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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 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 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), credentials(7), path_resolution(7)

COLOPHON

       This  page  is  part of release 3.35 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://man7.org/linux/man-pages/.

                                  2010-11-01                     EUIDACCESS(3)