef DEBUG_T
    printf("%s: fd = %d rc = %d status= %d, errno= %d\n", openck, fd, rc,
	   status, errno);
#endif

    if(rc == -1 && errno == EBADF) {
	exit(0);
    }

    if(rc != -1)
	exit(3);

    exit(errno);
    return -1;   /* to remove compiler warning on IRIX */
}