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10.1045 sigaltstack

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaltstack.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, Cygwin 1.7.x, mingw, MSVC 14.
• sigaltstack doesn’t work on HP-UX 11/IA-64 and OpenBSD 3.6/Sparc64.