функция распределения преобразования кодового набора (codeset conversion allocation function)
Пролог (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.
Имя (Name)
iconv_open — codeset conversion allocation function
Синопсис (Synopsis)
#include <iconv.h>
iconv_t iconv_open(const char *tocode, const char *fromcode);
Описание (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>.
Возвращаемое значение (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.
Ошибки (Error)
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.
Примеры (Examples)
None.
Использование в приложениях (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.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
iconv(3p), iconv_close(3p)
The Base Definitions volume of POSIX.1‐2017, fcntl.h(0p),
iconv.h(0p)
