fchmodat — change permissions of a file relative to a directory file descriptor
#define _ATFILE_SOURCE #include <sys/stat.h>
int
fchmodat( |
int | dirfd, |
| const char * | pathname, | |
| mode_t | mode, | |
| int | flags); |
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_NOFOLLOWIf pathname
is a symbolic link, do not dereference it: instead
operate on the link itself. This flag is not currently
implemented.
On success, 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
fchmodat(). The following
additional errors can occur for fchmodat():
dirfd is not
a valid file descriptor.
Invalid flag specified in flags.
pathname is
relative and dirfd is a file
descriptor referring to a file other than a
directory.
ENOTSUPflags
specified AT_SYMLINK_NOFOLLOW, which is not
supported.
This system call is non-standard but is proposed for inclusion in a future revision of POSIX.1.
chmod(2), openat(2), path_resolution(2)
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