fread.3s

unix v7是最后一个广泛发布的研究型UNIX版本

.TH FREAD 3S 
.SH NAME
fread, fwrite \- buffered binary input/output
.SH SYNOPSIS
.B #include <stdio.h>
.PP
.B fread(ptr, sizeof(*ptr), nitems, stream)
.br
.SM
.B FILE
.B *stream;
.PP
.B fwrite(ptr, sizeof(*ptr), nitems, stream)
.br
.SM
.B FILE
.B *stream;
.SH DESCRIPTION
.I Fread
reads, into a block beginning at
.I ptr,
.I nitems
of data of the type of
.I *ptr
from the named input
.IR stream .
It returns the number of items actually read.
.PP
.I Fwrite
appends at most
.I nitems
of data of the type of
.I *ptr
beginning at
.I ptr
to the named output
.IR stream .
It returns the number of items actually written.
.SH "SEE ALSO"
read(2), write(2),
fopen(3),
getc(3), putc(3),
gets(3), puts(3),
printf(3), scanf(3)
.SH DIAGNOSTICS
.I Fread
and
.I fwrite
return
0
upon end of file or error.