[SP/P10] Solved exercises

5 files changed, 157 insertions, 0 deletions

diff --git a/Year 3/System programming/Practice10/ex1.c b/Year 3/System programming/Practice10/ex1.c
new file mode 100644
index 0000000..c04f7dd
--- /dev/null
+++ b/Year 3/System programming/Practice10/ex1.c
@@ -0,0 +1,25 @@
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main() {
+	char msg[] = "hello world";
+
+	int shmd = shm_open("/shmemory", O_RDWR | O_CREAT | O_TRUNC, 0755);
+	ftruncate(shmd, strlen(msg));
+	char* mem = mmap(NULL, strlen(msg) + 1, PROT_READ | PROT_WRITE, MAP_SHARED, shmd, 0);
+
+	strncpy(mem, msg, strlen(msg) + 1);
+
+	char buf[1024];
+	strncpy(buf, mem, strlen(msg) + 1);
+	write(1, buf, strlen(buf) + 1);
+
+	close(shmd);
+	shm_unlink("/shmemory");
+
+	return 0;
+}
diff --git a/Year 3/System programming/Practice10/ex2-1.c b/Year 3/System programming/Practice10/ex2-1.c
new file mode 100644
index 0000000..db839c1
--- /dev/null
+++ b/Year 3/System programming/Practice10/ex2-1.c
@@ -0,0 +1,21 @@
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main() {
+	const char msg[] = "hello world";
+	size_t msglen = strlen(msg);
+
+	int shmd = shm_open("/shm", O_RDWR | O_CREAT | O_TRUNC, 0755);
+	ftruncate(shmd, msglen);
+	char* memory = mmap(NULL, msglen, PROT_WRITE, MAP_SHARED, shmd, 0);
+
+	strncpy(memory, msg, msglen);
+
+	munmap(memory, msglen);
+	close(shmd);
+	return 0;
+}
diff --git a/Year 3/System programming/Practice10/ex2-2.c b/Year 3/System programming/Practice10/ex2-2.c
new file mode 100644
index 0000000..2043360
--- /dev/null
+++ b/Year 3/System programming/Practice10/ex2-2.c
@@ -0,0 +1,24 @@
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main() {
+	const char msg[] = "hello world";
+	size_t msglen = strlen(msg) + 1;
+
+	int shmd = shm_open("/shm", O_RDONLY, 0755);
+	ftruncate(shmd, msglen);
+	char* memory = mmap(NULL, msglen, PROT_READ, MAP_SHARED, shmd, 0);
+
+	char buf[1024];
+	strncpy(buf, memory, msglen);
+	write(1, buf, msglen);
+
+	munmap(memory, msglen);
+	close(shmd);
+	shm_unlink("/shm");
+	return 0;
+}
diff --git a/Year 3/System programming/Practice10/ex3.c b/Year 3/System programming/Practice10/ex3.c
new file mode 100644
index 0000000..0580a38
--- /dev/null
+++ b/Year 3/System programming/Practice10/ex3.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main() {
+	int shmd = shm_open("/shm", O_RDWR | O_TRUNC | O_CREAT, 0755);
+	ftruncate(shmd, sizeof(int));
+	int* memory = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED, shmd, 0);
+
+	*memory = 0;
+
+	int fod = fork();
+	if (fod == 0) {
+		while (*memory < 100) {
+			*memory += 1;
+			printf("%d %d\n", getpid(), *memory);
+			sleep(1);
+		}
+	}
+	else {
+		while (*memory < 100) {
+			sleep(2);
+			*memory += 1;
+			printf("%d %d\n", getpid(), *memory);
+		}
+	}
+
+	munmap(memory, sizeof(int));
+	close(shmd);
+	if (fod != 0)
+		shm_unlink("/shm");
+
+	return 0;
+}
diff --git a/Year 3/System programming/Practice10/ex4.c b/Year 3/System programming/Practice10/ex4.c
new file mode 100644
index 0000000..c0505fb
--- /dev/null
+++ b/Year 3/System programming/Practice10/ex4.c
@@ -0,0 +1,49 @@
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <time.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main() {
+	int shmd = shm_open("/shm", O_RDWR | O_TRUNC | O_CREAT, 0755);
+	ftruncate(shmd, sizeof(int[20]));
+	int* memory = mmap(NULL, sizeof(int[20]), PROT_READ | PROT_WRITE, MAP_SHARED, shmd, 0);
+
+	srand(time(NULL));
+	for (int i = 0; i < 20; i++) {
+		memory[i] = rand() % 100;
+	}
+
+	int fod = fork();
+	if (fod == 0) {
+		for (int i = 0; i < 20; i++) {
+			for (int j = 0; j < 20; j++) {
+				if (memory[i] < memory[j]) {
+					int temp = memory[i];
+					memory[i] = memory[j];
+					memory[j] = temp;
+				}
+			}
+		}
+	}
+	else {
+		while (!waitpid(fod, NULL, WNOHANG)) {
+			for (int i = 0; i < 20; i++) {
+				printf("%d ", memory[i]);
+			}
+			printf("\n");
+		}
+	}
+
+	munmap(memory, sizeof(int[20]));
+	close(shmd);
+	if (fod != 0)
+		shm_unlink("/shm");
+
+	return 0;
+}