With the inclusion of File POSIX Capabilities in Kernel 2.6.24 has Linux finally reached a stage, where POSIX Capabilities are usable and useful.
POSIX capabilities break the root privileges into smaller pieces, and allow tasks to run with only a subset of the root user's privileges. File capabilities allow such privileges to be attached to a program, greatly simplifying the use of capabilities.
Bei linux/solaris macht setjmp nicht das gleiche wie bei BSD. Da sollte man dann lieber _setjmp benutzen. POSIX kompatible ist solcher code trotzdem.