931a725809
with FreeBSD (not including the MINSIGSTKSZ issue, which belongs to Marcel). Due to time constraints, I'm going to space them out over a few days. This fixes two problems with linux_sigaltstack() o ss == 0 is perfectly valid use, so do not fail in this case. o Fix flag handling: - Our SS_DISABLE is 4, linux's is 2, so we need conversion routines. These conversion routines will be needed by linux_rt_sendsig() and linux_rt_sigreturn (forthcoming), so they are not static. - Linux's flag 0 historically meant SS_ONSTACK according to a comment in their linux/kernel/signal.c file. Among other things, this fixes a warning from Sun's JDK 1.3: "Java HotSpot(TM) Client VM warning: cannot uninstall alt signal stack" Reviewed by: marcel Tested by: sto@stat.duke.edu, many others on freebsd-java@