5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/setjmp.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
16 POSIX does not specify whether @code{setjmp} saves the signal mask in the
17 @code{jmp_buf}. It does on BSD platforms, and on glibc platforms when
18 @code{_BSD_SOURCE} (and/or @code{_DEFAULT_SOURCE} on glibc >= 2.19) is defined;
19 in this case @code{setjmp} behaves like @code{sigsetjmp(.,1)}, and functions
20 @code{_setjmp} and @code{_longjmp} are available that don't save or restore
21 the signal mask. On System V platforms (excluding HP-UX), and on glibc
22 platforms by default, @code{setjmp} doesn't save the signal mask.