Cygwin currently has sighold(), but not its counterpart sigrelse().
I believe it's implementation should be mainly a matter of copy/pasting:
In exceptions.cc, copy/paste sighold(), s/sighold/sigrelse/, s/sigaddset/sigdelset/
In include/cygwin/signal.h and cygwin.din, copy/paste the sighold line, and s/sighold/sigrelse/.
In include/cygwin/version.h, bump minor API version.
Relevant page of SUSv3: http://www.opengroup.org/onlinepubs/009695399/functions/sighold.html
Thankyou,
Max.
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