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Plan 9 - man page for read (plan9 section 5)

READ(5) 			       File Formats Manual				  READ(5)

NAME
       read, write - transfer data from and to a file

SYNOPSIS
       Tread   tag[2] fid[2] offset[8] count[2]
       Rread   tag[2] fid[2] count[2] pad[1] data[count]

       Twrite  tag[2] fid[2] offset[8] count[2] pad[1] data[count]
       Rwrite  tag[2] fid[2] count[2]

DESCRIPTION
       The  read request asks for count bytes of data from the file identified by fid, which must
       be opened for reading, starting offset bytes after the beginning of the file.  Count  must
       be  less  than  or equal to MAXFDATA (8192, defined in <fcall.h>).  The bytes are returned
       with the read reply message.

       The count field in the reply indicates the number of bytes returned.   This  may  be  less
       than the requested amount.  If the offset field is greater than the number of bytes in the
       file, a count of zero will be returned.	For directories, read returns an integral  number
       of  directory  entries exactly as in stat (see stat(5)), one for each member of the direc-
       tory.  The read request message must have offset and count zero modulo DIRLEN.

       The write request asks that count bytes of data be recorded in the file identified by fid,
       which  must  be opened for writing, starting offset bytes after the beginning of the file.
       If the file has been opened append only, the data will be placed at the end  of	the  file
       regardless of offset.  Directories may not be written.

       The  write  reply records the number of bytes actually written.	It is usually an error if
       this is not the same as requested.

ENTRY POINTS
       Read and write messages are generated by the corresponding calls.  Because of the MAXFDATA
       limit, more than one message may be produced by a single call.

											  READ(5)


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