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Plan 9 - man page for read (plan9 section 2)

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READ(2) 										  READ(2)

       read, readn, write - read or write file

       #include <u.h>
       #include <libc.h>

       long read(int fd, void *buf, long nbytes)

       long readn(int fd, void *buf, long nbytes)

       long write(int fd, void *buf, long nbytes)

       Read reads nbytes bytes of data from the offset in the file associated with fd into memory
       at buf.	The offset is advanced by the number of bytes read.  It is  not  guaranteed  that
       all  nbytes bytes will be read; for example if the file refers to the console, at most one
       line will be returned.  In any event the number of characters read is returned.	A  return
       value of 0 is conventionally interpreted as end of file.

       Readn  is just like read, but does successive read calls until nbytes have been read, or a
       read system call returns a non-positive count.

       Write writes nbytes bytes of data starting at buf to the file associated with  fd  at  the
       file  offset.  The offset is advanced by the number of bytes written.  The number of char-
       acters actually written is returned.  It should be regarded as an error if this is not the
       same as requested.


       intro(2), open(2), dup(2), pipe(2)

       These functions set errstr.

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