@node sigaltstack
@section @code{sigaltstack}
@findex sigaltstack

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaltstack.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, Cygwin 1.7.x, mingw, MSVC 14.
@item
@code{sigaltstack} doesn't work on HP-UX 11/IA-64 and OpenBSD
3.6/Sparc64.
@item
This function interprets the @code{ss_sp} member of @code{stack_t} as
the upper bound instead of the lower bound of the alternate stack on
some platforms:
IRIX 6.5
@end itemize
