FREAD(3) manual page
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fread, fwrite - binary stream
input/output
#include <stdio.h>
size_t fread(void *ptr, size_t size, size_t nmembFILE *" stream );
size_t fwrite(const void *ptr, size_t size, size_t nmemb,
FILE *stream);
The function fread() reads nmemb elements of data,
each size bytes long, from the stream pointed to by stream, storing them
at the location given by ptr.
The function fwrite() writes nmemb elements
of data, each size bytes long, to the stream pointed to by stream, obtaining
them from the location given by ptr.
For nonlocking counterparts, see unlocked_stdio(3)
.
On success, fread() and fwrite() return the number of items
read or written. This number equals the number of bytes transferred only
when size is 1. If an error occurs, or the end of the file is reached, the
return value is a short item count (or zero).
fread() does not distinguish
between end-of-file and error, and callers must use feof(3)
and ferror(3)
to determine which occurred.
C89, POSIX.1-2001.
read(2)
,
write(2)
, feof(3)
, ferror(3)
, unlocked_stdio(3)
This page is part
of release 3.78 of the Linux man-pages project. A description of the project,
information about reporting bugs, and the latest version of this page,
can be found at http://www.kernel.org/doc/man-pages/.
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