6.2.1 �⺻ ��

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6.2.1 �⺻ �� (Basic Concepts)

�� ؼ�, ��(Pipe)�� μ�� ǥ�� (Standard output)�� ٸ� ��μ�� ǥ�� Է�(Standard input)�� ϴ� ��̴�. �� IPC�� н� �ü�� ʱ� �ܰ�� Ǿ� �Դ�. �� μ�� ܹ��(��,half-duplex) �� Ѵ�.

�̷�� Ư¡�� н� ��ɾ� ��(��н� ��)�� а� ��ȴ�.

ls | sort | lp

�� ls�� sort�� Է�� ϰ� sort�� lp�� Է�� ϱ� �� (pipe)�� ̿��Ͽ��. �ڷ�� ʿ�� ̵��ϵ��, �� δ�.

�츮�� ũ��Ʈ ��α׷��ֿ�� ϰ� ��Ѵ��ص�, Ŀ�� Ͼ�� Ͽ� ��ؼ�� ʰ� ��Ѵ�.

��μ�� , Ŀ�� ΰ�� ĺ��(descriptor)�� غ��Ѵ�. �Ѱ�� ĺ��(descriptor)�� (Write)�� Է� ��η� ��ǰ� �ٸ� �ϳ�� (Read)�� ڷḦ ��µ� ��ȴ�. �̷� �� ϴ� ��μ�� ڱ��ڽŰ�� ſ�� ʴ´�. �� μ�� Ŀ�� ۿ뿡 ��϶�.

- �ּ��ϰԵ� �� ̾�׷� �׸��
�� ̾�׷�� ĺ��ڵ�� �� Ǵ�� ִ�. ��μ�� (fd0)�� ڷḦ ��ٸ�, fd1�� ڷḦ �� (�� ) �ִ� �ɷ�� ִ�. �׷�� ׸�� 繰�� ſ� ũ��. �� ó�� μ�� ڽ�� ϴ� ��, �� ڷ�� Ŀ�� δ�. Ư�� ȿ�� inode�� ǹ��Ѵ�. ��, �� inode�� Ŀ�ξȿ� ��ϰ� �� ý��ۿ�� ƹ�� ġ�� ʴ´�. �̷�� Ư¡�� 츮�� I/O ��(handy I/O doors)�� ְ� �Ѵ�.

�̷�� . �ᱹ, �츮�� 츮 �ڽſ�� ̾߱��ϰ�� Ѵٸ� �� ߸� �ϴ°�? ��ϴ�(creating) ��μ�� ڽ� ��μ��(child process)�� (fork)�Ѵ�. �ڽ� ��μ�� θ�� ĺ��ڵ� ��ӹ޾��Ƿ� �츮�� θ�� ڽİ�� Ƽ��μ�� ʸ� �� ִ�. �츮�� ׸� �� ϶�.

�� 츮�� μ�� ϴ� �� ĺ��ڿ� �� ִ�. �̹�� ߿�� Ѵ�. � �� ڷᰡ �̵��ϱ⸦ ��ϴ°�? �ڽ� ��μ�� θ𿡰� �� ΰ� �ƴϸ� �� ݴ��ΰ�? �� μ�� ̷�� ȣ ��ϰ� �ְ� ��Ǿ� �� ݴ´�. �� , �ڽ� ��μ��  �۾�� ϰ� �� θ𿡰� �� ϴ�� 캸��. �츮�� Ӱ� ��ȵ� �׸�� Ÿ��.:

�� Ϻ��ϴ�! ��ִ� �� ̴�. �� ϱ� ��, �� I/O�� Ǵ� �� ý�� ȣ�� ִ�. (�� ȿ�� inode�� ǥ�� ϶�)

�� ڷḦ �� , �츮�� write() �ý�� ȣ�� ϰ� �� ڷḦ ��ȸ�ϱ� �� read()�� ý�� ȣ�� Ѵ�. �� I/O �ý�� ȣ�� ĺ��ڸ� �� ۾�� ϶�! ��·��, �� ĺ��ڸ� �� ۾�� ʴ� lseek()�� ý�� ȣ�� ϶�.

��:6.2 �� н� �� ��:6.2.2 C��

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LAST UPDATE Nov 14,1997
Created Nov 14,1997

6.2.1 �⺻ ���� (Basic Concepts)

6.2.1 �⺻ �� (Basic Concepts)