(libc.info.gz) I/O Concepts

Info Catalog (libc.info.gz) I/O Overview (libc.info.gz) File Names
 
 11.1 Input/Output Concepts
 ==========================
 
 Before you can read or write the contents of a file, you must establish
 a connection or communications channel to the file.  This process is
 called "opening" the file.  You can open a file for reading, writing, or
 both.
 
    The connection to an open file is represented either as a stream or
 as a file descriptor.  You pass this as an argument to the functions
 that do the actual read or write operations, to tell them which file to
 operate on.  Certain functions expect streams, and others are designed
 to operate on file descriptors.
 
    When you have finished reading to or writing from the file, you can
 terminate the connection by "closing" the file.  Once you have closed a
 stream or file descriptor, you cannot do any more input or output
 operations on it.
 

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* Streams and File Descriptors    The GNU C Library provides two ways
 			             to access the contents of files.
* File Position                   The number of bytes from the
                                      beginning of the file.
 
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