ranjith kumar wrote: > I have one question about sigaction() function. > Suppose in a program sigaction() is called to change the action taken > by the process on receipt of a SIGTRAP signal. > Let us say sigaction function is: > void sig_sigaction(int, siginfo_t *, void *); > When the program hits a trap at address=the contents of register > REGPC(program counter), > let us say the registers are REGPC,REG1,......... > > So when that trap is hit, KERNEL will modify the REGPC to point to > starting address of 'sig_sigaction' function. > But what about other registers and stack?? KERNEL may modify other > registers and may write some thing on stack?? That's right. All the registers are saved in the siginfo_t struct on the stack, and are restored when your sigaction() function returns. But all this is a bit off-topic. > Please ignore me if this question is not related to this group. Why on earth did you cross-post to all these groups? This is never going to be right. Andrew.
