Unix/Linux Go Back    

Linux 2.6 - man page for faccessat (linux section 2)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

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  path-

       If  pathname  is relative and dirfd is the special value AT_FDCWD, then pathname is inter-
       preted 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,  facces-
	      sat() 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; 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 wrap-
       per 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 3.55 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at

Linux					    2012-05-04				     FACCESSAT(2)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums

All times are GMT -4. The time now is 04:56 AM.