Section: Linux Programmer's Manual (3)
euidaccess, eaccess - check effective user's permissions for a file
#define _GNU_SOURCE /* See feature_test_macros(7) */
int euidaccess(const char *pathname, int mode);
int eaccess(const char *pathname, int mode);
checks permissions and existence of the file identified by its argument
performs checks using the real user and group identifiers of the process,
uses the effective identifiers.
is a mask consisting of one or more of
R_OK, W_OK, X_OK, and F_OK,
with the same meanings as for
is a synonym for
provided for compatibility with some other systems.
On success (all requested permissions granted), zero is returned.
On error (at least one bit in
asked for a permission that is denied, or some other error occurred),
-1 is returned, and
is set appropriately.
function was added to glibc in version 2.4.
For an explanation of the terms used in this section, see
These functions are nonstandard.
Some other systems have an
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
with the flags
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