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Diffstat (limited to 'lib/libc/sys/chown.2')
-rw-r--r-- | lib/libc/sys/chown.2 | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/lib/libc/sys/chown.2 b/lib/libc/sys/chown.2 new file mode 100644 index 0000000..11c3956 --- /dev/null +++ b/lib/libc/sys/chown.2 @@ -0,0 +1,148 @@ +.\" Copyright (c) 1980, 1991, 1993, 1994 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" 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. +.\" +.\" @(#)chown.2 8.4 (Berkeley) 4/19/94 +.\" +.Dd April 19, 1994 +.Dt CHOWN 2 +.Os BSD 4 +.Sh NAME +.Nm chown , +.Nm fchown +.Nd change owner and group of a file +.Sh SYNOPSIS +.Fd #include <unistd.h> +.Ft int +.Fn chown "const char *path" "uid_t owner" "gid_t group" +.Ft int +.Fn fchown "int fd" "uid_t owner" "gid_t group" +.Sh DESCRIPTION +The owner ID and group ID of the file +named by +.Fa path +or referenced by +.Fa fd +is changed as specified by the arguments +.Fa owner +and +.Fa group . +The owner of a file may change the +.Fa group +to a group of which +he or she is a member, +but the change +.Fa owner +capability is restricted to the super-user. +.Pp +.Fn Chown +clears the set-user-id and set-group-id bits +on the file +to prevent accidental or mischievous creation of +set-user-id and set-group-id programs. +.Pp +.Fn Fchown +is particularly useful when used in conjunction +with the file locking primitives (see +.Xr flock 2 ) . +.Pp +One of the owner or group id's +may be left unchanged by specifying it as -1. +.Sh RETURN VALUES +Zero is returned if the operation was successful; +-1 is returned if an error occurs, with a more specific +error code being placed in the global variable +.Va errno . +.Sh ERRORS +.Fn Chown +will fail and the file will be unchanged if: +.Bl -tag -width Er +.It Bq Er ENOTDIR +A component of the path prefix is not a directory. +.It Bq Er EINVAL +The pathname contains a character with the high-order bit set. +.It Bq Er ENAMETOOLONG +A component of a pathname exceeded 255 characters, +or an entire path name exceeded 1023 characters. +.It Bq Er ENOENT +The named file does not exist. +.It Bq Er EACCES +Search permission is denied for a component of the path prefix. +.It Bq Er ELOOP +Too many symbolic links were encountered in translating the pathname. +.It Bq Er EPERM +The effective user ID is not the super-user. +.It Bq Er EROFS +The named file resides on a read-only file system. +.It Bq Er EFAULT +.Fa Path +points outside the process's allocated address space. +.It Bq Er EIO +An I/O error occurred while reading from or writing to the file system. +.El +.Pp +.Fn Fchown +will fail if: +.Bl -tag -width Er +.It Bq Er EBADF +.Fa Fd +does not refer to a valid descriptor. +.It Bq Er EINVAL +.Fa Fd +refers to a socket, not a file. +.It Bq Er EPERM +The effective user ID is not the super-user. +.It Bq Er EROFS +The named file resides on a read-only file system. +.It Bq Er EIO +An I/O error occurred while reading from or writing to the file system. +.El +.Sh SEE ALSO +.Xr chown 8 , +.Xr chgrp 1 , +.Xr chmod 2 , +.Xr flock 2 +.Sh STANDARDS +.Fn Chown +is expected to conform to IEEE Std 1003.1-1988 +.Pq Dq Tn POSIX . +.Sh HISTORY +The +.Fn fchown +function call +appeared in +.Bx 4.2 . +.Pp +The +.Fn chown +and +.Fn fchown +functions were changed to follow symbolic links in +.Bx 4.4 . |