fchmod(2)                      DG/UX R4.11MU05                     fchmod(2)


NAME
       fchmod - change mode of file

SYNOPSIS
       #include <sys/stat.h>

       int  fchmod (fildes, mode)
       int  fildes;
       int  mode;

   where:
       fildes    File descriptor

       mode      File's new mode

DESCRIPTION
       Fildes is a valid, active descriptor referring to an open file of
       type ordinary, directory, block special, or character special, or
       symbolic link.  The file must reside on a file system device mounted
       read-write.  Fchmod changes the file's mode (stmode) in a manner
       semantically identical to the way chmod does.

ACCESS CONTROL
       The calling process must have appropriate privilege or the effective
       user id of the calling process must match the user id of the file.
       For systems supporting the DG/UX Capability Option, appropriate
       privilege is defined as having one or more specific capabilities
       enabled in the effective capability set of the calling process.  See
       capdefaults(5) for the default capability for this system call.

       On systems without the DG/UX Capability Option, appropriate privilege
       means that the process has an effective UID of root.  See the
       appropriateprivilege(5) man page for more information.

       The calling process must have appropriate privilege to set the sticky
       bit.  To set the set-group-id bit, the calling process must have
       appropriate privilege or its effective group id must match the file's
       group id.  Failure to meet the requirements for setting one of these
       bits does not produce an error.  Note that meeting the first access
       requirement is sufficient to allow a process to set the set-user-id
       bit.

RETURN VALUE
       0      The file's mode was successfully changed.

       -1     An error occurred.  errno is set to indicate the error.

DIAGNOSTICS
       Errno may be set to one of the following error codes:

       EBADF     Fildes is not a valid, active file descriptor.

       EINVAL    The file descriptor refers to a pipe or an object that is
                 not a file.

       EPERM     The process is denied permission to change the file's mode.

       EROFS     The named file resides on a file system device mounted
                 read-only.

SEE ALSO
       chmod(1), chmod(2), chown(2), creat(2), fchown(2), fcntl(2),
       fstat(2), mknod(2), mknod(2), open(2), read(2), stat(2), write(2),
       appropriateprivilege(5).
       capdefaults(5).


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