Operating Systems | Modify this C program so that the writer process passes the output of “ls” command to the upstream end of the pipe. You may use dup2(fds[1],1); for redirection and execlp("ls", "ls", 0); to run the “ls” command. #include #include #include #include #include // main int main(int argc,char *argv[]){ int fds[2]; char buff[60]; int count; int i; pipe(fds); if (fork()==0){ printf("\nWriter on the upstream end of the pipe -> %d arguments \n",argc); close(fds[0]); for(i=0;i0){ for(i=0;i
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
// main
int main(int argc,char *argv[]){
int fds[2];
char buff[60];
int count;
int i;
pipe(fds);
if (fork()==0){
printf("\nWriter on the upstream end of the pipe -> %d arguments \n",argc);
close(fds[0]);
for(i=0;i<argc;i++){
write(fds[1],argv[i],strlen(argv[i]));
}
exit(0);
}
else if(fork()==0){
printf("\nReader on the downstream end of the pipe \n");
close(fds[1]);
while((count=read(fds[0],buff,60))>0){
for(i=0;i<count;i++){
write(1,buff+i,1);
write(1," ",1);
}
printf("\n");
}
exit(0);
}
else{
close(fds[0]);
close(fds[1]);
wait(0);
wait(0);
}
return 0;
}
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