Function BasicOpenFile

src/backend/storage/file/fd.c:1066–1070

* Open a file with BasicOpenFilePerm() and pass default file mode for the * fileMode parameter. */

 * fileMode parameter.
 */
int
BasicOpenFile(const char *fileName, int fileFlags)
{
	return BasicOpenFilePerm(fileName, fileFlags, pg_file_create_mode);
}

/*
 * BasicOpenFilePerm --- same as open(2) except can free other FDs if needed