fwrite man page on SunOS

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fwrite(3C)		 Standard C Library Functions		    fwrite(3C)

NAME
       fwrite - binary output

SYNOPSIS
       #include <stdio.h>

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

DESCRIPTION
       The fwrite() function writes, from the array pointed to by ptr,	up  to
       nitems  elements whose size is specified by size, to the stream pointed
       to by stream. For each object, size calls are  made  to	the  fputc(3C)
       function,  taking  the values (in order) from an array of unsigned char
       exactly overlaying the object.  The  file-position  indicator  for  the
       stream  (if  defined)  is  advanced by the number of bytes successfully
       written. If an error occurs, the resulting value of  the	 file-position
       indicator for the stream is unspecified.

       The  st_ctime and st_mtime fields of the file will be marked for update
       between the successful execution of fwrite() and	 the  next  successful
       completion  of a call to fflush(3C) or fclose(3C) on the same stream or
       a call to exit(2) or abort(3C).

RETURN VALUES
       The fwrite() function returns the number of elements successfully writ‐
       ten,  which  might be less than nitems if a write error is encountered.
       If size or nitems is 0, fwrite() returns 0 and the state of the	stream
       remains	unchanged. Otherwise, if a write error occurs, the error indi‐
       cator for the stream is set and errno is set to indicate the error.

ERRORS
       Refer to fputc(3C).

USAGE
       Because of possible differences in element length  and  byte  ordering,
       files  written  using  fwrite() are application-dependent, and possibly
       cannot be read using fread(3C) by a different  application  or  by  the
       same application on a different processor.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       write(2),   fclose(3C),	ferror(3C),  fopen(3C),	 fread(3C),  getc(3C),
       gets(3C), printf(3C), putc(3C), puts(3C), attributes(5), standards(5)

SunOS 5.10			  24 Jul 2002			    fwrite(3C)
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