[SP/P05] Solved exercises

1 files changed, 34 insertions, 0 deletions

diff --git a/Year 3/System programming/Practice05/ex2.c b/Year 3/System programming/Practice05/ex2.c
new file mode 100644
index 0000000..85ce0dd
--- /dev/null
+++ b/Year 3/System programming/Practice05/ex2.c
@@ -0,0 +1,34 @@
+#include <unistd.h> // fork, write, close, sleep
+#include <fcntl.h> // open
+#include <stdio.h> // perror
+
+int main(int argc, char* argv[]) {
+	int file = open("test.txt", O_WRONLY);
+	if (file < 0) {
+		perror("open");
+		return 1;
+	}
+	pid_t f = fork();
+
+	if (f == 0) { // in child
+		char buf = 'c';
+		for (int i = 0; i < 5; i++) {
+			sleep(2);
+			if(write(file, &buf, 1) < 0) {
+				perror("write");
+				return 2;
+			}
+		}
+	}
+	else {
+		char buf = 'p';
+		for (int i = 0; i < 5; i++) {
+			if(write(file, &buf, 1) < 0) {
+				perror("write");
+				return 3;
+			}
+			sleep(1);
+		}
+	}
+	close(file);
+}