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i m looking for answer to a just simple fork question what i am trying to achive is ,that ,when i compile this program below and
hit the enter button to run it like
./exe " findx me "
in ubuntu shell i want this program to find all "me" and all "findx" words in a txt file but !!! i wan to create a new child process for every word in this case =>>>
./exe " findx me "
i want main to do nothing and create 2 child process and those one of them look for "findx" and other one look for "me" words
but i couldnt make it work right i appriciate for all help thanks so much here is code
#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<errno.h>
#include<stdlib.h>
#include<sys/types.h>
#define LINE_LENGTH 180
int makeargv(const char *s,const char *delimiters,char ***argvp);
void freemakeargv(char **argv);
int counttokens(char **myargv,FILE *openedfile,int whichdelimiter);
int main(int argc , char *argv[] )
{
char delim[]=" \t";
int i;
char **myargv;
int numtokens;
int bla=0;
pid_t childpid;
FILE *inputfile;
inputfile=fopen("example.txt","r");
fprintf(stderr," argc is %d !!\n",argc);
printf(" i am process and my id is %ld\n",(long)getpid);
fprintf(stderr," my parents id is %ld but i m in main\n",(long)getppid);
if(inputfile==NULL)
{
fprintf(stderr,"file is not opened exits!!\n");
return 1;
}
fprintf(stderr,"usage :%s , %s , %s , %s strings here\n",argv[0],argv[1],argv[2],argv[3]);
if(argc < 2)
{
fprintf(stderr,"usage :%s strinwwwwwwg\n",argv[0]);
return 1;
}
if((numtokens =makeargv(argv[1],delim,&myargv))==-1)
{
fprintf(stderr,"failed to construct an argumant array for %s \n",argv[1]);
return 1;
}
printf("the argument array containsererer %d is tokens: \n",numtokens);
for(i=0;i<numtokens; i++)
{
printf("\n%d :%s \n",i,myargv[i]);
}
/*işte burayı forklaman lazım !!!*/
for(i=0;i<numtokens;i++)
{
if(childpid=fork())
{
printf(" \ni m %d.thchild process and my id is %ld \n",i,(long)getpid());
printf(" parent ******i m child process and my id is %ld \n",(long)getppid());
bla=counttokens(myargv,inputfile,i);
printf("\n %d tokens total\n",bla);
break ;
}else if(childpid== -1)
{
perror("\n**failed to fork \n");
return 1;
}
}
/*
childpid=fork();
if(childpid== -1)
{
perror("\n**failed to fork \n");
return 1;
}
if(childpid==0)
{
printf(" \ni m child process and my id is %ld \n",(long)getpid());
printf(" parent ******i m child process and my id is %ld \n",(long)getppid());
bla=counttokens(myargv,inputfile,0);
printf("\n %d tokens total\n",bla);
}
else
{
printf("i m parent %ld yoo\n",(long)getpid());
}
*/
freemakeargv(myargv);
fclose(inputfile);
return 0;
}
int makeargv(const char *s,const char *delimiters,char ***argvp)
{
int error;
int i;
int numtokens;
const char *snew;
char *t;
if((s == NULL) || (delimiters==NULL) || (argvp==NULL))
{
errno=EINVAL;
return -1;
}
*argvp=NULL;
snew= s + strspn(s,delimiters);
if((t=malloc(strlen(snew)+1)) ==NULL )
return -1;
strcpy(t,snew);
numtokens=0;
if(strtok(t,delimiters)!= NULL)
for(numtokens=1;strtok(NULL,delimiters) != NULL ; numtokens++);
if((*argvp=malloc((numtokens+1)*sizeof(char *)))==NULL)
{
error =errno;
free(t);
errno=error;
return -1;
}
if(numtokens==0)
free(t);
else
{
strcpy(t,snew);
**argvp=strtok(t,delimiters);
for(i=1;i<numtokens ;i++)
*((*argvp)+i)=strtok(NULL,delimiters);
}
*((*argvp) +numtokens)=NULL;
return numtokens;
}
void freemakeargv(char **argv)
{
if(argv == NULL)
return;
if(*argv != NULL)
free(*argv);
free(argv);
}
int counttokens(char **myargv,FILE *openedfile,int whichdelimiter)
{
char *delimiter;
int lengthOfDelimeter=0;
int error;
char *beginingFileDelimiter;
char *endingFileDelimiter;
/*ikinci bölümün variableları*/
char *extraline;
char line[LINE_LENGTH];
char *status;
int i=0;
int founder=12;
int counter=0;
int linelength=0;
lengthOfDelimeter=strlen(myargv[whichdelimiter]);
//makes new delimeter string!
if((delimiter=malloc((lengthOfDelimeter+3)*sizeof(char *)))==NULL)
{
error =errno;
free(delimiter);
errno=error;
return -1;
}
/*for in middle begin and end of file searching delimiter*/
strncpy(&delimiter[0]," ",1);
strncpy(&delimiter[1],myargv[whichdelimiter],lengthOfDelimeter);
strncpy(&delimiter[lengthOfDelimeter+1]," ",1);
strncpy(&delimiter[lengthOfDelimeter+2],"\0",1);
printf("\n%s-%d\n",delimiter,(int)strlen(delimiter));
/*delimiter belli elimizde dosyada var simdi dosyadan delimiterleri bulup
* main e geri götürmeliyiz*/
/*ilk satırın okunması*/
for(status=fgets(line,LINE_LENGTH,openedfile);
status!=0;
status=fgets(line,LINE_LENGTH,openedfile))
{
if(status == NULL)
{
fprintf(stderr,"theres not anything in file !! exits \n");
return 1;
}/*end if*/
else
{
if(line[strlen(line)-1] == '\n')
line[strlen(line)-1] ='\0';
founder=strncmp(line,&delimiter[1],strlen(delimiter)-1); //it can begin whitout space
linelength=strlen(line);
if(founder==0)
{
printf("%d.th one found \n",++counter);
/*end inner if*/
}
for(i=strlen(delimiter)-2;i<linelength;)
{
founder=12; /*junk deger*/
founder=strncmp(&line[i],delimiter,strlen(delimiter));
if(founder==0)
{
printf("%d.th one found \n",++counter);
i+=strlen(delimiter) -1; /*bulduysa diğer sefere buradan başlayacak*/
}/*end inner if*/
else
{
i++; /*bulamadıysa gelecek sefere hemen bir sonraki karakterden baslacyacak*/
}/*end inner else*/
}/*end for*/
/*may end with bili word*/
if(linelength>=(strlen(delimiter) - 2))
{
founder =12;
/*
founder=strncmp(&line[linelength-(strlen(delimiter)-1)],&delimiter[0],strlen(delimiter)-1); //it can begin whitout space
if(founder==0)
{
printf("%d.th one found \n",++counter);
}
founder=12;
*/
founder=strncmp(&line[linelength-(strlen(delimiter)-2)],&delimiter[1],strlen(delimiter)-2); //it can begin whitout space
if(founder==0)
{
printf("%d.th one found \n",++counter);
}
}
}/*end else*/
} /*end outer for*/
return counter;
}
by the way rest of code is working great i only trying to solve fork part
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