hi,
i have a program that needs to connect 3 programs through a pipe.
program1 stdout > stdin program2 stdout >stdin program 3.
i have so far created the following code below. iam just stuck on how to add the 3rd program and create a pipe to program 3
any suggestions to point me in the right direction would be great.
thanks heaps.
Code:#include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <stdio.h> int main() { int pid,pid2 ; int fd[2]; pipe(fd); if( (pid = fork() ) == -1 ) { perror("fork"); exit(1); } /* child */ if ( pid == 0 ) { close(fd[1]); dup(fd[0]); // sets stdin to this end of pipe close(fd[0]); execlp( "./prog1", "prog1", NULL ); /* and run */ perror("execlp"); exit(1); } /* parent waits then reports */ if ( pid != 0 ) { close(fd[0]); dup(fd[1]); // sets stdout to this end of pipe close(fd[1]); execlp("./prog2", "prog2", NULL); wait(NULL); } }
