Konstantin Belousov 9a6ceacede Implement sighold, sigignore, sigpause, sigrelse, sigset functions
from SUSv4 XSI. Note that the functions are obsoleted, and only
provided to ease porting from System V-like systems. Since sigpause
already exists in compat with different interface, XSI sigpause is
named xsi_sigpause.

Reviewed by:	davidxu
MFC after:	3 weeks
2009-11-26 13:49:37 +00:00
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