Hello Michael, according to mmap.2 on Linux the mapping will be created at a page boundary if addr is not NULL. It remains unclear if this holds true for addr == NULL, too. I have not checked the coding. Maybe only the punctuation is wrong: %s/mapping; on Linux,/mapping. On Linux,/ Best regards Heinrich -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html