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



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

NAME
       fchown - change owner and group of a file

SYNOPSIS
       #include <unistd.h>

       int fchown(int fildes, uid_t owner, gid_t group);


DESCRIPTION
       The  fchown() function shall be equivalent to chown() except that the file whose owner and group are changed is specified
       by the file descriptor fildes.

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

ERRORS
       The fchown() function shall fail if:

       EBADF  The fildes argument is not an open file descriptor.

       EPERM  The effective user ID does not match the owner of the file or the process does not have appropriate privilege  and
              _POSIX_CHOWN_RESTRICTED indicates that such privilege is required.

       EROFS  The file referred to by fildes resides on a read-only file system.


       The fchown() function may fail if:

       EINVAL The  owner  or  group  ID is not a value supported by the implementation.  The fildes argument refers to a pipe or
              socket  or an fattach()-ed STREAM and the implementation disallows execution of fchown() on a pipe.

       EIO    A physical I/O error has occurred.

       EINTR  The fchown() function was interrupted by a signal which was caught.


       The following sections are informative.

EXAMPLES
   Changing the Current Owner of a File
       The following example shows how to change the owner of a file named /home/cnd/mod1 to "jones" and the group to "cnd".

       The numeric value for the user ID is obtained by extracting the user ID from the  user  database  entry  associated  with
       "jones".   Similarly,  the  numeric value for the group ID is obtained by extracting the group ID from the group database
       entry associated with "cnd". This example assumes the calling program has appropriate privileges.


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


              struct passwd *pwd;
              struct group  *grp;
              int            fildes;
              ...
              fildes = open("/home/cnd/mod1", O_RDWR);
              pwd = getpwnam("jones");
              grp = getgrnam("cnd");
              fchown(fildes, pwd->pw_uid, grp->gr_gid);

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       chown(), 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,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (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   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                    FCHOWN(3P)