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FCHMOD(P)			    POSIX Programmer's Manual				FCHMOD(P)

NAME
       fchmod - change mode of a file

SYNOPSIS
       #include <sys/stat.h>

       int fchmod(int fildes, mode_t mode);

DESCRIPTION
       The  fchmod()  function	shall be equivalent to chmod() except that the file whose permis-
       sions are changed is specified by the file descriptor fildes.

       If fildes references a shared memory object, the fchmod() function need	only  affect  the
       S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP, S_IROTH, and S_IWOTH file permission bits.

       If fildes references a typed memory object, the behavior of fchmod() is unspecified.

       If fildes refers to a socket, the behavior of fchmod() is unspecified.

       If  fildes  refers to a STREAM (which is fattach()-ed into the file system name space) the
       call returns successfully, doing nothing.

RETURN VALUE
       Upon successful completion, fchmod() shall return 0. Otherwise, it shall return -1 and set
       errno to indicate the error.

ERRORS
       The fchmod() 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 and the process does not
	      have appropriate privilege.

       EROFS  The file referred to by fildes resides on a read-only file system.

       The fchmod() function may fail if:

       EINTR  The fchmod() function was interrupted by a signal.

       EINVAL The value of the mode argument is invalid.

       EINVAL The fildes argument refers to a pipe and the implementation disallows execution  of
	      fchmod() on a pipe.

       The following sections are informative.

EXAMPLES
   Changing the Current Permissions for a File
       The  following example shows how to change the permissions for a file named /home/cnd/mod1
       so that the owner and group have read/write/execute permissions, but the  world	only  has
       read/write permissions.

	      #include <sys/stat.h>
	      #include <fcntl.h>

	      mode_t mode;
	      int    fildes;
	      ...
	      fildes = open("/home/cnd/mod1", O_RDWR);
	      fchmod(fildes, S_IRWXU | S_IRWXG | S_IROTH | S_IWOTH);

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       chmod()	, chown() , creat() , fcntl() , fstatvfs() , mknod() , open() , read() , stat() ,
       write() , the Base Definitions volume of IEEE Std 1003.1-2001, <sys/stat.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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					FCHMOD(P)
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