status.i4.v = fm_write_disable([vun.i2.r])
This routine allows the programmer to disable writing to all files.
A message will instead be written to a log file. If "vun" is
specified, only that connection will be disabled.
[vun] virtual unit number on which the file was opened
(default is NULL)
This function returns status values as follows:
CBS_NO_SUCH no such file exists
TRUE writing was previously enabled
FALSE writing was not previously enabled
This function requires the following include files:
cnsparam_h, cbslib_h, acnet_errors_h
fm_write_enable, fm_is_writing_enabled, fm_write(_c)
status = fm_write_disable(&vun);