[SP/P6] Solved exercises

5 files changed, 136 insertions, 0 deletions

diff --git a/Year 3/System programming/Practicum6/ex1.c b/Year 3/System programming/Practicum6/ex1.c
new file mode 100644
index 0000000..d1950ef
--- /dev/null
+++ b/Year 3/System programming/Practicum6/ex1.c
@@ -0,0 +1,18 @@
+#include <unistd.h>
+#include <stdio.h>
+
+int main() {
+	int fileDes[2];
+	if (pipe(fileDes) < 0) {
+		perror("pipe");
+		return 1;
+	}
+	if (close(fileDes[1]) < 0) {
+		perror("close");
+		return 2;
+	}
+	char buf;
+	read(fileDes[0], &buf, 1);
+	printf("%c", buf);
+	return 0;
+}
diff --git a/Year 3/System programming/Practicum6/ex2.c b/Year 3/System programming/Practicum6/ex2.c
new file mode 100644
index 0000000..c64ac9e
--- /dev/null
+++ b/Year 3/System programming/Practicum6/ex2.c
@@ -0,0 +1,17 @@
+#include <unistd.h>
+#include <stdio.h>
+
+int main() {
+	int fileDes[2];
+	if (pipe(fileDes) < 0) {
+		perror("pipe");
+		return 1;
+	}
+	if (close(fileDes[0]) < 0) {
+		perror("close");
+		return 2;
+	}
+	char buf = 'a';
+	write(fileDes[1], &buf, 1);
+	return 0;
+}
diff --git a/Year 3/System programming/Practicum6/ex3.c b/Year 3/System programming/Practicum6/ex3.c
new file mode 100644
index 0000000..a84d2cb
--- /dev/null
+++ b/Year 3/System programming/Practicum6/ex3.c
@@ -0,0 +1,16 @@
+#include <unistd.h>
+#include <stdio.h>
+
+int main() {
+	int fileDes[2];
+	if (pipe(fileDes) < 0) {
+		perror("pipe");
+		return 1;
+	}
+	char buf = 'a';
+	write(fileDes[1], &buf, 1);
+	char obuf;
+	read(fileDes[0], &obuf, 1);
+	printf("%c", obuf);
+	return 0;
+}
diff --git a/Year 3/System programming/Practicum6/ex4.c b/Year 3/System programming/Practicum6/ex4.c
new file mode 100644
index 0000000..fe0718e
--- /dev/null
+++ b/Year 3/System programming/Practicum6/ex4.c
@@ -0,0 +1,45 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main(int argc, char* argv[]) {
+	int fileDes[2];
+	if (pipe(fileDes) < 0) {
+		perror("pipe");
+		return 1;
+	}
+
+	int f = fork();
+	if (f == 0) { // child
+		if (close(fileDes[1]) < 0) {
+			perror("close");
+			return 2;
+		}
+
+		char buf[1024];
+		int count = argc - 1;
+		while (count > 0) {
+			read(fileDes[0], &buf, 1024);
+			if (buf[0] != '\0') {
+				printf("%s", buf);
+				count--;
+			}
+		}
+	}
+	else {
+		if (close(fileDes[0]) < 0) {
+			perror("close");
+			return 3;
+		}
+
+		for (size_t i = 1; i < argc; i++) {
+			write(fileDes[1], argv[i], strlen(argv[i]));
+			sleep(1);
+		}
+		int status;
+		wait(&status);
+	}
+	return 0;
+}
diff --git a/Year 3/System programming/Practicum6/ex5.c b/Year 3/System programming/Practicum6/ex5.c
new file mode 100644
index 0000000..903732d
--- /dev/null
+++ b/Year 3/System programming/Practicum6/ex5.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int main(int argc, char* argv[]) {
+	int pf[2];
+	pipe(pf);
+	int f = fork();
+	if (f == 0) { // child
+		if (close(pf[0]) < 0) {
+			perror("close");
+			return 1;
+		}
+		dup2(pf[1], 1);
+		if (close(pf[1]) < 0) {
+			perror("close");
+			return 2;
+		}
+
+		execlp(argv[1], argv[1], (char*)NULL);
+	}
+	else {
+		if (close(pf[1]) < 0) {
+			perror("close");
+			return 3;
+		}
+		dup2(pf[0], 0);
+		if (close(pf[0]) < 0) {
+			perror("close");
+			return 4;
+		}
+
+		int status;
+		wait(&status);
+
+		execlp(argv[2], argv[2], (char*)NULL);
+	}
+	return 0;
+}