--- /dev/null
+// $Id$ --*- c -*--
+
+// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.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; version 2 of the License.
+//
+// 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, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+/// \args p[0] used for parent -> child sync (child waits till parent is in deathrow)
+/// \args p[1] used for child -> parent sync (recognize execv() errors)
+static inline ALWAYSINLINE int
+initSync(int p[2][2], bool do_disconnect)
+{
+ if (!do_disconnect) return 0;
+
+ Epipe(p[0]);
+ Epipe(p[1]);
+ fcntl(p[1][1], F_SETFD, FD_CLOEXEC);
+ return Efork();
+}
+
+static inline ALWAYSINLINE void
+doSyncStage0(int p[2][2], bool do_disconnect)
+{
+ char c;
+ if (!do_disconnect) return;
+
+ Eclose(p[0][1]);
+ Eread (p[0][0], &c, 1);
+ Eclose(p[0][0]);
+}
+
+static inline ALWAYSINLINE void
+doSyncStage1(int p[2][2], bool do_disconnect)
+{
+ int fd;
+
+ if (!do_disconnect) return;
+
+ fd = Eopen("/dev/null", O_RDONLY|O_NONBLOCK, 0);
+ Esetsid();
+ Edup2(fd, 0);
+ Eclose(p[1][0]);
+ if (fd!=0) Eclose(fd);
+ Ewrite(p[1][1], ".", 1);
+}
+
+static inline ALWAYSINLINE void
+doSyncStage2(int p[2][2], bool do_disconnect)
+{
+ if (!do_disconnect) return;
+
+ Ewrite(p[1][1], "X", 1);
+}
+
+/// \args p[0] used for parent -> child sync (child waits till parent is in deathrow)
+/// \args p[1] used for child -> parent sync (recognize execv() errors)
+static void
+waitOnSync(pid_t pid, int p[2][2], bool is_prevent_race)
+{
+ char c;
+ size_t l;
+
+ if (is_prevent_race &&
+ !jailIntoTempDir(0)) {
+ perror(ENSC_WRAPPERS_PREFIX "jailIntoTempDir()");
+ exit(255);
+ }
+
+ Eclose(p[0][0]);
+ Ewrite(p[0][1], "X", 1);
+ Eclose(p[0][1]);
+
+ Eclose(p[1][1]);
+ l = Eread(p[1][0], &c, 1);
+ if (l!=1) exitLikeProcess(pid);
+ l = Eread(p[1][0], &c, 1);
+ if (l!=0) exitLikeProcess(pid);
+}