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

PROLOG         top

       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         top

       iconv_open — codeset conversion allocation function

SYNOPSIS         top

       #include <iconv.h>

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

DESCRIPTION         top

       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

       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         top

       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

ERRORS         top

       The iconv_open() function may fail if:

       EMFILE All file descriptors available to the process are currently

       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         top



       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         top




SEE ALSO         top

       iconv(3p), iconv_close(3p)

       The Base Definitions volume of POSIX.1‐2008, fcntl.h(0p), iconv.h(0p)

COPYRIGHT         top

       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 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 Standard is the referee document. The original
       Standard can be obtained online at .

       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 .

IEEE/The Open Group                 2013                      ICONV_OPEN(3P)