Why i am having free(): invalid next size (normal) error. here is code
 

#define _GNU_SOURCE
#include<stdio.h>
#include<stdlib.h>
#include<sys/queue.h>
#include<string.h>
#include<fcntl.h>
#include<unistd.h>
#include "cal_record_header.h"
#include "cal_handle_recording.h"



#define LUN_LOGGING 1
#define CLIENT_LOGGING 2
#define DELAY 100000

#define SUCCESS 0
#define FILE_OPENING_ERROR 1
#define MEMORY_ALLOCATION_ERROR 3
#define INVALID_LOG_FILE 4
#define INVALID_COMMAND_LINE_OPTION 5



file_header fileheader;
int policy=2;
int output_options[10]={0};
int req_flag;

typedef struct filepointer
{
int flag;
__u32 policy_id;
}FILE_POINTERS;

typedef struct file_names
{
char name[100];
}filenames;

struct details
{
__u32 unique_id;
char *device_name;
char *device_id;
}mapping_details[200];
int mapping_cnt=0;

//function declarations
int parse_arguments(int,char*[]);
int usage_message();
int apply_policy(int);
int islogfile(int,int,char*);
//end of function declarations

int main(int argc, char *argv[])
{
system("clear");
if(argc > 2)
{
return(usage_message());
}
else
return(parse_arguments(argc, argv));

}//end of main

int usage_message()
{
printf("\nUsage: Filesplitter [-options] ");
printf("\nOptions :-");
printf("\n -h/-H help");
printf("\n -v/-V verbose");
printf("\nIf no options are specified then default option will be without verbose.");
printf("\nOn execution file splitter will open file /opt/nHosts/etc/replay_config.");
printf("\nThen it will split the giant files specified in replay_config file.");
printf("\nThese splitted files will be placed in /nHosts/tmp/split directory.");
printf("\nExample :./Filesplitter");
printf("\nExample :./Filesplitter -v \n\n");
return(INVALID_COMMAND_LINE_OPTION);
}

int parse_arguments(int argc, char *argv[])
{
if(argc ==2)
{
if(argv[1][0]!='-')
{
return(usage_message());
}
else
{
switch(argv[1][1])
{
case 'v' : output_options[0] = 1; break;
case 'V' : output_options[0] = 1; break;
default : return(usage_message());
}//end of switch
}//end of else
return(apply_policy(argc));
}//end of if
else
{
return(apply_policy(argc));
}//end of else
}//end of function parse_arugments


int islogfile(int fd,int fd1,char *name)
{
char *header=NULL,*desc=NULL,*temp_buff=NULL,*p=NULL,*num=NULL,ch,*t=" \n";
int location1=0,location2=0,bus,channel,id,lun,i,j,ret;

header=(char *)malloc(sizeof(char)*5);
read(fd,header,4);
read(fd,&ch,sizeof(char));//for :
read(fd,&ch,sizeof(char));//for /n
header[5]='\0';
if(strncmp("SOFH",header,4)!=0)
{
printf("\nFile %s is not a valid log file. \n",name);
return(-1);
}
else
{
if(read(fd,&fileheader,sizeof(file_header)))
{
if(fileheader.desc_size)
{
desc=(char *)malloc(fileheader.desc_size+1);
read(fd,desc,fileheader.desc_size+1);
}
read(fd,header,sizeof(char)*5); //for:EOFH
read(fd,&ch,sizeof(char)); //for \n
if(strncmp(":EOFH",header,5)!=0)
{
printf("\nGiven file %s is not a valid log file. \n",name);
return(-1);
}
if(output_options[0]==1)
{
printf("\n\nINPUT FILE DETAILS");
printf("\nFile Name : %s",name);
printf("\nFile Version : %s",fileheader.version);
printf("\nFile Description : %s",desc);
switch(fileheader.is_data_logged)
{
case 1: printf("\nFile Data : File is logged without data for Read/Write commands.");
break;
case 2: printf("\nFile Data : File is logged without data for Read commands.");
break;
case 3: printf("\nFile Data : File is logged without data for Write commands.");
break;
case 4: printf("\nFile Data : File is logged with data for all commands.");
break;
}//end of switch
}//end of if
}//end of if
}//end of else

if(desc)
{
free(desc); //desc is no more of use
desc=NULL;
}
location1=lseek64(fd,0,SEEK_CUR);
lseek64(fd1,location1,SEEK_SET);

read(fd,header,sizeof(char)*5);
if(strncmp("SODH:",header,5)!=0)
{
printf("\nGiven file %s is not a valid log file. \n",name);
return(-1);
}
read(fd,&ch,sizeof(char));//for \n
while(1)
{
read(fd,&ch,sizeof(char));
if(ch==':')
{
read(fd,header,sizeof(char)*4);
header[4]='\0';
if(strncmp(header,"EODH",4)==0)
break;
}
}//end of while

location2= lseek64(fd,0,SEEK_CUR);
temp_buff=(char *)malloc(location2-location1-11);
read(fd1,header,sizeof(char)*4);
read(fd1,&ch,sizeof(char));
read(fd1,&ch,sizeof(char));
read(fd1,temp_buff,location2-location1-5);
read(fd,&ch,sizeof(char));
printf("\nHeader is : \n%s",temp_buff);
ret=lseek(fd,0,SEEK_CUR);//used to return value from islogfile
location1=1; //reusing variable for parsing
p=strtok(temp_buff,t);
while(p!=NULL)
{
switch(location1)
{
case 1: mapping_details[mapping_cnt].device_id=(char *)malloc(sizeof(p));
strcpy(mapping_details[mapping_cnt].device_id,p);
location1++;
break;
case 2: mapping_details[mapping_cnt].device_name=(char *)malloc(sizeof(p));
strcpy(mapping_details[mapping_cnt].device_name,p);
location1++;
break;
case 3: if(strstr(mapping_details[mapping_cnt].device_name,"-")!=NULL)
{
mapping_details[mapping_cnt].device_name=(char *)malloc(sizeof(p));
strcpy(mapping_details[mapping_cnt].device_name,p);
}
location1=1;
mapping_cnt++;
break;
}//end of switch
p=strtok(NULL,t);
}//end of while

t="[:]";

for(location1=0;location1<mapping_cnt;location1++)
{
location2=1;
num=NULL;
num=(char *)malloc(sizeof(mapping_details[location1].device_id));
strcpy(num,mapping_details[location1].device_id);
p=strtok(num,t);
while(p!=NULL)
{
switch(location2)
{
case 1: bus=atoi(p);location2++;break;
case 2: channel=atoi(p);location2++;break;
case 3: id=atoi(p);location2++;break;
case 4: lun=atoi(p);location2++;break;
}//end of switch
p=strtok(NULL,t);
}//end of while
mapping_details[location1].unique_id=(bus<<24)+(channel<<16)+(id<<8)+lun;
//printf("\nBus: %d, channel :%d id:%d, lun :%d ",bus,channel,id,lun);
//printf("\n%d)Device: %s Device id : %s Unique id : 0x%08x",location1,mapping_details[location1].device_name,mapping_details[location1].device_id,mapping_details[location1].unique_id);
}//end of for
if(header)
{
free(header);
header=NULL;
}
printf("\nGiven file %s is successfully verified.",name);
return(ret);
}//end of function is log file








int apply_policy(int argc)
{
FILE_POINTERS file_pointer[200];
filenames FILENAMES[200];
filenames GIANT_FILENAMES[30];
__u32 policy_id,id;
int input_file_pointer,response_pointer;
FILE *config_file_pointer=NULL;
log_header *logheader=NULL;
scsi_cmd_req *req=NULL;
scsi_cmd_resp *resp=NULL;
char input_file_name[4096],path_name[4096];
char ch,s[1024],*t=" ",*p=NULL,*buff=NULL,*fname=NULL,*temp_fname=NULL;
int i,giant_file_counter=0,file_counter=0,flag,curReqLoc,curr_pos;
int splitter_cnt,maxlength=0;


config_file_pointer=fopen("/opt/nHosts/etc/replay_config","r");
if(config_file_pointer == NULL)
{
printf("\nConfiguration file doesn't exist or Error in opening file. \n\n");
return(FILE_OPENING_ERROR);
}
else
{
while((fgets(s,1023,config_file_pointer))!=(char *)0)
{
p=strrchr(s,'.');
if(p!=NULL)
{
p=strtok(s,t);
flag=0;
//for loop used for checking duplicate names
for(i=0;i<giant_file_counter;i++)
{
if(strcmp(p,GIANT_FILENAMES[i].name)==0)
flag=1;
}//end of for
if(flag==0)
{
strcpy(GIANT_FILENAMES[giant_file_counter].name,p);
giant_file_counter++;
}
}//end of if
}//end of while
}//end of else of if used for checking configuration file pointer not null

printf("\nTotal giant files in replay configuration file are : ");
for(i=0;i<giant_file_counter;i++)
{
printf("\nFile name : %s",GIANT_FILENAMES[i].name);
fflush(stdout);
}
logheader=(log_header *)malloc(sizeof(log_header));
req=(scsi_cmd_req *)malloc(sizeof(scsi_cmd_req));
resp=(scsi_cmd_resp *)malloc(sizeof(scsi_cmd_resp));
///////////////////Loop for scanning all the giant file and splitting them
for(splitter_cnt=0;splitter_cnt!=giant_file_counter;splitter_cnt++)
{
maxlength=0;
curr_pos=0;
file_counter=1;
strcpy(input_file_name,GIANT_FILENAMES[splitter_cnt].name);
input_file_pointer=open(input_file_name, O_RDONLY | O_LARGEFILE);
response_pointer=open(input_file_name, O_RDONLY | O_LARGEFILE);
if(input_file_pointer < 0 || response_pointer<0)
{
printf("\nFile doesn't exist or Error in opening file %s\n",input_file_name);
return(FILE_OPENING_ERROR);
}
//for loop use for initializing the file pointer structure
//This structure is used to store file discriptors of splitted files
for(i=0;i<200;i++)
{
file_pointer[i].flag=0;
file_pointer[i].policy_id=0;
}
// islogfile() returns negative value when file is not valid log file
//but the program must be continue for other log files. so if negative
//it directly send to end of for. for this GOTO is used.

i=islogfile(input_file_pointer,response_pointer,input_file_name);
if(i<0)
{
// goto ff;
}
lseek64(input_file_pointer,i,SEEK_SET);
printf("\n\nSplitting for giant file %s started. Please wait....",input_file_name);
fflush(stdout);
///////main while loop starting here///////////
while(1)
{
////while for searching requests starts here
while(1)
{
printf("\nIn while loop of request searching");
req_flag=0;
curReqLoc=lseek64(input_file_pointer,0,SEEK_CUR);
lseek64(response_pointer,curReqLoc,SEEK_SET);
if(read(input_file_pointer,logheader,sizeof(log_header))==0)
{
for(i=0;i<=maxlength;i++)
close(file_pointer[i].flag);
printf("\nTotal number of newly created file is : %d",file_counter-1);
printf("\nSplitted file names are as follows : ");
for(i=1;i<file_counter;i++)
{
printf("\n%d) %s",i,FILENAMES[i].name);
}
fflush(stdout);
goto zz;
//cant use return as their may be more no. of log files;
// so going out of main while and continuing with giant for loop
}//end of if
//following if is used for checking for request
if(output_options[0]==1)
{
printf("\n Now printing logheader");
printlogheader(logheader);
getchar();
}
if(logheader->is_request==0)
{
lseek64(input_file_pointer,logheader->recordSize - sizeof(log_header),SEEK_CUR);
continue;
}
//follwing if used for set policy id
if(policy==1)
policy_id=logheader->initiator_id;
else
policy_id=logheader->unique_id;

//logic for searching particular file
if(file_pointer[curr_pos].policy_id==policy_id)
goto xx;
for(i=0;i<=maxlength;i++)
{
//printf("\npolicy_id : %llu, file_pointer[i].policy id: %llu",policy_id,file_pointer[i].policy_id);
if(file_pointer[i].policy_id==policy_id)
{
curr_pos=i;
goto xx;
}
}//end of for

curr_pos=maxlength;
xx:
if(file_pointer[curr_pos].flag==0)
{
file_pointer[curr_pos].policy_id=policy_id;
fname=(char *)malloc(sizeof(char)*1024);
temp_fname=(char *)malloc(sizeof(char)*1024);
strcpy(fname,"/nHosts/tmp/split/");
strcpy(temp_fname,input_file_name);
temp_fname=strrchr(temp_fname,'/')+1;
temp_fname=strtok(temp_fname,".");
strcat(fname,temp_fname);

for(i=0;i<mapping_cnt;i++)
{
id=mapping_details[i].unique_id;
if(id==file_pointer[curr_pos].policy_id)
{
strcpy(temp_fname,mapping_details[i].device_name);
temp_fname=strrchr(temp_fname,'/')+1;
break;
}
}//end of for
strcat(fname,"_");
strcat(fname,temp_fname);

if((file_pointer[curr_pos].flag=open(fname, O_CREAT | O_RDWR | O_LARGEFILE)) < 0)
{
printf("\nError in opening file %s. Check the path. Quitting............",fname);
getchar();
return(FILE_OPENING_ERROR);
}
strcpy(FILENAMES[file_counter].name,fname);
file_counter++;
maxlength++;

write(file_pointer[curr_pos].flag,&fileheader,sizeof(file_header));
write(file_pointer[curr_pos].flag,":EOH\n",5);

if(fname)
{
free(fname);
fname=NULL;
}
/*if(temp_fname)
{
printf("\nTest");
getchar();
free(temp_fname);
temp_fname=NULL;
printf("\nTest");
getchar();
}*/
}//end of if
////////////end of searching logic
//now writing record by taking total record size

// buff=(char *)realloc(buff,logheader->recordSize);
buff=(char *)malloc(logheader->recordSize);

if(buff==NULL)
{
printf("\nMalloc error");
exit(MEMORY_ALLOCATION_ERROR);
}
if(output_options[0]==1)
{
printf("\n Logheader->record size = %llu",logheader->recordSize);
getchar();
}
read(response_pointer,buff,logheader->recordSize);
write(file_pointer[curr_pos].flag,buff,logheader->recordSize);
read(input_file_pointer,&ch,sizeof(char));
read(input_file_pointer,req,sizeof(scsi_cmd_req));
if(buff)
{
free(buff);
buff=NULL;
}
break;

}//end of while for searching request

curReqLoc=lseek64(response_pointer,0,SEEK_CUR);
lseek64(input_file_pointer,curReqLoc,SEEK_SET);

while(1)
{
printf("\nIn while loop of response searching");
curReqLoc=lseek64(response_pointer,0,SEEK_CUR);
if(read(response_pointer,logheader,sizeof(log_header))==0)
{
if(req_flag==0)
{
printf("\nWhile searching response logheader size found zero. So no more response found for the request until the file ended. No more requests. So Quittig........\n");
goto zz;
}
else
break;
}
if(logheader->is_request)
{
req_flag=1;
lseek64(response_pointer,logheader->recordSize-sizeof(log_header),SEEK_CUR);
continue;
}

read(response_pointer,&ch,sizeof(char)); // for :
read(response_pointer,resp,sizeof(scsi_cmd_resp));

if(resp->serial != req->serial)
{
lseek64(response_pointer,logheader->recordSize-sizeof(log_header)-sizeof(scsi_cmd_resp)-1,SEEK_CUR);
continue;
}
else
{
//Request response matching
lseek64(response_pointer,curReqLoc,SEEK_SET);
// buff=realloc(buff,logheader->recordSize)
buff=(char *)malloc(200);
if(buff==NULL)
{
printf("\nMalloc error");
exit(MEMORY_ALLOCATION_ERROR);
}
if(output_options[0]==1)
{
printf("\n Logheader->record size = %llu",logheader->recordSize);
getchar();
}
read(response_pointer,buff,200);
write(file_pointer[curr_pos].flag,buff,200);
if(buff)
{
free(buff);
buff=NULL;
}
if(output_options[0]==1)
{
printf("\n Printing");
getchar();
}
break;

}//end of else
}//end of while of searching response
}//end of main while
zz:
printf("\nSplitting completed for given giant file.");
ff:
printf("\n");
}//end of for of giant file loop
///////////////////Loop for scanning all the giant file and splitting them ends here
return(SUCCESS);
}//end of function apply policy