Library /sys$common/syshlp/helplib.hlb  —  CRTL  sigsetjmp  Description
    The sigsetjmp function saves its calling environment in its env
    argument for later use by the siglongjmp function.

    If the value of savemask is not 0 (zero), sigsetjmp also
    saves the process's current signal mask as part of the calling
    environment.

    See also siglongjmp.
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