fchmodat

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

#define _ATFILE_SOURCE
#include <sys/stat.h>
 I int fchmodat(int  dirfd , const char * pathname , mode_t  \
mode ", int " flags );

The R 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 R 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 R AT_FDCWD , then pathname is interpreted relative to the current working directory of the calling process (like chmod(2)). If R pathname is absolute, then dirfd is ignored. flags can either be 0, or include the following flag:

AT_SYMLINK_NOFOLLOW

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

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

EBADF

EINVAL

ENOTDIR

ENOTSUP

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

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

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

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