Terminal

modules/Terminal/src/Terminal.cpp

@@ -0,0 +1,165 @@
+#define _XOPEN_SOURCE 600
+#include <stdlib.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+//#include <stdio.h>
+#define __USE_BSD
+#include <termios.h>
+#include <sys/select.h>
+#include <sys/ioctl.h>
+#include <string.h>
+
+#include "Terminal.h"
+#include "modules/ImguiModule/src/ImguiModule.h"
+
+
+Terminal::Terminal(Archimedes::App* a, void* h) : Archimedes::Module(a, h) {
+
+    name = "Terminal";
+
+    ImguiModule* im = new ImguiModule(a, nullptr);
+    deps[im->getName()] = im;
+}
+
+Terminal::~Terminal() {
+
+}
+
+void Terminal::onLoad() {
+    
+    ImguiModule* im = (ImguiModule*) moduleInstances["ImguiModule"];
+
+    if(!im) {
+        std::cout << "No ImguiModule for Terminal!\n";
+        std::abort();
+    }
+
+    ImGui::SetCurrentContext(im->getContext());
+
+    master = posix_openpt(O_RDWR);
+    if (master < 0) {
+        std::cerr << "Error " << errno << " on posix_openpt()\n";
+        std::abort();
+    }
+
+    int returnCode = grantpt(master);
+    if (!returnCode) {
+        std::cerr << "Error " << errno << " on grantpt()\n";
+        std::abort();
+    }
+
+    returnCode = unlockpt(master);
+    if (!returnCode) {
+        std::cerr << "Error " << errno << " on unlockpt()\n";
+        std::abort();
+    }
+
+    int slave = open(ptsname(master), O_RDWR);
+
+    /////////////////////////////////////////////////////
+    // Create the child process
+  if (fork())
+  {
+
+    // FATHER
+
+    // Close the slave side of the PTY
+    close(slave);
+
+    return;
+  } else
+  {
+  struct termios slave_orig_term_settings; // Saved terminal settings
+  struct termios new_term_settings; // Current terminal settings
+
+    // CHILD
+
+    // Close the master side of the PTY
+    close(master);
+
+    // Save the defaults parameters of the slave side of the PTY
+    returnCode = tcgetattr(slave, &slave_orig_term_settings);
+
+    // Set RAW mode on slave side of PTY
+    new_term_settings = slave_orig_term_settings;
+    cfmakeraw (&new_term_settings);
+    tcsetattr (slave, TCSANOW, &new_term_settings);
+
+    // The slave side of the PTY becomes the standard input and outputs of the child process
+    close(0); // Close standard input (current terminal)
+    close(1); // Close standard output (current terminal)
+    close(2); // Close standard error (current terminal)
+
+    dup(slave); // PTY becomes standard input (0)
+    dup(slave); // PTY becomes standard output (1)
+    dup(slave); // PTY becomes standard error (2)
+
+    // Now the original file descriptor is useless
+    close(slave);
+
+    // Make the current process a new session leader
+    setsid();
+
+    // As the child is a session leader, set the controlling terminal to be the slave side of the PTY
+    // (Mandatory for programs like the shell to make them manage correctly their outputs)
+    ioctl(0, TIOCSCTTY, 1);
+
+    // Execution of the program
+    {
+        char* const* args = nullptr;
+        returnCode = execvp("bash", args);
+    }
+
+    // if Error...
+    std::abort();
+  }
+
+    /////////////////////////////////////////////////////
+}
+
+void Terminal::run() {
+
+    static char input[150];
+    static char output[150];
+    static int returnCode;
+    static timeval timeout; timeout = { 0, 0 };
+    fd_set fd_in;
+    // Wait for data from standard input and master side of PTY
+    FD_ZERO(&fd_in);
+    FD_SET(master, &fd_in);
+
+    returnCode = select(master + 1, &fd_in, NULL, NULL, &timeout);
+    switch(returnCode) {
+        case -1: fprintf(stderr, "Error %d on select()\n", errno);
+                  exit(1);
+
+        default: {
+            // If data on master side of PTY
+            if (FD_ISSET(master, &fd_in)) {
+                returnCode = read(master, output, sizeof(output));
+                if (returnCode > 0) {
+                
+                } else {
+                    if (returnCode < 0) {
+                        fprintf(stderr, "Error %d on read master PTY\n", errno);
+                        exit(1);
+                    }
+                }
+            }
+        }
+    } // End switch
+
+
+    ImGui::Begin("Terminal Module");
+
+    ImGui::Text("%s", output);
+    ImGui::SameLine();
+    ImGui::InputText("", input, 150);
+    
+    if(ImGui::Button("send"))
+        write(master, input, returnCode);
+
+
+    ImGui::End();
+}