euidaccess(3) — Справочная страница Linux

euidaccess(3)           Library Functions Manual           euidaccess(3)

ИМЯ

       euidaccess, eaccess - check effective user's permissions for a
       file

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #define _GNU_SOURCE             /* See feature_test_macros(7) */
       #include <unistd.h>

       int euidaccess(const char *pathname, int mode);
       int eaccess(const char *pathname, int mode);

ОПИСАНИЕ

       Like access(2), euidaccess() checks permissions and existence of
       the file identified by its argument pathname.  However, whereas
       access(2) performs checks using the real user and group
       identifiers of the process, euidaccess() uses the effective
       identifiers.

       mode is a mask consisting of one or more of R_OK, W_OK, X_OK, and
       F_OK, with the same meanings as for access(2).

       eaccess() is a synonym for euidaccess(), provided for
       compatibility with some other systems.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       On success (all requested permissions granted), zero is returned.
       On error (at least one bit in mode asked for a permission that is
       denied, or some other error occurred), -1 is returned, and errno
       is set to indicate the error.

ОШИБКИ

       As for access(2).

АТРИБУТЫ

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ euidaccess(), eaccess()             │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

ВЕРСИИ

       Some other systems have an eaccess() function.

СТАНДАРТЫ

       None.

ИСТОРИЯ

       eaccess()
              glibc 2.4.

ПРИМЕЧАНИЯ

       Warning: Using this function to check a process's permissions on
       a file before performing some operation based on that information
       leads to race conditions: the file permissions may change between
       the two steps.  Generally, it is safer just to attempt the
       desired operation and handle any permission error that occurs.

       This function always dereferences symbolic links.  If you need to
       check the permissions on a symbolic link, use faccessat(2) with
       the flags AT_EACCESS and AT_SYMLINK_NOFOLLOW.

СМОТРИТЕ ТАКЖЕ

       access(2), chmod(2), chown(2), faccessat(2), open(2), setgid(2),
       setuid(2), stat(2), credentials(7), path_resolution(7)

КОЛОФОН

       This page is part of the man-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-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  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 is not
       part of the original manual page), send a mail to
       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02                  euidaccess(3)

Страницы, которые ссылаются на эту страницу: access(2), credentials(7)