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FACCESSAT(2)               Linux Programmer's Manual              FACCESSAT(2)

       faccessat - check user's permissions of a file relative to a directory file descriptor

       #define _ATFILE_SOURCE
       #include <fcntl.h> /* Definition of AT_* constants */
       #include <unistd.h>

       int faccessat(int dirfd, const char *pathname, int mode, int flags);

       The faccessat() system call operates in exactly the same way as access(2), except for the differences described
       in this manual page.

       If the pathname given in pathname is relative, then it is interpreted relative to the directory referred to  by
       the  file descriptor dirfd (rather than relative to the current working directory of the calling process, as is
       done by access(2) for a relative pathname).

       If pathname is relative and dirfd is the special value AT_FDCWD, then pathname is interpreted relative  to  the
       current working directory of the calling process (like access(2)).

       If pathname is absolute, then dirfd is ignored.

       flags is constructed by ORing together zero or more of the following values:

              Perform access checks using the effective user and group IDs.  By default, faccessat() uses the real IDs
              (like access(2)).

              If pathname is a symbolic link, do not dereference it: instead return information about the link itself.

       On  success,  (all requested permissions granted) faccessat() returns 0.  On error, -1 is returned and errno is
       set to indicate the error.

       The same errors that occur for access(2) can also occur for faccessat().  The following additional  errors  can
       occur for faccessat():

       EBADF  dirfd is not a valid file descriptor.

       EINVAL Invalid flag specified in flags.

              pathname is relative and dirfd is a file descriptor referring to a file other than a directory.

       faccessat() was added to Linux in kernel 2.6.16.


       See openat(2) for an explanation of the need for faccessat().

   Glibc Notes
       The  AT_EACCESS  and  AT_SYMLINK_NOFOLLOW  flags are actually implemented within the glibc wrapper function for
       faccessat().  If either of these flags are specified, then the wrapper function employs fstatat(2) to determine
       access permissions.

       access(2), openat(2), euidaccess(3), credentials(7), path_resolution(7), symlink(7)

       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at

Linux                             2008-08-21                      FACCESSAT(2)