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

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

NAME
       iconv_open — codeset conversion allocation function

SYNOPSIS
       #include <iconv.h>

       iconv_t iconv_open(const char *tocode, const char *fromcode);

DESCRIPTION
       The iconv_open() function shall return  a  conversion  descriptor  that
       describes a conversion from the codeset specified by the string pointed
       to by the fromcode argument to the  codeset  specified  by  the	string
       pointed	to  by the tocode argument. For state-dependent encodings, the
       conversion descriptor shall be in  a  codeset-dependent	initial	 shift
       state, ready for immediate use with iconv().

       Settings	 of  fromcode  and tocode and their permitted combinations are
       implementation-defined.

       A conversion descriptor shall  remain  valid  until  it	is  closed  by
       iconv_close() or an implicit close.

       If  a  file descriptor is used to implement conversion descriptors, the
       FD_CLOEXEC flag shall be set; see <fcntl.h>.

RETURN VALUE
       Upon successful completion,  iconv_open()  shall	 return	 a  conversion
       descriptor   for	 use  on  subsequent  calls  to	 iconv().   Otherwise,
       iconv_open() shall return (iconv_t)−1 and set  errno  to	 indicate  the
       error.

ERRORS
       The iconv_open() function may fail if:

       EMFILE All  file	 descriptors  available	 to  the process are currently
	      open.

       ENFILE Too many files are currently open in the system.

       ENOMEM Insufficient storage space is available.

       EINVAL The conversion specified by fromcode and tocode is not supported
	      by the implementation.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       Some implementations of iconv_open() use malloc() to allocate space for
       internal buffer areas. The iconv_open() function may fail if  there  is
       insufficient storage space to accommodate these buffers.

       Conforming applications must assume that conversion descriptors are not
       valid after a call to one of the exec functions.

       Application developers  should  consult	the  system  documentation  to
       determine the supported codesets and their naming schemes.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       iconv(), iconv_close()

       The Base Definitions volume of POSIX.1‐2008, <fcntl.h>, <iconv.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  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  Standard
       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.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			ICONV_OPEN(3P)
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