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Unix Version 7 - man page for write (v7 section 2)

WRITE(2)					 System Calls Manual					     WRITE(2)

NAME
write - write on a file
SYNOPSIS
write(fildes, buffer, nbytes) char *buffer;
DESCRIPTION
A file descriptor is a word returned from a successful open, creat, dup, or pipe(2) call. Buffer is the address of nbytes contiguous bytes which are written on the output file. The number of charac- ters actually written is returned. 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 in the file are more effi- cient than any others.
SEE ALSO
creat(2), open(2), pipe(2)
DIAGNOSTICS
Returns -1 on error: bad descriptor, buffer address, or count; physical I/O errors.
ASSEMBLER
(write = 4.) (file descriptor in r0) sys write; buffer; nbytes (byte count in r0) WRITE(2)


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