42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
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// A C program that does not terminate from an interrupt signal.
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// Usually pressing Ctrl-C sends this to the foreground program.
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//
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// To stop this program from running, open another terminal and try
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// > pkill -9 a.out
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// assuming you named the output program a.out
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//
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// This version uses portable signal handler setup
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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// Function run when a signals are caught
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void handle_signals(int sig_num) {
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if(sig_num == SIGINT){
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printf("\nNo SIGINT-erruptions allowed.\n");
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}
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else if(sig_num == SIGTERM){
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printf("\nTry to SIGTERM me? Piss off!\n");
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}
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fflush(stdout);
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}
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int main () {
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// Set handling functions for programs using portable handler setup
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// with sigaction()
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struct sigaction my_sa = {}; // carries information about handler and options
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my_sa.sa_handler = handle_signals; // run function handle_signals
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sigemptyset(&my_sa.sa_mask); // don't block any other signals during handling
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my_sa.sa_flags = SA_RESTART; // restart system calls on signals if possible
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sigaction(SIGTERM, &my_sa, NULL); // register SIGTERM with given action
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sigaction(SIGINT, &my_sa, NULL); // register SIGINT with given action
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// Infinite loop
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while(1) {
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sleep(1);
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printf("Ma-na na-na!\n");
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fflush(stdout);
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}
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return 0;
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}
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