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uselocale(3) — Linux manual page

uselocale(3)             Library Functions Manualuselocale(3)

NAME        top

       uselocale - set/get the locale for the calling thread

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <locale.h>locale_t uselocale(locale_tnewloc);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):uselocale():           Since glibc 2.10:               _XOPEN_SOURCE >= 700           Before glibc 2.10:               _GNU_SOURCE

DESCRIPTION        top

       Theuselocale() function sets the current locale for the calling       thread, and returns the thread's previously current locale.  After       a successful call touselocale(), any calls by this thread to       functions that depend on the locale will operate as though the       locale has been set tonewloc.       Thenewloc argument can have one of the following values:       A handle returned by a call tonewlocale(3) orduplocale(3) The calling thread's current              locale is set to the specified locale.       The special locale object handleLC_GLOBAL_LOCALEThe calling thread's current locale is set              to the global locale determined bysetlocale(3).(locale_t) 0              The calling thread's current locale is left unchanged (and              the current locale is returned as the function result).

RETURN VALUE        top

       On success,uselocale() returns the locale handle that was set by       the previous call touselocale() in this thread, orLC_GLOBAL_LOCALEif there was no such previous call.  On error, it       returns(locale_t) 0, and setserrno to indicate the error.

ERRORS        top

EINVALnewloc does not refer to a valid locale object.

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       glibc 2.3.  POSIX.1-2008.

NOTES        top

       Unlikesetlocale(3),uselocale() does not allow selective       replacement of individual locale categories.  To employ a locale       that differs in only a few categories from the current locale, use       calls toduplocale(3) andnewlocale(3) to obtain a locale object       equivalent to the current locale and modify the desired categories       in that object.

EXAMPLES        top

       Seenewlocale(3) andduplocale(3).

SEE ALSO        top

locale(1),duplocale(3),freelocale(3),newlocale(3),setlocale(3),locale(5),locale(7)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17uselocale(3)

Pages that refer to this page:duplocale(3), isalpha(3), locale_t(3type), newlocale(3), toupper(3), locale(5), locale(7)

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