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9.42 signal.h

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html

Gnulib module: signal-h

Portability problems fixed by Gnulib:

• volatile sig_atomic_t is rejected by older compilers on some platforms: AIX.
• sigset_t is missing on some platforms: MSVC 14.
• sigset_t is only declared in <sys/types.h> on some platforms: mingw.
• struct sigaction and siginfo_t are missing on some platforms: mingw, MSVC 14.
• The type pid_t is not defined on some platforms: MSVC 14.
• The signal SIGPIPE is not defined on some platforms: mingw, MSVC 14.
• The macros SA_RESETHAND and SA_RESTART are not defined on some platforms: NonStop.
• The type sighandler_t (a GNU extension) is not defined on most non-glibc platforms: macOS 11.1, FreeBSD 14.0, NetBSD 10.0, OpenBSD 6.7, AIX 5.1, HP-UX 11, Solaris 11.4, Cygwin, mingw, MSVC 14.

Portability problems not fixed by Gnulib:

• Many signals are not defined on some platforms: mingw, MSVC 14.
• The macro SIGBUS is set to the same value as SIGSEGV, rather than being a distinct signal, on some platforms: Haiku.