signal.h
========

POSIX specification: http://www.opengroup.org/susv3xbd/signal.h.html

Gnulib module: signal

Portability problems fixed by Gnulib:

  * sigset_t is only declared in <sys/types.h> on some platforms: mingw.

  * struct sigaction and siginfo_t are missing on some platforms: mingw.

Portability problems not fixed by Gnulib:

  * struct sigaction lacks the sa_sigaction member on some platforms; this can also be detected by whether SA_SIGINFO is defined: Interix 3.5.