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

       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.

       fchown — change owner and group of a file

       #include <unistd.h>

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

       The fchown() function shall be equivalent to chown() except that the file
       whose owner and group are changed is specified by the file descriptor

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

       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

       The following sections are informative.

   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);





       The Base Definitions volume of POSIX.1‐2008, <unistd.h>

       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(3POSIX)