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LCHOWN(3P)                 POSIX Programmer's Manual                LCHOWN(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       lchown - change the owner and group of a symbolic link

SYNOPSIS
       #include <unistd.h>

       int lchown(const char *path, uid_t owner, gid_t group);


DESCRIPTION
       The  lchown()  function  shall  be equivalent to chown(), except in the case where the named file is a symbolic
       link. In this case, lchown() shall change the ownership of the symbolic link file itself, while chown() changes
       the ownership of the file or directory to which the symbolic link refers.

RETURN VALUE
       Upon successful completion, lchown() shall return 0. Otherwise, it shall return -1 and set errno to indicate an
       error.

ERRORS
       The lchown() function shall fail if:

       EACCES Search permission is denied on a component of the path prefix of path.

       EINVAL The owner or group ID is not a value supported by the implementation.

       ELOOP  A loop exists in symbolic links encountered during resolution of the path argument.

       ENAMETOOLONG
              The length of a pathname exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.

       ENOENT A component of path does not name an existing file or path is an empty string.

       ENOTDIR
              A component of the path prefix of path is not a directory.

       EOPNOTSUPP
              The path argument names a symbolic link and the implementation does not support  setting  the  owner  or
              group of a symbolic link.

       EPERM  The  effective  user  ID  does not match the owner of the file and the process does not have appropriate
              privileges.

       EROFS  The file resides on a read-only file system.


       The lchown() function may fail if:

       EIO    An I/O error occurred while reading or writing to the file system.

       EINTR  A signal was caught during execution of the function.

       ELOOP  More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the path argument.

       ENAMETOOLONG
              Pathname resolution of a symbolic link produced an intermediate result whose length exceeds  {PATH_MAX}.


       The following sections are informative.

EXAMPLES
   Changing the Current Owner of a File
       The  following  example shows how to change the ownership of the symbolic link named /modules/pass1 to the user
       ID associated with "jones" and the group ID associated with "cnd".

       The numeric value for the user ID is obtained by using the getpwnam() function.   The  numeric  value  for  the
       group ID is obtained by using the getgrnam() function.


              #include <sys/types.h>
              #include <unistd.h>
              #include <pwd.h>
              #include <grp.h>


              struct passwd *pwd;
              struct group  *grp;
              char          *path = "/modules/pass1";
              ...
              pwd = getpwnam("jones");
              grp = getgrnam("cnd");
              lchown(path, pwd->pw_uid, grp->gr_gid);

APPLICATION USAGE
       On implementations which support symbolic links as directory entries rather than files, lchown() may fail.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       chown(), symlink(), the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  Issue  6,  Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
       Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan-
       dard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                           LCHOWN(3P)