2.9BSD/usr/man/man2/read.2

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.TH READ 2 
.UC
.SH NAME
read \- read from file
.SH SYNOPSIS
.B read(fildes, buffer, nbytes)
.br
.B char *buffer;
.br
.B unsigned nbytes;
.SH DESCRIPTION
A file descriptor is a word
returned from a successful
.I "open, creat, dup,"
or
.IR pipe (2)
call.
.I Buffer
is the location of
.I nbytes
contiguous
bytes into which the input will be placed.
It is not guaranteed
that all
.I nbytes
bytes will be read; for example
if the file refers to a typewriter at most one line
will be returned.
In any event the number of characters read is returned.
.PP
If the returned value is 0, then
end-of-file has been reached.
.SH ERRORS
.I Read
will fail if one or more of the following is true:
.TP 20
[EBADF]
.I Fildes
is not a valid file descriptor open for reading.
.TP 20
[EFAULT]
.I Buf
points outside the process's allocated address space.
.TP 20
[EINTR]
A read from a slow device was interrupted (before any data arrived) by
the delivery of a signal.
.SH "SEE ALSO"
creat(2), dup(2), open(2), pipe(2)
.SH ASSEMBLER
(read = 3.)
.br
(file descriptor in r0)
.br
.B sys read; buffer; nbytes
.br
(byte count in r0)