fchmodat() - Unix, Linux System Call
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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 );
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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 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 the pathname given in path is relative and
dirfd is the special value
AT_FDCWD, then
path is interpreted relative to the current working
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:
| Tag | Description |
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AT_SYMLINK_NOFOLLOW |
If
path is a symbolic link, do not dereference it:
instead operate on the link itself.
This flag is not currently implemented.
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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():
| Tag | Description |
|---|
|
EBADF |
dirfd is not a valid file descriptor.
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EINVAL |
Invalid flag specified in
flags. |
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ENOTDIR |
path is a relative path and
dirfd is a file descriptor referring to a file other than a directory.
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ENOTSUP |
flags specified
AT_SYMLINK_NOFOLLOW, which is not supported.
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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
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