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NAME

       fchmodat  -  change  permissions of a file relative to a directory file
       descriptor

SYNOPSIS

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

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

DESCRIPTION

       The fchmodat()  system  call  operates  in  exactly  the  same  way  as
       chmod(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 chmod(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 chmod(2)).

       If pathname is absolute, then dirfd is ignored.

       flags can either be 0, or include the following flag:

       AT_SYMLINK_NOFOLLOW
              If pathname is a symbolic link, do not dereference  it:  instead
              operate  on  the  link  itself.   This  flag  is  not  currently
              implemented.

RETURN VALUE

       On success, fchmodat() returns 0.  On error, -1 is returned  and  errno
       is set to indicate the error.

ERRORS

       The  same errors that occur for chmod(2) can also occur for fchmodat().
       The following additional errors can occur for fchmodat():

       EBADF  dirfd is not a valid file descriptor.

       EINVAL Invalid flag specified in flags.

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

       ENOTSUP
              flags specified AT_SYMLINK_NOFOLLOW, which is not supported.

VERSIONS

       fchmodat() was added to Linux in kernel 2.6.16.

CONFORMING TO

       This  system  call  is  non-standard but is proposed for inclusion in a
       future revision of POSIX.1.

NOTES

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

SEE ALSO

       chmod(2), openat(2), path_resolution(7)

COLOPHON

       This page is part of release 2.77 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/.