Using the C code given below modify it so that,

1) the parent process results from the child

2) and add filtering/aggregation.

C code:

#include

#include

#include

#include

#include

int main(int argc, char * argv[]) {

int pipe1[2];

pid_t childPID;

char buffer;

if (argc != 2) {

fprintf(stderr, "Usage: %s ", argv[0]);

exit(EXIT_FAILURE);

}

if (pipe(pipe1) == -1) {

fprintf(stderr, "%s", "pipe has failed. ");

exit(EXIT_FAILURE);

}

childPID = fork();

if (childPID == -1) {

fprintf(stderr, "%s", "fork has failed. ");

exit(EXIT_FAILURE);

}

if (childPID == 0) {

printf("I am the child. ");

close(pipe1[1]);

printf("Child is about to read from the pipe. ");

while (read(pipe1[0], &buffer, 1) > 0)

write(STDOUT_FILENO, &buffer, 1);

write(STDOUT_FILENO, " ", 1);

close(pipe1[0]);

printf("Child has echoed from the pipe to standard output. ");

exit(EXIT_SUCCESS);

}

else {

printf("I am the parent. ");

close(pipe1[0]);

write(pipe1[1], argv[1], strlen(argv[1]));

close(pipe1[1]);

printf("Parent has written data into the pipe. ");

printf("Parent will wait for child to terminate. ");

wait(NULL);

exit(EXIT_SUCCESS);

}

return 0;

}