fread(3s) [bsd man page]

FREAD(3S)																 FREAD(3S)

NAME

       fread, fwrite - buffered binary input/output

SYNOPSIS

       #include <stdio.h>

       fread(ptr, sizeof(*ptr), nitems, stream)
       FILE *stream;

       fwrite(ptr, sizeof(*ptr), nitems, stream)
       FILE *stream;

DESCRIPTION

       Fread reads, into a block beginning at ptr, nitems of data of the type of *ptr 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 type of *ptr beginning at ptr to the named output stream.  It returns the number of items
       actually written.

SEE ALSO

       read(2), write(2), fopen(3S), getc(3S), putc(3S), gets(3S), puts(3S), printf(3S), scanf(3S)

DIAGNOSTICS

       Fread and fwrite return 0 upon end of file or error.

4th Berkeley Distribution					   May 15, 1985 							 FREAD(3S)

FREAD(3)						   BSD Library Functions Manual 						  FREAD(3)

NAME

     fread, fwrite -- binary stream input/output

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdio.h>

     size_t
     fread(void *restrict ptr, size_t size, size_t nitems, FILE *restrict stream);

     size_t
     fwrite(const void *restrict ptr, size_t size, size_t nitems, FILE *restrict stream);

DESCRIPTION

     The function fread() reads nitems objects, each size bytes long, from the stream pointed to by stream, storing them at the location given by
     ptr.

     The function fwrite() writes nitems objects, each size bytes long, to the stream pointed to by stream, obtaining them from the location given
     by ptr.

RETURN VALUES

     The functions fread() and fwrite() advance the file position indicator for the stream by the number of bytes read or written.  They return
     the number of objects read or written.  If an error occurs, or the end-of-file is reached, the return value is a short object count (or
     zero).

     The function fread() does not distinguish between end-of-file and error; callers must use feof(3) and ferror(3) to determine which occurred.
     The function fwrite() returns a value less than nitems only if a write error has occurred.

SEE ALSO

     read(2), write(2)

STANDARDS

     The functions fread() and fwrite() conform to ISO/IEC 9899:1990 (``ISO C90'').

BSD
								   March 8, 1994							       BSD