setbuf(3p) [suse man page]

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

       setbuf - assign buffering to a stream

SYNOPSIS

       #include <stdio.h>

       void setbuf(FILE *restrict stream, char *restrict buf);

DESCRIPTION

       Except that it returns no value, the function call:

	      setbuf(stream, buf)

       shall be equivalent to:

	      setvbuf(stream, buf, _IOFBF, BUFSIZ)

       if buf is not a null pointer, or to:

	      setvbuf(stream, buf, _IONBF, BUFSIZ)

       if buf is a null pointer.

RETURN VALUE

       The setbuf() function shall not return a value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       A common source of error is allocating buffer space as an "automatic" variable in a code block, and then failing to close the stream in the
       same block.

       With setbuf(), allocating a buffer of BUFSIZ bytes does not necessarily imply that all of BUFSIZ bytes are used for the buffer area.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fopen(), setvbuf(), 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								SETBUF(3P)

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

       setvbuf -- assign buffering to a stream

SYNOPSIS

       #include <stdio.h>

       int setvbuf(FILE *restrict stream, char *restrict buf, int type,
	   size_t size);

DESCRIPTION

       The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here
       and the ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard.

       The  setvbuf()  function  may  be used after the stream pointed to by stream is associated with an open file but before any other operation
       (other than an unsuccessful call to setvbuf()) is performed on the stream. The argument type determines how stream shall  be  buffered,	as
       follows:

	*  {_IOFBF} shall cause input/output to be fully buffered.

	*  {_IOLBF} shall cause input/output to be line buffered.

	*  {_IONBF} shall cause input/output to be unbuffered.

       If buf is not a null pointer, the array it points to may be used instead of a buffer allocated by setvbuf() and the argument size specifies
       the size of the array; otherwise, size may determine the size of a buffer allocated by the setvbuf() function. The contents of the array at
       any time are unspecified.

       For information about streams, see Section 2.5, Standard I/O Streams.

RETURN VALUE

       Upon  successful completion, setvbuf() shall return 0. Otherwise, it shall return a non-zero value if an invalid value is given for type or
       if the request cannot be honored, and may set errno to indicate the error.

ERRORS

       The setvbuf() function may fail if:

       EBADF  The file descriptor underlying stream is not valid.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       A common source of error is allocating buffer space as an ``automatic'' variable in a code block, and then failing to close the	stream	in
       the same block.

       With setvbuf(), allocating a buffer of size bytes does not necessarily imply that all of size bytes are used for the buffer area.

       Applications should note that many implementations only provide line buffering on input from terminal devices.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       Section 2.5, Standard I/O Streams, fopen(), setbuf()

       The Base Definitions volume of POSIX.1-2008, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							       SETVBUF(3P)