1 files changed, 26 insertions, 0 deletions
diff --git a/semestr-5/so/lista0/lista_0/3_cat.c b/semestr-5/so/lista0/lista_0/3_cat.c
new file mode 100644
index 0000000..45f4106
--- /dev/null
+++ b/semestr-5/so/lista0/lista_0/3_cat.c
@@ -0,0 +1,26 @@
+#include "apue.h"
+#include <stdio.h>
+#include <fcntl.h>
+
+#define BUFFSIZE 4096
+
+int main(int argc, char **argv) {
+  int n;
+  char buf[BUFFSIZE];
+
+  if (argc != 2) {
+    printf("Usage: %s <file to output>", argv[0]);
+    exit(1);
+  }
+
+  int fd = open(argv[1], O_RDONLY);
+
+  while ((n = read(fd, buf, BUFFSIZE)) > 0)
+    if (write(STDOUT_FILENO, buf, n) != n)
+      err_sys("write error");
+
+  if (n < 0)
+    err_sys("read error");
+
+  exit(0);
+}