FREAD
Section: Standard I/O Functions (3S)
Updated: August 1, 1992
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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 ALSO
read(2),
write(2),
fopen(3S),
getc(3S),
putc(3S),
gets(3S),
puts(3S),
printf(3S),
scanf(3S)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- SEE ALSO
-
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