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@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
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