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CentOS 7.0 - man page for eaccess (centos section 3)

EUIDACCESS(3)			    Linux Programmer's Manual			    EUIDACCESS(3)

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.

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

       eaccess() is a synonym for euidaccess(), provided for compatibility with some  other  sys-
       tems.

RETURN VALUE
       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 appropriately.

ERRORS
       As for access(2).

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

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_EACCESS and AT_SYMLINK_NOFOLLOW.

SEE ALSO
       access(2),  chmod(2), chown(2), faccessat(2), open(2), setgid(2), setuid(2), stat(2), cre-
       dentials(7), path_resolution(7)

COLOPHON
       This page is part of release 3.53 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at
       http://www.kernel.org/doc/man-pages/.

					    2010-11-01				    EUIDACCESS(3)


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