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 .