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10.7 _longjmp

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/_longjmp.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This function is missing on some platforms: mingw, MSVC 14.
• POSIX says this function is obsolescent and it is planned to be removed in POSIX 202x.

Note: Despite its being removed from POSIX, in 2023 on all systems which have _setjmp, it is the fastest way to save the registers but not the signal mask (up to 30 times faster than setjmp on some systems).