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@node sigaltstack
@section @code{sigaltstack}
@findex sigaltstack
POSIX specification: @url{http://www.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:
Cygwin, mingw, Interix 3.5, BeOS.
@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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