Specify a file name

The file name argument of mi_file_open() identifies the operating-system file to open. This file name is relative to the server computer. You can include an environment variable in the file name path for the mi_file_open() and mi_file_to_file() file-access functions. This environment variable must be set in the database server environment; that is, it must be set before the database server starts.

For example, the following code snippet shows an mi_file_open() call that opens the operating-system file data_file1, which is in the directory that the DATA_FILES environment variable specifies.
Figure 1: Sample call to open an operating-system file
fd = mi_file_open("$DATA_FILES/data_file1", 
   O_WRONLY | O_APPEND | O_CREAT, 0644);
Suppose the DATA_FILES environment variable is set to the following directory in the database server environment: 
/usr/local/app/load_files
The call to mi_file_open() in Sample call to open an operating-system file opens the following file: 
/usr/local/app/load_files/data_file1