[SP/P08] Solved exercises

6 files changed, 138 insertions, 0 deletions

diff --git a/Year 3/System programming/Practice08/ex1.c b/Year 3/System programming/Practice08/ex1.c
new file mode 100644
index 0000000..63ee62e
--- /dev/null
+++ b/Year 3/System programming/Practice08/ex1.c
@@ -0,0 +1,16 @@
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main() {
+	signal(SIGPIPE, SIG_IGN);
+
+	int filedes[2];
+	pipe(filedes);
+	close(filedes[0]);
+
+	write(filedes[1], "aba\n", 4);
+	write(1, "mnm\n", 4);
+
+	return 0;
+}
diff --git a/Year 3/System programming/Practice08/ex2.c b/Year 3/System programming/Practice08/ex2.c
new file mode 100644
index 0000000..c8e783e
--- /dev/null
+++ b/Year 3/System programming/Practice08/ex2.c
@@ -0,0 +1,20 @@
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+
+void sigpipeHandle(int a) {
+	printf("handler\n");
+}
+
+int main() {
+	signal(SIGPIPE, sigpipeHandle);
+
+	int filedes[2];
+	pipe(filedes);
+	close(filedes[0]);
+
+	write(filedes[1], "aba\n", 4);
+	write(1, "mnm\n", 4);
+
+	return 0;
+}
diff --git a/Year 3/System programming/Practice08/ex3.c b/Year 3/System programming/Practice08/ex3.c
new file mode 100644
index 0000000..6dafe40
--- /dev/null
+++ b/Year 3/System programming/Practice08/ex3.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+void usr1Handler(int a) {
+}
+
+int main() {
+	signal(SIGUSR1, &usr1Handler);
+
+	int fp = fork();
+	if (fp == 0) { // child
+		printf("child\n");
+		kill(getppid(), SIGUSR1);
+	}
+	else {
+		pause();
+		printf("child finished\n");
+	}
+
+	return 0;
+}
diff --git a/Year 3/System programming/Practice08/ex4.c b/Year 3/System programming/Practice08/ex4.c
new file mode 100644
index 0000000..882282b
--- /dev/null
+++ b/Year 3/System programming/Practice08/ex4.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+int counter = 0;
+
+void sigalarmHandler(int a) {
+	printf("%d\n", counter);
+	alarm(1);
+}
+
+int main() {
+	signal(SIGALRM, &sigalarmHandler);
+	alarm(1);
+	while (1) counter++;
+
+	return 0;
+}
diff --git a/Year 3/System programming/Practice08/ex5.c b/Year 3/System programming/Practice08/ex5.c
new file mode 100644
index 0000000..fa5f648
--- /dev/null
+++ b/Year 3/System programming/Practice08/ex5.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+int counter = 0;
+
+void sigalarmHandler(int a) {
+	printf("%d\n", counter);
+	alarm(1);
+}
+
+void sigintHandler(int a) {
+	printf("int\n");
+	counter = 0;
+}
+
+int main() {
+	signal(SIGALRM, &sigalarmHandler);
+	signal(SIGINT, &sigintHandler);
+
+	alarm(1);
+	while (1) counter++;
+
+	return 0;
+}
diff --git a/Year 3/System programming/Practice08/ex6.c b/Year 3/System programming/Practice08/ex6.c
new file mode 100644
index 0000000..ed46f66
--- /dev/null
+++ b/Year 3/System programming/Practice08/ex6.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+void termHandler(int a) {
+	printf("childterm\n");
+}
+
+int fp = 0;
+
+void alarmHandler(int a) {
+	kill(fp, SIGTERM);
+}
+
+int main() {
+	signal(SIGTERM, &termHandler);
+	signal(SIGALRM, &alarmHandler);
+
+	fp = fork();
+	if (fp == 0) { // child
+		pause();
+		pause();
+	}
+	else {
+		alarm(1);
+		pause();
+		alarm(1);
+		wait(NULL);
+	}
+
+	return 0;
+}