adding latex

bac2/os/chap1/ex1.c

@@ -1 +1,27 @@
+#include <bits/types/siginfo_t.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+typedef struct sigaction SIGS;
+
+int counter = 0;
+
+void handler(int sig, siginfo_t* info, void* context) {
+	if (sig == SIGUSR1){
+		counter++;
+		printf("Hello!\n");
+	}else if ( sig == SIGUSR2 ){
+		printf("%d\n", counter);
+		abort();
+	}
+}
+
+int main(int argc, char *argv[]){
+	SIGS context = {.sa_flags = SA_SIGINFO, .sa_sigaction = handler};
+	while(1)
+		pause();
+	return 0;
+}