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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

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

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

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

	   Since glibc 2.10:
	       _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
	   Before glibc 2.10:

       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

	      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  facces‐
       sat().  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;	 library  support  was
       added to glibc in version 2.4.


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

       Warning: faccessat() is subject to the same kinds of races as access(2)
       and euidaccess(3).

   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_resolu‐
       tion(7), symlink(7)

       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/.

Linux				  2012-05-04			  FACCESSAT(2)

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