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zad1.c
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zad1.c
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#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
//https://stackoverflow.com/questions/25261/set-and-oldset-in-sigprocmask
void handle_signal(int signum) {
printf("Handling SIGUSR1 with signal function...\n");
}
void sigaction_signal_handler(int signum) {
printf("Handling with sigaction function...\n");
}
int main(int argc, char *argv[]) {
// Expecting 1 argument from command line
if (argc != 2) {
printf("Wrong number of arguments! Program only accepts one argument!\n");
return 1;
}
if (strcmp(argv[1], "none") == 0) { // signal will be handled in default way
signal(SIGUSR1, SIG_DFL);
}
else if (strcmp(argv[1], "ignore") == 0) { // signal will be ignored
signal(SIGUSR1, SIG_IGN);
}
else if (strcmp(argv[1], "handle") == 0) { // signal will be handled in custom way, by executing handler function
signal(SIGUSR1, handle_signal);
}
else if (strcmp(argv[1], "mask") == 0) { // signal will be masked
// Block SIGUSR1
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGUSR1);
if (sigprocmask(SIG_SETMASK, &mask, NULL) == -1) {
perror("sigprocmask");
return 1;
}
raise(SIGUSR1);
// checks if blocked signal is visible //TODO: nie dziala
sigset_t sigset;
if (sigpending(&sigset) != 0) {
perror("sigpending() error");
}
else if (sigismember(&sigset, SIGUSR1)) {
printf("SIGUSR1 signal is pending\n");
}
else {
printf("no signals are pending\n");
}
}
else if (strcmp(argv[1], "") == 0) {
signal(SIGUSR1, SIG_IGN);
printf("No argument provided! You can provide {none, ignore, handle, mask}\n");
}
else {
signal(SIGUSR1, SIG_IGN);
printf("Wrong argument provided!\n");
}
// sends SIGUSR1 to itself
raise(SIGUSR1);
return 0;
}