fwrite(3c) [sunos man page]

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 written, 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
       indicator 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)

FWRITE(3P)						     POSIX Programmer's Manual							FWRITE(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       fwrite - binary output

SYNOPSIS

       #include <stdio.h>

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

DESCRIPTION

       The fwrite() function shall write, 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 shall be made to the fputc() 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) shall be 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 shall be marked for update between the successful execution of fwrite() and the next success-
       ful completion of a call to fflush() or fclose() on the same stream, or a call to exit() or abort().

RETURN VALUE

       The fwrite() function shall return the number of elements successfully written, which may be less than nitems if a write error  is  encoun-
       tered.  If  size or nitems is 0, fwrite() shall return 0 and the state of the stream remains unchanged. Otherwise, if a write error occurs,
       the error indicator for the stream shall be set,  and errno shall be set to indicate the error.

ERRORS

       Refer to fputc().

       The following sections are informative.

EXAMPLES

       None.

APPLICATION 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() by a different application or by the same application on a different processor.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       ferror(), fopen(), printf(), putc(), puts(), write(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								FWRITE(3P)