Create lchown() in libc and document it as a variation of chown().

2 files changed, 23 insertions, 7 deletions

diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index 47150f1..f08d571 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -1,5 +1,5 @@
 #	@(#)Makefile.inc	8.3 (Berkeley) 10/24/94
-#	$Id: Makefile.inc,v 1.22 1997/02/22 15:03:35 peter Exp $
+#	$Id: Makefile.inc,v 1.23 1997/03/11 11:35:46 peter Exp $
 
 # sys sources
 .PATH: ${.CURDIR}/${MACHINE}/sys ${.CURDIR}/sys
@@ -20,7 +20,7 @@ ASM=	accept.o access.o acct.o adjtime.o bind.o chdir.o chflags.o chmod.o \
 	geteuid.o getfh.o getfsstat.o getgid.o getgroups.o getitimer.o \
 	getpeername.o getpgrp.o getpid.o getppid.o getpriority.o \
 	getrlimit.o getrusage.o getsockname.o getsockopt.o gettimeofday.o \
-	getuid.o ioctl.o kill.o ktrace.o lfs_bmapv.o lfs_markv.o \
+	getuid.o ioctl.o kill.o ktrace.o lchown.o lfs_bmapv.o lfs_markv.o \
 	lfs_segclean.o lfs_segwait.o link.o listen.o lstat.o \
 	madvise.o mincore.o minherit.o mkdir.o mkfifo.o mknod.o mlock.o \
 	mount.o \
diff --git a/lib/libc/sys/chown.2 b/lib/libc/sys/chown.2
index 8cf5422..340d395 100644
--- a/lib/libc/sys/chown.2
+++ b/lib/libc/sys/chown.2
@@ -30,14 +30,15 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     @(#)chown.2	8.4 (Berkeley) 4/19/94
-.\"	$Id$
+.\"	$Id: chown.2,v 1.9 1997/02/22 15:03:44 peter Exp $
 .\"
 .Dd April 19, 1994
 .Dt CHOWN 2
 .Os BSD 4
 .Sh NAME
 .Nm chown ,
-.Nm fchown
+.Nm fchown ,
+.Nm lchown
 .Nd change owner and group of a file
 .Sh SYNOPSIS
 .Fd #include <unistd.h>
@@ -45,6 +46,8 @@
 .Fn chown "const char *path" "uid_t owner" "gid_t group"
 .Ft int
 .Fn fchown "int fd" "uid_t owner" "gid_t group"
+.Ft int
+.Fn lchown "const char *path" "uid_t owner" "gid_t group"
 .Sh DESCRIPTION
 The owner ID and group ID of the file
 named by
@@ -69,12 +72,20 @@ on the file
 to prevent accidental or mischievous creation of
 set-user-id and set-group-id programs if not executed
 by the super-user.
+.Fn chown
+follows symbolic links to operate on the target of the link
+rather than the link itself.
 .Pp
 .Fn Fchown
 is particularly useful when used in conjunction
 with the file locking primitives (see
 .Xr flock 2 ) .
 .Pp
+.Fn Lchown
+is similar to
+.Fn chown
+but does not follow symbolic links.
+.Pp
 One of the owner or group id's
 may be left unchanged by specifying it as -1.
 .Sh RETURN VALUES
@@ -84,6 +95,8 @@ error code being placed in the global variable
 .Va errno .
 .Sh ERRORS
 .Fn Chown
+and
+.Fn lchown
 will fail and the file will be unchanged if:
 .Bl -tag -width Er
 .It Bq Er ENOTDIR
@@ -147,7 +160,10 @@ appeared in
 .Pp
 The
 .Fn chown
-and
-.Fn fchown
-functions were changed to follow symbolic links in
+functions was changed to follow symbolic links in
 .Bx 4.4 .
+The
+.Fn lchown
+function was added in
+.Fx 3.0
+to compensate for the loss of functionality.