WRITE(II) 3/15/72 WRITE(II)
NAME
write - write on a file
SYNOPSIS
(write = 4.)
(file descriptor in r0)
sys write; buffer; nbytes
write(fildes, buffer, nbytes)
char *buffer;
DESCRIPTION
A file descriptor is a word returned from a successful open,
creat or pipe call.
Buffer is the address of nbytes contiguous bytes which are
written on the output file. The number of characters
actually written is returned (in r0). It should be regarded
as an error if this is not the same as requested.
Writes which are multiples of 512 characters long and begin
on a 512-byte boundary are more efficient than any others.
SEE ALSO
creat(II), open(II), pipe(II)
DIAGNOSTICS
The error bit (c-bit) is set on an error: bad descriptor,
buffer address, or count; physical I/O errors. From C, a
returned value of -1 indicates an error.