PIPE

#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <errno.h>
#define MSGSIZE 512

int main()
{
    char inbuf[MSGSIZE];
    int p[2], pid, nbytes, filesize, filepos;
    DIR           *d;
    struct dirent *dir;
    FILE *curr;
    FILE *new;
    int status;
    char *filename;
    char *bytes = (char *)calloc(MSGSIZE,sizeof(char));

    if (pipe(p) < 0)
    {
        exit(1);
    }

        int i = chdir("/home/ira/osisp/6/images/test");
    d = opendir( "." );

    if( d == NULL )
    {
        printf("Cannot open dir");
            exit(EXIT_FAILURE);
    }

    while( ( dir = readdir( d ) ) )
    {

            if( strcmp( dir->d_name, "." ) == 0 ||
            strcmp( dir->d_name, ".." ) == 0 )
            {
            continue;
            }
        filename = dir->d_name;
        printf("%s \n",filename);  // ASDFGHJKL;LASKLKAAK
        curr = fopen(dir->d_name,"rb");
        if (curr == NULL)
        {
                printf("Error opening file");
                exit(EXIT_FAILURE);
            }

        fseek(curr,0, SEEK_END);
        filesize = ftell(curr);
        fseek(curr,0,SEEK_SET);

        filepos =0;
        while(filepos != filesize)
        {
            if(filesize-filepos > MSGSIZE)
            {
                fread(bytes,sizeof(char), MSGSIZE, curr);
                write(p[1], bytes, MSGSIZE);
                filepos = filepos + MSGSIZE;
            }
            else
            {
                fread(bytes,sizeof(char),filesize-filepos,curr);
                write(p[1], bytes, filesize-filepos);
                fclose(curr);
                //printf("Wrote 1 file \n");
                break;
            }

        }


        //if((pid = fork()) > 0)
        //{
        //  waitpid(-1,&status,WUNTRACED);
        //}

        pid_t pid = fork();
        //if(pid > 0 )
        //{
        //  wait(&status);
        //}
        if(pid == 0)
        {
            int reading_bytes = 0;
            chdir("/home/ira/osisp/6/images/out");
            new = fopen(filename,"wb");
            while(reading_bytes != filesize)
            {
                if(filesize-reading_bytes > MSGSIZE)
                {

                    read(p[0], bytes, MSGSIZE);
                    fwrite(bytes,sizeof(char),MSGSIZE,new);
                    reading_bytes = reading_bytes + MSGSIZE;
                }
                else
                {
                    read(p[0], bytes,filesize-reading_bytes);
                    fwrite(bytes,sizeof(char),filesize-reading_bytes,new);
                    fclose(new);
                    char *path = (char *)calloc(40,sizeof(char));
                    strcpy(path,"/home/ira/osisp/6/images/out");
                    strcat(path,filename);
                    int i =execl("select_channel"," ",path, NULL);
                    printf("%d \n", i);
                    printf("%d \n", errno);
                    //printf("Red 1 file \n");
                    break;

                }

            }

            exit(0);

        }


    }

    //if ((pid > 0) && (WIFEXITED(status)) )
        //{
    //  while(wait(&status) != -1);

        //}

    return 0;
}