FREAD(3S)FREAD(3S)NAME
fread, fwrite - buffered binary input/output
SYNOPSIS
#include <stdio.h>
size_t fread(void *ptr, size_t size, size_t nitems, FILE *stream);
size_t fwrite(void *ptr, size_t size, size_t nitems, FILE *stream);
DESCRIPTION
Fread reads, into a block beginning at ptr, nitems of data of the size
of size from the named input stream. It returns the number of items
actually read.
If stream is stdin and the standard output is line buffered, then any
partial output line will be flushed before any call to read(2) to
satisfy the fread.
Fwrite appends at most nitems of data of the size of size beginning at
ptr to the named output stream. It returns the number of items
actually written.
RETURN VALUE
Fread returns the number of elements successfully read, which may be
less than nitems if a read error or end-of-file is encountered.
Fwrite returns the number of elements successfully written, which may
be less than nitems if a write error is encountered.
ERRORS
The underlying function of fread is read. The underlying function of
fwrite is write. The errors detected for fread and fwrite are those
specified for their respective underlying function.
SEE ALSOread(2), write(2), fopen(3S), getc(3S), putc(3S), gets(3S), puts(3S),
printf(3S), scanf(3S)
August 1, 1992 FREAD(3S)
