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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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euidaccess(3) Library Functions Manual euidaccess(3)
euidaccess, eaccess - check effective user's permissions for a
file
Standard C library (libc, -lc)
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <unistd.h>
int euidaccess(const char *path, int mode);
int eaccess(const char *path, int mode);
Like access(2), euidaccess() checks permissions and existence of
the file identified by its argument path. 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.
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.
As for access(2).
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ euidaccess(), eaccess() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Some other systems have an eaccess() function.
None.
eaccess()
glibc 2.4.
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.
access(2), chmod(2), chown(2), faccessat(2), open(2), setgid(2),
setuid(2), stat(2), credentials(7), path_resolution(7)
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-6.15.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 is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 euidaccess(3)
Pages that refer to this page: access(2), credentials(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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