From 65966ded0cc15c5966c6568cf0ff2f2bbe1fc29a Mon Sep 17 00:00:00 2001
From: Stefan Zabka <zabkaste@hu-berlin.de>
Date: Sun, 24 May 2020 12:09:46 +0200
Subject: Big remodelling

---
 02_exercise/beispiele/pipe_bidirect/Makefile   |  19 ----
 02_exercise/beispiele/pipe_bidirect/log.txt    |  19 ----
 02_exercise/beispiele/pipe_bidirect/pingpong.c | 125 -------------------------
 3 files changed, 163 deletions(-)
 delete mode 100644 02_exercise/beispiele/pipe_bidirect/Makefile
 delete mode 100644 02_exercise/beispiele/pipe_bidirect/log.txt
 delete mode 100644 02_exercise/beispiele/pipe_bidirect/pingpong.c

(limited to '02_exercise/beispiele/pipe_bidirect')

diff --git a/02_exercise/beispiele/pipe_bidirect/Makefile b/02_exercise/beispiele/pipe_bidirect/Makefile
deleted file mode 100644
index 361ac97..0000000
--- a/02_exercise/beispiele/pipe_bidirect/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/usr/bin/make
-.SUFFIXES:
-
-CFLAGS = -c -Os -Wall -Werror
-
-%.o: %.c
-	$(CC) $(CFLAGS) $^ -o $@
-
-%: %.o
-	$(CC) -o $@ $^
-
-all: pingpong
-
-run: all
-	@echo "writing into log.txt; stop execution with CTRL+C"
-	./pingpong
-
-clean:
-	$(RM) $(RMFILES) pingpong
diff --git a/02_exercise/beispiele/pipe_bidirect/log.txt b/02_exercise/beispiele/pipe_bidirect/log.txt
deleted file mode 100644
index c59b0bb..0000000
--- a/02_exercise/beispiele/pipe_bidirect/log.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-[3225581]: ping
-[3225580]: pong
-[3225581]: ping
-[3225580]: pong
-[3225581]: ping
-[3225580]: pong
-[3225581]: ping
-[3225580]: pong
-[3225581]: ping
-[3225580]: pong
-[3225581]: ping
-[3225580]: pong
-[3225581]: ping
-[3225580]: pong
-[3225581]: ping
-[3225580]: pong
-[3225581]: ping
-[3225580]: pong
-Programmabbruch durch Nutzer
diff --git a/02_exercise/beispiele/pipe_bidirect/pingpong.c b/02_exercise/beispiele/pipe_bidirect/pingpong.c
deleted file mode 100644
index f38394f..0000000
--- a/02_exercise/beispiele/pipe_bidirect/pingpong.c
+++ /dev/null
@@ -1,125 +0,0 @@
-#include <fcntl.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-static int split(int fd[2]);
-static int redir(int fd, const char *file);
-static void sig_handler(int sig);
-
-static int parent;
-
-int main(void) {
-    ssize_t bytes;
-    char buf[256];
-    int fd[2];
-
-    // disable buffering for stdout
-    setvbuf(stdout, NULL, _IONBF, 0);
-
-    // redirect stdout to write into a file
-    if (redir(1, "log.txt") < 0) {
-        perror("redir()");
-        exit(-1);
-    }
-
-    // install the signal handler for Ctrl+C
-    if (signal(SIGINT, sig_handler) == SIG_ERR) {
-        perror("signal()");
-        exit(-1);
-    }
-
-    // split processes and assign file descriptors for communication
-    switch (split(fd)) {
-    case -1: // error
-        exit(-1);
-
-    case 0: // child
-        while ((bytes = read(fd[0], buf, sizeof(buf))) > 0) {
-            printf("[%u]: %s\n", getpid(), buf);
-            sleep(1);
-            write(fd[1], "pong", 5);
-        }
-        break;
-
-    case 1: // parent
-        parent = 1;
-        write(fd[1], "ping", 5);
-        while ((bytes = read(fd[0], buf, sizeof(buf))) > 0) {
-            printf("[%u]: %s\n", getpid(), buf);
-            sleep(1);
-            write(fd[1], "ping", 5);
-        }
-        break;
-    }
-
-    // close the file descriptors
-    close(fd[0]);
-    close(fd[1]);
-
-    return 0;
-}
-
-int split(int fd[2]) {
-    int pfd[2][2];
-
-    if (pipe(pfd[0]) < 0) {
-        perror("pipe()");
-        goto err_pipe1;
-    }
-
-    if (pipe(pfd[1]) < 0) {
-        perror("pipe()");
-        goto err_pipe2;
-    }
-
-    switch (fork()) {
-    case -1:
-        perror("fork()");
-        goto err_fork;
-
-    case 0:                // child process
-        close(pfd[0][1]);  // close write for child
-        close(pfd[1][0]);  // close read for parent
-        fd[0] = pfd[0][0]; // keep read for child
-        fd[1] = pfd[1][1]; // keep write for parent
-        return 0;
-
-    default:               // parent process
-        close(pfd[1][1]);  // close write for parent
-        close(pfd[0][0]);  // close read for child
-        fd[0] = pfd[1][0]; // keep read for parent
-        fd[1] = pfd[0][1]; // keep write for child
-        return 1;
-    }
-
-err_fork:
-    close(pfd[1][0]);
-    close(pfd[1][1]);
-err_pipe2:
-    close(pfd[0][0]);
-    close(pfd[0][1]);
-err_pipe1:
-    return -1;
-}
-
-int redir(int fd, const char *file) {
-    int fd2 = open(file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-
-    if (fd2 < 0)
-        return -1;
-
-    dup2(fd2, fd);
-    close(fd2);
-
-    return 0;
-}
-
-void sig_handler(int sig) {
-    if (parent) {
-        const char msg[] = "Programmabbruch durch Nutzer\n";
-        write(1, msg, sizeof(msg) - 1);
-    }
-    exit(0);
-}
-- 
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