689 lines
21 KiB
C
689 lines
21 KiB
C
/*
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* Copyright Daniel Industries.
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*
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* Created by: Vipin Malik (vipin.malik@daniel.com)
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*
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* This code is released under the GPL version 2. See the file COPYING
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* for more details.
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*
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* Software distributed under the Licence is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the Licence for the specific language governing rights and
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* limitations under the Licence.
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This program opens files in progression (file00001, file00002 etc),
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upto MAX_NUM_FILES and checks their CRC. If a file is not found or the
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CRC does not match it stops it's operation.
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Everything is logged in a logfile called './logfile'.
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If everything is ok this program sends a signal, via com1, to the remote
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power control box to power cycle this computer.
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This program then proceeds to create new files file0....file<MAX_NUM_FILES>
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in a endless loop and checksum each before closing them.
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STRUCTURE OF THE FILES:
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The fist int is the size of the file in bytes.
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The last 2 bytes are the CRC for the entire file.
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There is random data in between.
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The files are opened in the current dir.
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$Id: checkfs.c,v 1.8 2005/11/07 11:15:17 gleixner Exp $
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$Log: checkfs.c,v $
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Revision 1.8 2005/11/07 11:15:17 gleixner
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[MTD / JFFS2] Clean up trailing white spaces
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Revision 1.7 2001/06/21 23:04:17 dwmw2
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Initial import to MTD CVS
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Revision 1.6 2001/06/08 22:26:05 vipin
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Split the modbus comm part of the program (that sends the ok to pwr me down
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message) into another file "comm.c"
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Revision 1.5 2001/06/08 21:29:56 vipin
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fixed small issue with write() checking for < 0 instead of < (bytes to be written).
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Now it does the latter (as it should).
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Revision 1.4 2001/05/11 22:29:40 vipin
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Added a test to check and err out if the first int in file (which tells us
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how many bytes there are in the file) is zero. This will prevent a corrupt
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file with zero's in it from passing the crc test.
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Revision 1.3 2001/05/11 21:33:54 vipin
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Changed to use write() rather than fwrite() when creating new file. Additionally,
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and more important, it now does a single write() for the entire data. This will
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enable us to use this program to test for power fail *data* reliability when
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writing over an existing file, specially on powr fail "safe" file systems as
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jffs/jffs2. Also added a new cmdline parameter "-e" that specifies the max # of
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errors that can be tolerated. This should be set to ZERO to test for the above,
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as old data should be reliabily maintained if the newer write never "took" before
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power failed. If the write did succeed, then the newer data will have its own
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CRC in place when it gets checked => hence no error. In theory at least!
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Revision 1.2 2001/05/11 19:27:33 vipin
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Added cmd line args to change serial port, and specify max size of
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random files created. Some cleanup. Added -Wall to Makefile.
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Revision 1.1 2001/05/11 16:06:28 vipin
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Importing checkfs (the power fail test program) into CVS. This was
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originally done for NEWS. NEWS had a lot of version, this is
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based off the last one done for NEWS. The "makefiles" program
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is run once initially to create the files in the current dir.
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"checkfs" is then run on every powerup to check consistancy
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of the files. See checkfs.c for more details.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <time.h>
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#include "common.h"
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extern int do_pwr_dn(int fd, int cycleCnt);
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#define CMDLINE_PORT "-p"
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#define CMDLINE_MAXFILEBYTES "-s"
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#define CMDLINE_MAXERROR "-e"
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#define CMDLINE_HELPSHORT "-?"
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#define CMDLINE_HELPLONG "--help"
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int CycleCount;
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char SerialDevice[255] = "/dev/ttyS0"; /* default, can be changed
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through cmd line. */
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#define MAX_INTS_ALLOW 100000 /* max # of int's in the file written.
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Statis limit to size struct. */
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float FileSizeMax = 1024.0; /*= (file size in bytes), MUST be float*/
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int MaxErrAllowed = 1; /* default, can ge changed thru cmd line*/
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/* Needed for CRC generation/checking */
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static const unsigned short crc_ccitt_table[] = {
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0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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};
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/*
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Set's up the Linux serial port. Must be passed string to device to
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open. Parameters are fixed to 9600,e,1
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[A possible enhancement to this program would be to pass these
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parameters via the command line.]
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Returns file descriptor to open port. Use this fd to write to port
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and close it later, when done.
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*/
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int setupSerial (const char *dev) {
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int i, fd;
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struct termios tios;
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fd = open(dev,O_RDWR | O_NDELAY );
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if (fd < 0) {
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fprintf(stderr, "%s: %s\n", dev, strerror(errno));
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exit(1);
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}
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if (tcgetattr(fd, &tios) < 0) {
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fprintf(stderr, "Could not get terminal attributes: %s", strerror(errno));
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exit(1);
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}
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tios.c_cflag =
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CS7 |
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CREAD | // Enable Receiver
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HUPCL | // Hangup after close
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CLOCAL | // Ignore modem control lines
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PARENB; // Enable parity (even by default)
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tios.c_iflag = IGNBRK; // Ignore break
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tios.c_oflag = 0;
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tios.c_lflag = 0;
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for(i = 0; i < NCCS; i++) {
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tios.c_cc[i] = '\0'; // no special characters
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}
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tios.c_cc[VMIN] = 1;
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tios.c_cc[VTIME] = 0;
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cfsetospeed (&tios, B9600);
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cfsetispeed (&tios, B9600);
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if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
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fprintf(stderr, "Could not set attributes: ,%s", strerror(errno));
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exit(1);
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}
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return fd;
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}
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//A portion of this code was taken from the AX.25 HDLC packet driver
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//in LINUX. Once I test and have a better understanding of what
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//it is doing, it will be better commented.
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//For now one can speculate that the CRC routine always expects the
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//CRC to calculate out to 0xf0b8 (the hardcoded value at the end)
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//and returns TRUE if it is and FALSE if it doesn't.
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//Why don't people document better!!!!
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int check_crc_ccitt(char *filename)
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{
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FILE *fp;
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FILE *logfp;
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unsigned short crc = 0xffff;
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int len;
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char dataByte;
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int retry;
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char done;
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fp = fopen(filename,"rb");
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if(!fp){
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logfp = fopen("logfile","a"); /*open for appending only.*/
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fprintf(logfp, "Verify checksum:Error! Cannot open filename passed for verify checksum: %s\n",filename);
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fclose(logfp);
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return FALSE;
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}
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/*the first int contains an int that is the length of the file in long.*/
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if(fread(&len, sizeof(int), 1, fp) != 1){
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logfp = fopen("logfile","a"); /*open for appending only.*/
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fprintf(logfp, "verify checksum:Error reading from file: %s\n", filename);
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fclose(fp);
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fclose(logfp);
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return FALSE;
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}
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/* printf("Checking %i bytes for CRC in \"%s\".\n", len, filename); */
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/* Make sure that we did not read 0 as the number of bytes in file. This
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check prevents a corrupt file with zero's in it from passing the
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CRC test. A good file will always have some data in it. */
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if(len == 0)
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{
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logfp = fopen("logfile","a"); /*open for appending only.*/
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fprintf(logfp, "verify checksum: first int claims there are 0 data in file. Error!: %s\n", filename);
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fclose(fp);
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fclose(logfp);
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return FALSE;
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}
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rewind(fp);
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len+=2; /*the file has two extra bytes at the end, it's checksum. Those
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two MUST also be included in the checksum calculation.
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*/
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for (;len>0;len--){
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retry=5; /*retry 5 times*/
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done = FALSE;
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while(!done){
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if(fread(&dataByte, sizeof(char), 1, fp) != 1){
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retry--;
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}else{
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done = TRUE;
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}
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if(retry == 0){
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done = TRUE;
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}
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}
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if(!retry){
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logfp = fopen("logfile","a"); /*open for appending only.*/
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fprintf(logfp, "Unexpected end of file: %s\n", filename);
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fprintf(logfp, "...bytes left to be read %i.\n",len);
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fclose(logfp);
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fclose(fp);
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return FALSE;
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}
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crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ dataByte) & 0xff];
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}
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fclose(fp);
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if( (crc & 0xffff) != 0xf0b8){
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/*printf("The CRC of read file:%x\n", crc); */
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return FALSE;
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}
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return TRUE;
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}/*end check_crc_ccitt() */
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/*
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Sends "OK to power me down" message to the remote
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power cycling box, via the serial port.
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Also updates the num power cycle count in a local
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file.
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This file "./cycleCnt" must be present. This is
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initially (and once) created by the separate "makefiles.c"
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program.
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*/
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void send_pwrdn_ok(void){
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int fd;
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FILE *cyclefp;
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int cycle_fd;
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cyclefp = fopen("cycleCnt","rb");
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if(!cyclefp){
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printf("expecting file \"cycleCnt\". Cannot continue.\n");
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exit(1);
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}
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if(fread(&CycleCount, sizeof(CycleCount),1,cyclefp) != 1){
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fprintf(stderr, "Error! Unexpected end of file cycleCnt.\n");
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exit(1);
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}
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fclose(cyclefp);
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CycleCount++;
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/*now write this puppy back*/
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cyclefp = fopen("cycleCnt","wb");
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cycle_fd = fileno(cyclefp);
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if(!cyclefp){
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fprintf(stderr, "Error! cannot open file for write:\"cycleCnt\". Cannot continue.\n");
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exit(1);
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}
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if(fwrite(&CycleCount, sizeof(CycleCount), 1,cyclefp) !=1){
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fprintf(stderr, "Error writing to file cycleCnt. Cannot continue.\n");
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exit(1);
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}
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if(fdatasync(cycle_fd)){
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fprintf(stderr, "Error! cannot sync file buffer with disk.\n");
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exit(1);
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}
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fclose(cyclefp);
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(void)sync();
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printf("\n\n Sending Power down command to the remote box.\n");
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fd = setupSerial(SerialDevice);
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if(do_pwr_dn(fd, CycleCount) < 0)
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{
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fprintf(stderr, "Error sending power down command.\n");
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exit(1);
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}
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close(fd);
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}//end send_pwrnd_ok()
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/*
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Appends 16bit CRC at the end of numBytes long buffer.
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Make sure buf, extends at least 2 bytes beyond.
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*/
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void appendChecksum(char *buf, int numBytes){
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unsigned short crc = 0xffff;
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int index = 0;
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/* printf("Added CRC (2 bytes) to %i bytes.\n", numBytes); */
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for (; numBytes > 0; numBytes--){
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crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ buf[index++]) & 0xff];
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}
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crc ^= 0xffff;
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/*printf("The CRC: %x\n\n", crc);*/
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buf[index++] = crc;
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buf[index++] = crc >> 8;
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}/*end checksum()*/
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/*
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This guy make a new "random data file" with the filename
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passed to it. This file is checksummed with the checksum
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stored at the end. The first "int" in the file is the
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number of int's in it (this is needed to know how much
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data to read and checksum later).
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*/
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void make_new_file(char *filename){
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int dfd; /* data file descriptor */
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int rand_data;
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int data_size;
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int temp_size;
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int dataIndex = 0;
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int err;
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struct {
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int sizeInBytes; /* must be int */
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int dataInt[MAX_INTS_ALLOW+1]; /* how many int's can we write? */
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}__attribute((packed)) dataBuf;
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fprintf(stderr, "Creating File:%s. ", filename);
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if((dfd = open(filename, O_RDWR | O_CREAT | O_SYNC, S_IRWXU)) <= 0)
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{
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printf("Error! Cannot open file: %s\n",filename);
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perror("Error");
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exit(1);
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}
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/*now write a bunch of random binary data to the file*/
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/*first figure out how much data to write. That is random also.*/
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/*file should not be less than 5 ints long. (so that we have decent length files,
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that's all)*/
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while(
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((data_size = (int)(1+(int)((FileSizeMax/sizeof(int))*rand()/(RAND_MAX+1.0)))) < 5)
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);
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/* printf("Writing %i ints to the file.\n", data_size); */
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temp_size = data_size * sizeof(int);
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/* Make sure that all data is written in one go! This is important to
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check for reliability of file systems like JFFS/JFFS that purport to
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have "reliable" writes during powre fail.
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*/
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dataBuf.sizeInBytes = temp_size;
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data_size--; /*one alrady written*/
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dataIndex = 0;
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while(data_size--){
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rand_data = (int)(1 + (int)(10000.0*rand()/(RAND_MAX+1.0)));
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dataBuf.dataInt[dataIndex++] = rand_data;
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}
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/*now calculate the file checksum and append it to the end*/
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appendChecksum((char *)&dataBuf, dataBuf.sizeInBytes);
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/* Don't forget to increase the size of data written by the 2 chars of CRC at end.
|
|
These 2 bytes are NOT included in the sizeInBytes field. */
|
|
if((err = write(dfd, (void *)&dataBuf, dataBuf.sizeInBytes + sizeof(short))) <
|
|
(dataBuf.sizeInBytes + sizeof(short))
|
|
)
|
|
{
|
|
printf("Error writing data buffer to file. Written %i bytes rather than %i bytes.",
|
|
err, dataBuf.sizeInBytes);
|
|
perror("Error");
|
|
exit(1);
|
|
}
|
|
|
|
/* Now that the data is (hopefully) safely written. I can truncate the file to the new
|
|
length so that I can reclaim any unused space, if the older file was larger.
|
|
*/
|
|
if(ftruncate(dfd, dataBuf.sizeInBytes + sizeof(short)) < 0)
|
|
{
|
|
perror("Error: Unable to truncate file.");
|
|
exit(1);
|
|
}
|
|
|
|
|
|
close(dfd);
|
|
|
|
|
|
}//end make_new_file()
|
|
|
|
|
|
|
|
/*
|
|
Show's help on stdout
|
|
*/
|
|
void printHelp(char **argv)
|
|
{
|
|
printf("Usage:%s <options, defined below>\n", argv[0]);
|
|
printf("%s </dev/ttyS0,1,2...>: Set com port to send ok to pwr dn msg on\n",
|
|
CMDLINE_PORT);
|
|
printf("%s <n>: Set Max size in bytes of each file to be created.\n",
|
|
CMDLINE_MAXFILEBYTES);
|
|
printf("%s <n>: Set Max errors allowed when checking all files for CRC on start.\n",
|
|
CMDLINE_MAXERROR);
|
|
printf("%s or %s: This Help screen.\n", CMDLINE_HELPSHORT,
|
|
CMDLINE_HELPLONG);
|
|
|
|
}/* end printHelp()*/
|
|
|
|
|
|
|
|
void processCmdLine(int argc, char **argv)
|
|
{
|
|
|
|
int cnt;
|
|
|
|
/* skip past name of this program, process rest */
|
|
for(cnt = 1; cnt < argc; cnt++)
|
|
{
|
|
if(strcmp(argv[cnt], CMDLINE_PORT) == 0)
|
|
{
|
|
strncpy(SerialDevice, argv[++cnt], sizeof(SerialDevice));
|
|
continue;
|
|
}else
|
|
if(strcmp(argv[cnt], CMDLINE_MAXFILEBYTES) == 0)
|
|
{
|
|
FileSizeMax = (float)atoi(argv[++cnt]);
|
|
if(FileSizeMax > (MAX_INTS_ALLOW*sizeof(int)))
|
|
{
|
|
printf("Max file size allowed is %zu.\n",
|
|
MAX_INTS_ALLOW*sizeof(int));
|
|
exit(0);
|
|
}
|
|
|
|
continue;
|
|
}else
|
|
if(strcmp(argv[cnt], CMDLINE_HELPSHORT) == 0)
|
|
{
|
|
printHelp(argv);
|
|
exit(0);
|
|
|
|
}else
|
|
if(strcmp(argv[cnt], CMDLINE_HELPLONG) == 0)
|
|
{
|
|
printHelp(argv);
|
|
exit(0);
|
|
}else
|
|
|
|
if(strcmp(argv[cnt], CMDLINE_MAXERROR) == 0)
|
|
{
|
|
MaxErrAllowed = atoi(argv[++cnt]);
|
|
}
|
|
else
|
|
{
|
|
printf("Unknown cmd line option:%s\n", argv[cnt]);
|
|
printHelp(argv);
|
|
exit(0);
|
|
|
|
}
|
|
}
|
|
|
|
|
|
}/* end processCmdLine() */
|
|
|
|
|
|
|
|
|
|
|
|
int main(int argc, char **argv){
|
|
|
|
FILE *logfp;
|
|
int log_fd;
|
|
char filename[30];
|
|
short filenameCounter = 0;
|
|
unsigned short counter;
|
|
short errorCnt = 0;
|
|
time_t timep;
|
|
char * time_string;
|
|
unsigned int seed;
|
|
|
|
if(argc >= 1)
|
|
{
|
|
processCmdLine(argc, argv);
|
|
}
|
|
|
|
/*
|
|
First open MAX_NUM_FILES and make sure that the checksum is ok.
|
|
Also make an intry into the logfile.
|
|
*/
|
|
/* timestamp! */
|
|
time(&timep);
|
|
time_string = (char *)ctime((time_t *)&timep);
|
|
|
|
/*start a new check, make a log entry and continue*/
|
|
logfp = fopen("logfile","a"); /*open for appending only.*/
|
|
log_fd = fileno(logfp);
|
|
fprintf(logfp,"%s", time_string);
|
|
fprintf(logfp,"Starting new check.\n");
|
|
if(fdatasync(log_fd) == -1){
|
|
fprintf(stderr,"Error! Cannot sync file data with disk.\n");
|
|
exit(1);
|
|
}
|
|
|
|
fclose(logfp);
|
|
(void)sync();
|
|
|
|
/*
|
|
Now check all random data files in this dir.
|
|
*/
|
|
for(counter=0;counter<MAX_NUM_FILES;counter++){
|
|
|
|
fprintf(stderr, "%i.", counter);
|
|
|
|
/*create the filename in sequence. The number of files
|
|
to check and the algorithm to create the filename is
|
|
fixed and known in advance.*/
|
|
sprintf(filename,"file%i",filenameCounter++);
|
|
|
|
if(!check_crc_ccitt(filename)){
|
|
/*oops, checksum does not match. Make an entry into the log file
|
|
and decide if we can continue or not.*/
|
|
fprintf(stderr, "crcError:%s ", filename);
|
|
logfp = fopen("logfile","a"); /*open for appending only.*/
|
|
log_fd = fileno(logfp);
|
|
fprintf(logfp,"CRC error in file: %s\n", filename);
|
|
if(fdatasync(log_fd) == -1){
|
|
fprintf(stderr,"Error! Cannot sync file data with disk.\n");
|
|
exit(1);
|
|
}
|
|
fclose(logfp);
|
|
(void)sync();
|
|
|
|
errorCnt++;
|
|
|
|
if(errorCnt > MaxErrAllowed){
|
|
logfp = fopen("logfile","a"); /*open for appending only.*/
|
|
log_fd = fileno(logfp);
|
|
fprintf(logfp,"\nMax Error count exceed. Stopping!\n");
|
|
if(fdatasync(log_fd) == -1){
|
|
fprintf(stderr,"Error! Cannot sync file data with disk.\n");
|
|
exit(1);
|
|
}
|
|
fclose(logfp);
|
|
(void)sync();
|
|
|
|
fprintf(stderr, "Too many errors. See \"logfile\".\n");
|
|
exit(1);
|
|
}/* if too many errors */
|
|
|
|
/*we have decided to continue, however first repair this file
|
|
so that we do not cumulate errors across power cycles.*/
|
|
make_new_file(filename);
|
|
}
|
|
}//for
|
|
|
|
/*all files checked, make a log entry and continue*/
|
|
logfp = fopen("logfile","a"); /*open for appending only.*/
|
|
log_fd = fileno(logfp);
|
|
fprintf(logfp,"All files checked. Total errors found: %i\n\n", errorCnt);
|
|
if(fdatasync(log_fd)){
|
|
fprintf(stderr, "Error! cannot sync file buffer with disk.\n");
|
|
exit(1);
|
|
}
|
|
|
|
fclose(logfp);
|
|
(void)sync();
|
|
|
|
/*now send a message to the remote power box and have it start a random
|
|
pwer down timer after which power will be killed to this unit.
|
|
*/
|
|
send_pwrdn_ok();
|
|
|
|
/*now go into a forever loop of writing to files and CRC'ing them on
|
|
a continious basis.*/
|
|
|
|
/*start from a random file #*/
|
|
/*seed rand based on the current time*/
|
|
seed = (unsigned int)time(NULL);
|
|
srand(seed);
|
|
|
|
filenameCounter=(int)(1+(int)((float)(MAX_NUM_FILES-1)*rand()/(RAND_MAX+1.0)));
|
|
|
|
while(1){
|
|
|
|
for(;filenameCounter<MAX_NUM_FILES;filenameCounter++){
|
|
|
|
/*create the filename in sequence*/
|
|
sprintf(filename,"file%i",filenameCounter);
|
|
make_new_file(filename);
|
|
}
|
|
filenameCounter = 0;
|
|
}
|
|
|
|
exit(0); /* though we will never reach here, but keeps the compiler happy*/
|
|
}/*end main()*/
|