1 files changed, 134 insertions, 0 deletions
diff --git a/src/Common/Backends/SystemBackendPosix.cpp b/src/Common/Backends/SystemBackendPosix.cpp
new file mode 100644
index 0000000..b1e088d
--- /dev/null
+++ b/src/Common/Backends/SystemBackendPosix.cpp
@@ -0,0 +1,134 @@
+/*
+ * SystemBackendPosix.cpp
+ *
+ * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "SystemBackendPosix.h"
+
+#include <cstdlib>
+#include <cstring>
+#include <signal.h>
+#include <spawn.h>
+#include <sys/wait.h>
+
+namespace Mad {
+namespace Common {
+namespace Backends {
+
+SystemBackendPosix SystemBackendPosix::backend;
+std::map<pid_t, sigc::slot<void, int> > SystemBackendPosix::processes;
+
+
+void SystemBackendPosix::setChildHandler() {
+  struct sigaction action;
+
+  action.sa_handler = childHandler;
+  sigemptyset(&action.sa_mask);
+  action.sa_flags = 0;
+
+  sigaction(SIGCHLD, &action, 0);
+}
+
+SystemBackendPosix::~SystemBackendPosix() {
+  struct sigaction action;
+
+  action.sa_handler = SIG_DFL;
+  sigemptyset(&action.sa_mask);
+  action.sa_flags = 0;
+
+  sigaction(SIGCHLD, &action, 0);
+}
+
+void SystemBackendPosix::childHandler(int) {
+  int status;
+  pid_t pid;
+
+  while((pid = waitpid(-1, &status, WNOHANG)) > 0) {
+    std::map<pid_t, sigc::slot<void, int> >::iterator it = processes.find(pid);
+
+    if(it != processes.end()) {
+      it->second(status);
+      processes.erase(it);
+    }
+  }
+
+  setChildHandler();
+}
+
+bool SystemBackendPosix::exec(sigc::slot<void, int> resultHandler, const std::string &filename, const std::vector<std::string> &argv, const std::vector<std::string> &env) {
+  pid_t pid;
+  char **argvp, **envp;
+
+  if(argv.empty()) {
+    argvp = new char*[2];
+
+    argvp[0] = strdup(filename.c_str());
+    argvp[1] = 0;
+  }
+  else {
+    argvp = new char*[argv.size() + 1];
+
+    for(size_t s = 0; s < argv.size(); ++s) {
+      argvp[s] = strdup(argv[s].c_str());
+    }
+
+    argvp[argv.size()] = 0;
+  }
+
+  if(env.empty()) {
+    envp = environ;
+  }
+  else {
+    envp = new char*[env.size() + 1];
+
+    for(size_t s = 0; s < env.size(); ++s) {
+      envp[0] = strdup(env[s].c_str());
+    }
+
+    envp[env.size()] = 0;
+  }
+
+  sigset_t set, oldset;
+  sigemptyset(&set);
+  sigaddset(&set, SIGCHLD);
+  sigprocmask(SIG_BLOCK, &set, &oldset);
+
+  bool ret = (posix_spawnp(&pid, filename.c_str(), 0, 0, argvp, envp) == 0);
+
+  if(ret)
+    processes.insert(std::make_pair(pid, resultHandler));
+
+  sigprocmask(SIG_SETMASK, &oldset, 0);
+
+  for(char **p = argvp; *p != 0; ++p)
+    std::free(*p);
+
+  delete [] argvp;
+
+  if(envp != environ) {
+    for(char **p = envp; *p != 0; ++p)
+      std::free(*p);
+
+    delete [] envp;
+  }
+
+  return ret;
+}
+
+}
+}
+}