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Yaakov Selkowitz 5c78499ae2 Feature test macros overhaul: signal.h
Use proper internal macros for BSD sig_t and GNU sighandler_t.

sigaltstack and friends are XSI even in SUSv4 but in glibc are
nonetheless handled as POSIX.1-2008 (not 2001).

The requirement for the ucontext_t typedef in signal.h was XSI prior to
POSIX.1-2008.

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>
2016-03-17 21:09:03 -05:00
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