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 permissions 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
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                                   2003                                             FCHMOD(P)