#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<fcntl.h>
#include<ctype.h>
#include<sys/types.h>
#include<sys/stat.h>


int main(int argc, char *args[])
{
	int pipesDescriptors1[2];
	int pipesDescriptors2[2];
	int child1, child2, child3;
	int fileDescriptor;
	int fileDescriptorCount;
	int readFile;
	int readFileCount;
	int lowerLetters = 0;
	char charRead;


	if ( ( pipe(pipesDescriptors1)) < 0 )
	{
		printf("Eroare la teava 1");
		exit(0);
	}

	if ( ( pipe(pipesDescriptors2)) < 0 )
	{
		printf("Eroare la teava 2");
		exit(0);
	}

	if ( ( child1 = fork()) < 0 )
	{
		printf("Eroare la fork");
		exit(0);
	}


	if ( (fileDescriptor = open (args[1], O_RDONLY)) < 0 )
	{
		printf("Can't open file for reading");
		exit(0);
	}

	if ( child1 == 0 ) //codul fiului 1
	{
		close(pipesDescriptors2[0]);
		close(pipesDescriptors2[1]);

		close(pipesDescriptors1[0]); //inchid capatul de citire.
		while ( (readFile = read(fileDescriptor, &charRead, sizeof(charRead))) > 0)
		{
			 if ( isupper(charRead) || islower(charRead) )
			 {
				 if ( (write(pipesDescriptors1[1],&charRead, readFile)) > 0 )
			 	 {
					printf("Error writing to pipe");
					exit(0);
				 }
		         }
		}

		close(pipesDescriptors1[1]); //inchid capatul de scriere

		exit(0);
	}
	else
	{
		if ( (readFileCount = open (args[1], O_RDONLY) ) < 0 )
		{
			printf("Error reading to file!");
			exit(0);
		}

		while ( (fileDescriptorCount = read(fileDescriptor, &charRead, sizeof(charRead))) > 0)
		{
			 if ( islower(charRead))
			 {
				lowerLetters++;
		         }
		}

		exit(lowerLetters);
	}

	if ( (child2 = fork()) < 0 ) //codul fiului 2
	{
		close(pipesDescriptors1[1]); //inchid teava 1 pentru scriere.
		close(pipesDescriptors2[0]); // inchid teava 2 pentru citire

		while ( (read (pipesDescriptors1[0], &charRead, sizeof(charRead))) > 0 )
		{
			//if (
		}

		printf("Eroare la fork 2");
		exit(0);
	}

	if ( child2 == 0 )
	{

		exit(0);
	}

	if ( (child3 = fork()) < 0 )
	{
		printf("Eroare la fork3");
		exit(0);
	}

	if ( child3 == 0 ) //codul fiului 3
	{
		//
		exit(0);
	}

}

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<fcntl.h>
#include<ctype.h>
#include<sys/types.h>
#include<sys/stat.h>

int main (int argc, char *args[])
{
	int teava1[2];
	int teava2[2];
	int pid1, pid2, pid3;


	int pid_a, int pid_b;
	if ( (pipe (teava1)) < 0 )
	{
		printf("Eroare la deschiderea tevii 1");
		exit(0);
	}

	if ( (pipe (teava2)) < 0 )
	{
		printf("Eroare la deschidrea tevii 2");
		exit(0);
	}

	if ( (pid1 = fork()) < 0 )
	{
		printf("Eroare la fork in copilul 1");
		exit(0);
	}

	if ( pid1 == 0 )
	{
		exit(0);
	}

	if ( (pid2 = fork()) < 0 )
	{
		printf("Eroare fork in copilul 2");
		exit(0);
	}

	if ( pid2 == 0 )
	{
		exit(0);
	}

	if ( (pid3 = fork()) < 0 )
	{
		printf("Eroare fork in copilul 3");
		exit(0);
	}
	if ( pid3 == 0 )
	{
		exit(0);
	}
}