PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

FCHOWN(3P)                POSIX Programmer's Manual               FCHOWN(3P)

PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior), or
       the interface may not be implemented on Linux.

NAME         top

       fchown — change owner and group of a file

SYNOPSIS         top

       #include <unistd.h>

       int fchown(int fildes, uid_t owner, gid_t group);

DESCRIPTION         top

       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         top

       Upon successful completion, fchown() shall return 0. Otherwise, it
       shall return −1 and set errno to indicate the error.

ERRORS         top

       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 privileges 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         top

   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         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       chown(3p)

       The Base Definitions volume of POSIX.1‐2008, unistd.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                          FCHOWN(3P)