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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 dif-
       fer (consult 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 privi-
       leges.


              #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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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(3P)