fchmodat man page on CentOS

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

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

SYNOPSIS
       #include <sys/stat.h>

       int fchmodat(int dirfd, const char *path, 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 path is relative, then it is interpreted rela‐
       tive 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 the pathname given in path is relative  and  dirfd  is  the  special
       value  AT_FDCWD, then path is interpreted relative to the current work‐
       ing directory of the calling process (like chmod(2)).

       If the pathname given in path is absolute, then dirfd is ignored.

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

       AT_SYMLINK_NOFOLLOW
	      If path is a symbolic link, do not dereference it: instead oper‐
	      ate 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
	      path is a relative path and dirfd is a file descriptor referring
	      to a file other than a directory.

       ENOTSUP
	      flags specified AT_SYMLINK_NOFOLLOW, which is not supported.

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

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

VERSIONS
       fchmodat() was added to Linux in kernel 2.6.16.

SEE ALSO
       chmod(2), openat(2), path_resolution(2)

Linux 2.6.16			  2006-05-05			   FCHMODAT(2)
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