Manpage of EUIDACCESS

EUIDACCESS

Section: Linux Programmer's Manual (3)
Updated: 2015-03-02
Index
 

NAME

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

SYNOPSIS

#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);
 

DESCRIPTION

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.

modeis 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.  

RETURN VALUE

On success (all requested permissions granted), zero is returned. On error (at least one bit in modeasked for a permission that is denied, or some other error occurred), -1 is returned, and errnois set appropriately.  

ERRORS

As for access(2).  

VERSIONS

The eaccess() function was added to glibc in version 2.4.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
euidaccess(), eaccess() Thread safetyMT-Safe
 

CONFORMING TO

These functions are nonstandard. Some other systems have an eaccess() function.  

NOTES

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_EACCESSand AT_SYMLINK_NOFOLLOW.  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO

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