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

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This commit is contained in:
Peter Wemm 1997-03-31 12:37:35 +00:00
parent a91b87211d
commit 30493bb81b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=24443
2 changed files with 23 additions and 7 deletions
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4
lib/libc/sys/Makefile.inc
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@ -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 \

26
lib/libc/sys/chown.2
View file

@ -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.