-.TH CHMOD 2 "May 13, 1986"
-.UC 4
-.SH NAME
-chmod \- change mode of file
-.SH SYNOPSIS
-.nf
-.ft B
-chmod(path, mode)
-char *path;
-int mode;
-.PP
-.ft B
-fchmod(fd, mode)
-int fd, mode;
-.fi
-.SH DESCRIPTION
-The file whose name
-is given by \fIpath\fP
-or referenced by the descriptor
-.I fd
-has its mode changed to
-.IR mode .
-Modes are constructed by
-.IR or 'ing
-together some
-combination of the following, defined in
-.IR <sys/inode.h> :
-.PP
-.RS
-.nf
-.ta \w'IWRITE\ \ 'u +\w'04000\ \ \ 'u
-ISUID 04000 set user ID on execution
-ISGID 02000 set group ID on execution
-ISVTX 01000 `sticky bit' (see below)
-IREAD 00400 read by owner
-IWRITE 00200 write by owner
-IEXEC 00100 execute (search on directory) by owner
- 00070 read, write, execute (search) by group
- 00007 read, write, execute (search) by others
-.fi
-.RE
-.PP
-If an executable file is set up for sharing (this is the default)
-then mode ISVTX (the `sticky bit') prevents the system from
-abandoning the swap-space image of the program-text portion
-of the file when its last user terminates.
-Ability to set this bit on executable files is restricted to the super-user.
-.PP
-If mode ISVTX (the `sticky bit') is set on a directory,
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" 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
+.\" SUCH DAMAGE.
+.\"
+.\" @(#)chmod.2 6.6 (Berkeley) 3/10/91
+.\"
+.Dd March 10, 1991
+.Dt CHMOD 2
+.Os BSD 4
+.Sh NAME
+.Nm chmod ,
+.Nm fchmod
+.Nd change mode of file
+.Sh SYNOPSIS
+.Fd #include <sys/stat.h>
+.Ft int
+.Fn chmod "const char *path" "mode_t mode"
+.Ft int
+.Fn fchmod "int fd" "mode_t mode"
+.Sh DESCRIPTION
+The function
+.Fn chmod
+sets the file permission bits
+of the file
+specified by the pathname
+.Fa path
+to
+.Fa mode .
+.Fn Fchmod
+sets the permission bits of the specified
+file descriptor
+.Fa fd .
+.Fn Chmod
+verifies that the process owner (user) either owns
+the file specified by
+.Fa path
+(or
+.Fa fd ) ,
+or
+is the super-user.
+A mode is created from
+.Em or Ap d
+permission bit masks
+defined in
+.Aq Pa sys/stat.h :
+.Bd -literal -offset indent -compact
+#define S_IRWXU 0000700 /* RWX mask for owner */
+#define S_IRUSR 0000400 /* R for owner */
+#define S_IWUSR 0000200 /* W for owner */
+#define S_IXUSR 0000100 /* X for owner */
+
+#define S_IRWXG 0000070 /* RWX mask for group */
+#define S_IRGRP 0000040 /* R for group */
+#define S_IWGRP 0000020 /* W for group */
+#define S_IXGRP 0000010 /* X for group */
+
+#define S_IRWXO 0000007 /* RWX mask for other */
+#define S_IROTH 0000004 /* R for other */
+#define S_IWOTH 0000002 /* W for other */
+#define S_IXOTH 0000001 /* X for other */
+
+#define S_ISUID 0004000 /* set user id on execution */
+#define S_ISGID 0002000 /* set group id on execution */
+#define S_ISVTX 0001000 /* save swapped text even after use */
+.Ed
+.Pp
+The
+.Dv ISVTX
+(the
+.Em sticky bit )
+indicates to the system which executable files are shareable (the
+default) and the system maintains the program text of the files
+in the swap area. The sticky bit may only be set by the super user
+on shareable executable files.
+.Pp
+If mode
+.Dv ISVTX
+(the `sticky bit') is set on a directory,
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