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Linux 2.6 - man page for lchown (linux section 3posix)

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

       lchown - change the owner and group of a symbolic link

       #include <unistd.h>

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

       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.

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

       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.

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

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

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

	      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.

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

       The following sections are informative.

   Changing the Current Owner of a File
       The following example shows how to change the ownership of the symbolic link  named  /mod-
       ules/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);

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



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

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications 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
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					LCHOWN(P)

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