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lib/libc/sys/chmod.2
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||||
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||||
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||||
.\" SUCH DAMAGE. | .\" SUCH DAMAGE. | ||||
.\" | .\" | ||||
.\" @(#)chmod.2 8.1 (Berkeley) 6/4/93 | .\" @(#)chmod.2 8.1 (Berkeley) 6/4/93 | ||||
.\" $FreeBSD$ | .\" $FreeBSD$ | ||||
.\" | .\" | ||||
.Dd September 23, 2020 | .Dd February 23, 2021 | ||||
.Dt CHMOD 2 | .Dt CHMOD 2 | ||||
.Os | .Os | ||||
.Sh NAME | .Sh NAME | ||||
.Nm chmod , | .Nm chmod , | ||||
.Nm fchmod , | .Nm fchmod , | ||||
.Nm lchmod , | .Nm lchmod , | ||||
.Nm fchmodat | .Nm fchmodat | ||||
.Nd change mode of file | .Nd change mode of file | ||||
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are constructed by a bitwise-inclusive OR of flags from the following list, defined | are constructed by a bitwise-inclusive OR of flags from the following list, defined | ||||
in | in | ||||
.In fcntl.h : | .In fcntl.h : | ||||
.Bl -tag -width indent | .Bl -tag -width indent | ||||
.It Dv AT_SYMLINK_NOFOLLOW | .It Dv AT_SYMLINK_NOFOLLOW | ||||
If | If | ||||
.Fa path | .Fa path | ||||
names a symbolic link, then the mode of the symbolic link is changed. | names a symbolic link, then the mode of the symbolic link is changed. | ||||
.It Dv AT_BENEATH | |||||
Only allow to change permissions of a file which is beneath of | |||||
the topping directory. | |||||
See the description of the | |||||
.Dv O_BENEATH | |||||
flag in the | |||||
.Xr open 2 | |||||
manual page. | |||||
.It Dv AT_RESOLVE_BENEATH | .It Dv AT_RESOLVE_BENEATH | ||||
Only walks paths below the topping directory. | Only walk paths below the directory specified by the | ||||
.Ar fd | |||||
descriptor. | |||||
markj: s/walks/walk/, "the directory" | |||||
See the description of the | See the description of the | ||||
.Dv O_RESOLVE_BENEATH | .Dv O_RESOLVE_BENEATH | ||||
flag in the | flag in the | ||||
.Xr open 2 | .Xr open 2 | ||||
manual page. | manual page. | ||||
.El | .El | ||||
.Pp | .Pp | ||||
If | If | ||||
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.Dv AT_FDCWD | .Dv AT_FDCWD | ||||
nor a file descriptor associated with a directory. | nor a file descriptor associated with a directory. | ||||
.It Bq Er ENOTCAPABLE | .It Bq Er ENOTCAPABLE | ||||
.Fa path | .Fa path | ||||
is an absolute path, | is an absolute path, | ||||
or contained a ".." component leading to a | or contained a ".." component leading to a | ||||
directory outside of the directory hierarchy specified by | directory outside of the directory hierarchy specified by | ||||
.Fa fd , | .Fa fd , | ||||
and the process is in capability mode. | and the process is in capability mode or the | ||||
.It Bq Er ENOTCAPABLE | .Dv AT_RESOLVE_BENEATH | ||||
The | flag was specified. | ||||
.Dv AT_BENEATH | |||||
flag was provided to | |||||
.Fn fchmodat , | |||||
and the absolute | |||||
.Fa path | |||||
does not have its tail fully contained under the topping directory, | |||||
or the relative | |||||
.Fa path | |||||
escapes it. | |||||
.El | .El | ||||
.Sh SEE ALSO | .Sh SEE ALSO | ||||
.Xr chmod 1 , | .Xr chmod 1 , | ||||
.Xr chflags 2 , | .Xr chflags 2 , | ||||
.Xr chown 2 , | .Xr chown 2 , | ||||
.Xr open 2 , | .Xr open 2 , | ||||
.Xr stat 2 , | .Xr stat 2 , | ||||
.Xr sticky 7 | .Xr sticky 7 | ||||
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s/walks/walk/, "the directory"