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-rw-r--r--tests/checkfs/checkfs.c695
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diff --git a/tests/checkfs/checkfs.c b/tests/checkfs/checkfs.c
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+/*
+
+ * Copyright Daniel Industries.
+ *
+ * Created by: Vipin Malik (vipin.malik@daniel.com)
+ *
+ * This code is released under the GPL version 2. See the file COPYING
+ * for more details.
+ *
+ * Software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing rights and
+ * limitations under the Licence.
+
+ This program opens files in progression (file00001, file00002 etc),
+ upto MAX_NUM_FILES and checks their CRC. If a file is not found or the
+ CRC does not match it stops it's operation.
+
+ Everything is logged in a logfile called './logfile'.
+
+ If everything is ok this program sends a signal, via com1, to the remote
+ power control box to power cycle this computer.
+
+ This program then proceeds to create new files file0....file<MAX_NUM_FILES>
+ in a endless loop and checksum each before closing them.
+
+ STRUCTURE OF THE FILES:
+ The fist int is the size of the file in bytes.
+ The last 2 bytes are the CRC for the entire file.
+ There is random data in between.
+
+ The files are opened in the current dir.
+
+ $Id: checkfs.c,v 1.8 2005/11/07 11:15:17 gleixner Exp $
+ $Log: checkfs.c,v $
+ Revision 1.8 2005/11/07 11:15:17 gleixner
+ [MTD / JFFS2] Clean up trailing white spaces
+
+ Revision 1.7 2001/06/21 23:04:17 dwmw2
+ Initial import to MTD CVS
+
+ Revision 1.6 2001/06/08 22:26:05 vipin
+ Split the modbus comm part of the program (that sends the ok to pwr me down
+ message) into another file "comm.c"
+
+ Revision 1.5 2001/06/08 21:29:56 vipin
+ fixed small issue with write() checking for < 0 instead of < (bytes to be written).
+ Now it does the latter (as it should).
+
+ Revision 1.4 2001/05/11 22:29:40 vipin
+ Added a test to check and err out if the first int in file (which tells us
+ how many bytes there are in the file) is zero. This will prevent a corrupt
+ file with zero's in it from passing the crc test.
+
+ Revision 1.3 2001/05/11 21:33:54 vipin
+ Changed to use write() rather than fwrite() when creating new file. Additionally,
+ and more important, it now does a single write() for the entire data. This will
+ enable us to use this program to test for power fail *data* reliability when
+ writing over an existing file, specially on powr fail "safe" file systems as
+ jffs/jffs2. Also added a new cmdline parameter "-e" that specifies the max # of
+ errors that can be tolerated. This should be set to ZERO to test for the above,
+ as old data should be reliabily maintained if the newer write never "took" before
+ power failed. If the write did succeed, then the newer data will have its own
+ CRC in place when it gets checked => hence no error. In theory at least!
+
+
+ Revision 1.2 2001/05/11 19:27:33 vipin
+ Added cmd line args to change serial port, and specify max size of
+ random files created. Some cleanup. Added -Wall to Makefile.
+
+ Revision 1.1 2001/05/11 16:06:28 vipin
+ Importing checkfs (the power fail test program) into CVS. This was
+ originally done for NEWS. NEWS had a lot of version, this is
+ based off the last one done for NEWS. The "makefiles" program
+ is run once initially to create the files in the current dir.
+ "checkfs" is then run on every powerup to check consistancy
+ of the files. See checkfs.c for more details.
+
+
+*/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include "common.h"
+
+
+
+extern int do_pwr_dn(int fd, int cycleCnt);
+
+#define CMDLINE_PORT "-p"
+#define CMDLINE_MAXFILEBYTES "-s"
+#define CMDLINE_MAXERROR "-e"
+#define CMDLINE_HELPSHORT "-?"
+#define CMDLINE_HELPLONG "--help"
+
+
+int CycleCount;
+
+char SerialDevice[255] = "/dev/ttyS0"; /* default, can be changed
+ through cmd line. */
+
+#define MAX_INTS_ALLOW 100000 /* max # of int's in the file written.
+ Statis limit to size struct. */
+float FileSizeMax = 1024.0; /*= (file size in bytes), MUST be float*/
+
+int MaxErrAllowed = 1; /* default, can ge changed thru cmd line*/
+
+
+/* Needed for CRC generation/checking */
+static const unsigned short crc_ccitt_table[] = {
+ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
+ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
+ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
+ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
+ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
+ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
+ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
+ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
+ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
+ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
+ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
+ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
+ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
+ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
+ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
+ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
+ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
+ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
+ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
+ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
+ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
+ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
+ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
+ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
+ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
+ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
+ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
+ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
+ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
+ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
+ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
+ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
+};
+
+
+/*
+ Set's up the Linux serial port. Must be passed string to device to
+ open. Parameters are fixed to 9600,e,1
+
+ [A possible enhancement to this program would be to pass these
+ parameters via the command line.]
+
+ Returns file descriptor to open port. Use this fd to write to port
+ and close it later, when done.
+*/
+int setupSerial (const char *dev) {
+ int i, fd;
+ struct termios tios;
+
+ fd = open(dev,O_RDWR | O_NDELAY );
+ if (fd < 0) {
+ fprintf(stderr, "%s: %s\n", dev, sys_errlist[errno]);
+ exit(1);
+ }
+ if (tcgetattr(fd, &tios) < 0) {
+ fprintf(stderr,"Could not get terminal attributes: %s",sys_errlist[errno]);
+ exit(1);
+ }
+
+ tios.c_cflag =
+ CS7 |
+ CREAD | // Enable Receiver
+ HUPCL | // Hangup after close
+ CLOCAL | // Ignore modem control lines
+ PARENB; // Enable parity (even by default)
+
+
+
+ tios.c_iflag = IGNBRK; // Ignore break
+ tios.c_oflag = 0;
+ tios.c_lflag = 0;
+ for(i = 0; i < NCCS; i++) {
+ tios.c_cc[i] = '\0'; // no special characters
+ }
+ tios.c_cc[VMIN] = 1;
+ tios.c_cc[VTIME] = 0;
+
+ cfsetospeed (&tios, B9600);
+ cfsetispeed (&tios, B9600);
+
+ if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+ fprintf(stderr,"Could not set attributes: ,%s",sys_errlist[errno]);
+ exit(1);
+ }
+ return fd;
+}
+
+
+
+
+
+//A portion of this code was taken from the AX.25 HDLC packet driver
+//in LINUX. Once I test and have a better understanding of what
+//it is doing, it will be better commented.
+
+//For now one can speculate that the CRC routine always expects the
+//CRC to calculate out to 0xf0b8 (the hardcoded value at the end)
+//and returns TRUE if it is and FALSE if it doesn't.
+//Why don't people document better!!!!
+int check_crc_ccitt(char *filename)
+{
+ FILE *fp;
+ FILE *logfp;
+ unsigned short crc = 0xffff;
+ int len;
+ char dataByte;
+ int retry;
+ char done;
+
+ fp = fopen(filename,"rb");
+ if(!fp){
+ logfp = fopen("logfile","a"); /*open for appending only.*/
+ fprintf(logfp, "Verify checksum:Error! Cannot open filename passed for verify checksum: %s\n",filename);
+ fclose(logfp);
+ return FALSE;
+ }
+
+
+ /*the first int contains an int that is the length of the file in long.*/
+ if(fread(&len, sizeof(int), 1, fp) != 1){
+ logfp = fopen("logfile","a"); /*open for appending only.*/
+ fprintf(logfp, "verify checksum:Error reading from file: %s\n", filename);
+ fclose(fp);
+ fclose(logfp);
+ return FALSE;
+ }
+
+ /* printf("Checking %i bytes for CRC in \"%s\".\n", len, filename); */
+
+ /* Make sure that we did not read 0 as the number of bytes in file. This
+ check prevents a corrupt file with zero's in it from passing the
+ CRC test. A good file will always have some data in it. */
+ if(len == 0)
+ {
+
+ logfp = fopen("logfile","a"); /*open for appending only.*/
+ fprintf(logfp, "verify checksum: first int claims there are 0 data in file. Error!: %s\n", filename);
+ fclose(fp);
+ fclose(logfp);
+ return FALSE;
+ }
+
+
+ rewind(fp);
+ len+=2; /*the file has two extra bytes at the end, it's checksum. Those
+ two MUST also be included in the checksum calculation.
+ */
+
+ for (;len>0;len--){
+ retry=5; /*retry 5 times*/
+ done = FALSE;
+ while(!done){
+ if(fread(&dataByte, sizeof(char), 1, fp) != 1){
+ retry--;
+ }else{
+ done = TRUE;
+ }
+ if(retry == 0){
+ done = TRUE;
+ }
+ }
+ if(!retry){
+ logfp = fopen("logfile","a"); /*open for appending only.*/
+ fprintf(logfp, "Unexpected end of file: %s\n", filename);
+ fprintf(logfp, "...bytes left to be read %i.\n",len);
+ fclose(logfp);
+ fclose(fp);
+ return FALSE;
+ }
+ crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ dataByte) & 0xff];
+ }
+ fclose(fp);
+ if( (crc & 0xffff) != 0xf0b8){
+ /*printf("The CRC of read file:%x\n", crc); */
+ return FALSE;
+ }
+ return TRUE;
+}/*end check_crc_ccitt() */
+
+
+
+/*
+ Sends "OK to power me down" message to the remote
+ power cycling box, via the serial port.
+ Also updates the num power cycle count in a local
+ file.
+ This file "./cycleCnt" must be present. This is
+ initially (and once) created by the separate "makefiles.c"
+ program.
+*/
+void send_pwrdn_ok(void){
+
+ int fd;
+ FILE *cyclefp;
+ int cycle_fd;
+
+ cyclefp = fopen("cycleCnt","rb");
+ if(!cyclefp){
+ printf("expecting file \"cycleCnt\". Cannot continue.\n");
+ exit(1);
+ }
+ if(fread(&CycleCount, sizeof(CycleCount),1,cyclefp) != 1){
+ fprintf(stderr, "Error! Unexpected end of file cycleCnt.\n");
+ exit(1);
+ }
+ fclose(cyclefp);
+
+ CycleCount++;
+
+ /*now write this puppy back*/
+ cyclefp = fopen("cycleCnt","wb");
+ cycle_fd = fileno(cyclefp);
+ if(!cyclefp){
+ fprintf(stderr, "Error! cannot open file for write:\"cycleCnt\". Cannot continue.\n");
+ exit(1);
+ }
+ if(fwrite(&CycleCount, sizeof(CycleCount), 1,cyclefp) !=1){
+ fprintf(stderr, "Error writing to file cycleCnt. Cannot continue.\n");
+ exit(1);
+ }
+ if(fdatasync(cycle_fd)){
+ fprintf(stderr, "Error! cannot sync file buffer with disk.\n");
+ exit(1);
+ }
+
+ fclose(cyclefp);
+ (void)sync();
+
+ printf("\n\n Sending Power down command to the remote box.\n");
+ fd = setupSerial(SerialDevice);
+
+ if(do_pwr_dn(fd, CycleCount) < 0)
+ {
+ fprintf(stderr, "Error sending power down command.\n");
+ exit(1);
+ }
+
+ close(fd);
+}//end send_pwrnd_ok()
+
+
+
+
+/*
+ Appends 16bit CRC at the end of numBytes long buffer.
+ Make sure buf, extends at least 2 bytes beyond.
+ */
+void appendChecksum(char *buf, int numBytes){
+
+ unsigned short crc = 0xffff;
+ int index = 0;
+
+ /* printf("Added CRC (2 bytes) to %i bytes.\n", numBytes); */
+
+ for (; numBytes > 0; numBytes--){
+
+ crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ buf[index++]) & 0xff];
+ }
+ crc ^= 0xffff;
+ /*printf("The CRC: %x\n\n", crc);*/
+
+ buf[index++] = crc;
+ buf[index++] = crc >> 8;
+
+
+
+}/*end checksum()*/
+
+
+
+
+
+/*
+ This guy make a new "random data file" with the filename
+ passed to it. This file is checksummed with the checksum
+ stored at the end. The first "int" in the file is the
+ number of int's in it (this is needed to know how much
+ data to read and checksum later).
+*/
+void make_new_file(char *filename){
+
+
+ int dfd; /* data file descriptor */
+ int rand_data;
+ int data_size;
+ int temp_size;
+ int dataIndex = 0;
+ int err;
+
+
+ struct {
+ int sizeInBytes; /* must be int */
+ int dataInt[MAX_INTS_ALLOW+1]; /* how many int's can we write? */
+ }__attribute((packed)) dataBuf;
+
+
+ fprintf(stderr, "Creating File:%s. ", filename);
+
+ if((dfd = open(filename, O_RDWR | O_CREAT | O_SYNC)) <= 0)
+ {
+ printf("Error! Cannot open file: %s\n",filename);
+ perror("Error");
+ exit(1);
+ }
+
+ /*now write a bunch of random binary data to the file*/
+ /*first figure out how much data to write. That is random also.*/
+
+ /*file should not be less than 5 ints long. (so that we have decent length files,
+ that's all)*/
+ while(
+ ((data_size = (int)(1+(int)((FileSizeMax/sizeof(int))*rand()/(RAND_MAX+1.0)))) < 5)
+ );
+
+ /* printf("Writing %i ints to the file.\n", data_size); */
+
+ temp_size = data_size * sizeof(int);
+
+ /* Make sure that all data is written in one go! This is important to
+ check for reliability of file systems like JFFS/JFFS that purport to
+ have "reliable" writes during powre fail.
+ */
+
+ dataBuf.sizeInBytes = temp_size;
+
+ data_size--; /*one alrady written*/
+ dataIndex = 0;
+
+ while(data_size--){
+ rand_data = (int)(1 + (int)(10000.0*rand()/(RAND_MAX+1.0)));
+
+ dataBuf.dataInt[dataIndex++] = rand_data;
+
+ }
+
+ /*now calculate the file checksum and append it to the end*/
+ appendChecksum((char *)&dataBuf, dataBuf.sizeInBytes);
+
+ /* 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 allowd is %i.\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;
+ unsigned short numberFiles;
+ char error = FALSE;
+ short errorCnt = 0;
+ time_t timep;
+ char * time_string;
+ unsigned int seed;
+
+
+ numberFiles = MAX_NUM_FILES;
+
+ 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();
+
+ error = TRUE;
+ 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()*/