[SP/P5] Added solutions to some exercises from today

1 files changed, 41 insertions, 0 deletions

diff --git a/Year 3/System programming/Practicum5/ex4.c b/Year 3/System programming/Practicum5/ex4.c
new file mode 100644
index 0000000..682376d
--- /dev/null
+++ b/Year 3/System programming/Practicum5/ex4.c
@@ -0,0 +1,41 @@
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/wait.h>
+
+int main() {
+	int f1 = open("read.txt", O_RDONLY);
+	if (f1 < 0) {
+		perror("open read.txt");
+		return 1;
+	}
+
+	int f2 = open("write.txt", O_CREAT | O_WRONLY | O_APPEND, 0755);
+	if (f2 < 0) {
+		perror("open write.txt");
+		return 1;
+	}
+
+	pid_t fpid = fork();
+	if (fpid < 0) {
+		perror("fork");
+		return 2;
+	}
+
+	if (fpid == 0) { // child
+		char buff[3];
+		for (int i = 0; i < 6; i++) {
+			read(f1, buff, 3);
+			write(f2, buff, 3);
+			sleep(1);
+		}
+	}
+	else {
+		int status = -2;
+		while (status == -2) {
+			sleep(2);
+			write(f2, "abc", 3);
+			waitpid(fpid, &status, WNOHANG);
+		}
+	}
+}