• NAME
  
  fread, fwrite - binary stream input/output
• SYNOPSIS
  

  
   #include <stdio.h>
  
   size_t fread(void * ptr , size_t  size , size_t  nmemb , FILE * stream );
  
  
      size_t fwrite(const void * ptr , size_t  size , size_t  nmemb ,                 FILE * stream ); 

• DESCRIPTION
  
  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 non-locking counterparts, see
  unlocked_stdio(3) .
  
• RETURN VALUE
  
  fread ()
  and
  fwrite ()
  return the number of items successfully read or written (i.e., not the
  number of characters).
  If an error occurs, or the end-of-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.
  
• CONFORMING TO
  
  C89, POSIX.1-2001.
  
• SEE ALSO
  
  read(2) ,
  write(2) ,
  feof(3) ,
  ferror(3) ,
  unlocked_stdio(3)
  
• COLOPHON
  
  This page is part of release 3.19 of the Linux
  man-pages
  project.
  A description of the project,
  and information about reporting bugs,
  can be found at
  http://www.kernel.org/doc/man-pages/.
  

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