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10.7 _longjmp

Removed in POSIX.1-2024. POSIX.1-2017 specification:

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

Note: Despite its being removed from POSIX, in 2024 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).