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@node setjmp
@section @code{setjmp}
@findex setjmp
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/setjmp.html}
Gnulib module: ---
Portability problems fixed by Gnulib:
@itemize
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
POSIX does not specify whether @code{setjmp} saves the signal mask in the
@code{jmp_buf}. It does on BSD platforms, and on glibc platforms when
@code{_BSD_SOURCE} (and/or @code{_DEFAULT_SOURCE} on glibc >= 2.19) is defined;
in this case @code{setjmp} behaves like @code{sigsetjmp(.,1)}, and functions
@code{_setjmp} and @code{_longjmp} are available that don't save or restore
the signal mask. On System V platforms (excluding HP-UX), and on glibc
platforms by default, @code{setjmp} doesn't save the signal mask.
@end itemize
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