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[MiNT] Modification of stack in sig_mach.c


I have a technical question in sig_mach.c for mint.

In function sendsig() there a calculation for change stack position, I understand the principle but I not understand value put in this line:

newstack = ((long) &newcurrent) - 0x40 - 12;

what are 0x40 and 12 values? With what do correspond these values?