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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,  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 original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .