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 (consult the correspond-
       ing 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  fat-
	      tach()-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 Technol-
       ogy -- 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(3P)