91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <signal.h>
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extern void inf_loop();
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void register_handlers();
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void register_alt_stack();
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int main(int argc, char** argv){
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fprintf(stderr, "Entering ... \n");
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register_handlers();
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register_alt_stack();
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inf_loop();
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fprintf(stderr, "Done\n");
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return 0;
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}
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#if 0
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#include <signal.h>
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struct sigaction {
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union {
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void (*__sa_handler)(int);
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void (*__sa_sigaction)(int, struct __siginfo *, void *);
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} __sigaction_u; /* signal handler */
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int sa_flags; /* see signal options below */
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sigset_t sa_mask; /* signal mask to apply */
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};
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#define sa_handler __sigaction_u.__sa_handler
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#define sa_sigaction __sigaction_u.__sa_sigaction
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int
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sigaction(int sig, const struct sigaction * restrict act,
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struct sigaction * restrict oact);
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#endif
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void handler(int signo, struct __siginfo* info, ucontext_t* uap){
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fprintf(stderr, "Handler Called!\n");
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}
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void
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register_handlers(){
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struct sigaction sa;
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sa.sa_sigaction = (void(*)(int,struct __siginfo*,void*)) handler;
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sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
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sa.sa_mask = 0;
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int err = sigaction(SIGINT, &sa, 0);
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if(err){
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fprintf(stderr, "Sigaction Failed: %s\n", strerror(errno));
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exit(-1);
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}
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}
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#if 0
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SYNOPSIS
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#include <sys/types.h>
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#include <signal.h>
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struct sigaltstack {
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char *ss_sp;
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int ss_size;
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int ss_flags;
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};
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int
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sigaltstack(const struct sigaltstack *ss, struct sigaltstack *oss);
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#endif
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void
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register_alt_stack(){
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char* stk = malloc(SIGSTKSZ);
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if(stk == 0){
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fprintf(stderr, "Cannot maloc an alt stack\n");
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exit(-1);
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}
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struct sigaltstack sa;
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sa.ss_sp = stk;
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sa.ss_size = SIGSTKSZ;
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sa.ss_flags = 0;
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int err = sigaltstack(&sa, 0);
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if(err){
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fprintf(stderr, "Cannot set alt stack: %s\n", strerror(errno));
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exit(-1);
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}
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fprintf(stderr, "alt-stack of size %d set\n", SIGSTKSZ);
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}
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