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 .

IEEE/The Open Group                                   2003                                             FCHOWN(P)