[SP/P02] Solved exercises from second practice

4 files changed, 111 insertions, 0 deletions

diff --git a/Year 3/System programming/Practice02/ex1-1.c b/Year 3/System programming/Practice02/ex1-1.c
new file mode 100644
index 0000000..55f4ccf
--- /dev/null
+++ b/Year 3/System programming/Practice02/ex1-1.c
@@ -0,0 +1,25 @@
+#include <fcntl.h> // open, close, O_RDONLY
+#include <unistd.h> // read
+#include <stdio.h> // printf, perror
+
+int main(int argc, char* argv[]) {
+	int f1 = open(argv[1], O_RDONLY);
+	if (f1 < 0) {
+		perror("open");
+		return 1;
+	}
+
+	int f2 = open(argv[1], O_RDONLY);
+	if (f2 < 0) {
+		perror("open");
+		return 2;
+	}
+
+	char buf1, buf2;
+	while (read(f1, &buf1, 1) && read(f2, &buf2, 1)) {
+		printf("%c%c", buf1, buf2);
+	}
+
+	close(f1);
+	close(f2);
+}
diff --git a/Year 3/System programming/Practice02/ex1-2.c b/Year 3/System programming/Practice02/ex1-2.c
new file mode 100644
index 0000000..ef98a27
--- /dev/null
+++ b/Year 3/System programming/Practice02/ex1-2.c
@@ -0,0 +1,32 @@
+#include <fcntl.h> // open, close, O_RDONLY
+#include <unistd.h> // read
+#include <stdio.h> // printf, perror
+
+int main(int argc, char* argv[]) {
+	int f1 = open(argv[1], O_RDONLY);
+	if (f1 < 0) {
+		perror("open");
+		return 1;
+	}
+
+	int f2 = dup(f1);
+	if (f2 < 0) {
+		perror("dup");
+		return 2;
+	}
+
+	int readTimes = 10; // няколко пъти
+	char buf1, buf2;
+	while (readTimes > 0 && read(f1, &buf1, 1) && read(f2, &buf2, 1)) {
+		printf("%c%c", buf1, buf2);
+		readTimes--;
+	}
+
+	close(f1);
+
+	while (read(f2, &buf2, 1)) {
+		printf("%c", buf2);
+	}
+
+	close(f2);
+}
diff --git a/Year 3/System programming/Practice02/ex2.c b/Year 3/System programming/Practice02/ex2.c
new file mode 100644
index 0000000..6a8c420
--- /dev/null
+++ b/Year 3/System programming/Practice02/ex2.c
@@ -0,0 +1,24 @@
+#include <fcntl.h> // open, close, O_WRONLY, ...
+#include <unistd.h> // dup
+#include <stdio.h> // printf
+
+int main(int argc, char* argv[]) {
+	int f1 = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0755);
+	if (f1 < 0) {
+		perror("open");
+		return 1;
+	}
+
+	close(1);
+
+	int f2 = dup(f1);
+	if (f2 < 0) {
+		perror("dup");
+		return 2;
+	}
+
+	printf("Hello World!\n");
+
+	close(f1);
+	close(f2);
+}
diff --git a/Year 3/System programming/Practice02/ex3-stat.c b/Year 3/System programming/Practice02/ex3-stat.c
new file mode 100644
index 0000000..24a7777
--- /dev/null
+++ b/Year 3/System programming/Practice02/ex3-stat.c
@@ -0,0 +1,30 @@
+#include <sys/stat.h> // stat, struct stat, S_ISREG, ...
+#include <stdio.h> // printf, perror
+
+int main(int argc, char* argv[]) {
+	for (int i = 1; i < argc; i++) {
+		struct stat buf;
+		if (stat(argv[i], &buf) < 0) {
+			perror("stat");
+			return 1;
+		}
+
+		printf("  File: %s\n", argv[i]);
+		printf("  Size: %ld\tBlocks: %ld\tIO Block: %ld\t", buf.st_size, buf.st_blocks, buf.st_blksize);
+
+		     if (S_ISREG(buf.st_mode)) printf("regular file");
+		else if (S_ISDIR(buf.st_mode)) printf("directory");
+		else if (S_ISCHR(buf.st_mode)) printf("character special file");
+		else if (S_ISBLK(buf.st_mode)) printf("block special file");
+		else if (S_ISFIFO(buf.st_mode)) printf("fifo");
+		else if (S_ISLNK(buf.st_mode)) printf("symbolic link");
+		else if (S_ISSOCK(buf.st_mode)) printf("socket");
+		printf("\n");
+
+		printf("Device: %ld\tInode: %ld\tLinks: %ld\n", buf.st_dev, buf.st_ino, buf.st_nlink);
+		printf("Access: %u\tUid: %u\tGid: %u\n", buf.st_mode, buf.st_uid, buf.st_gid);
+		printf("Access: %ld\n", buf.st_atime);
+		printf("Modify: %ld\n", buf.st_mtime);
+		printf("Change: %ld\n", buf.st_ctime);
+	}
+}