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

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

       iconv_open - codeset conversion allocation function

       #include <iconv.h>

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

       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-depen-
       dent 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

       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.

       The iconv_open() function may fail if:

       EMFILE {OPEN_MAX} file descriptors are currently open in the calling process.

       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.


       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

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



       iconv(), iconv_close(), the Base Definitions volume of IEEE Std 1003.1-2001, <fcntl.h>, <iconv.h>

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The original Standard can be
       obtained online at .

IEEE/The Open Group                  2003                       ICONV_OPEN(3P)