From 5df79c53745fde5d6c3340a2979b1429cd5892c1 Mon Sep 17 00:00:00 2001
From: Henrik Rydberg <rydberg@euromail.se>
Date: Sat, 8 Oct 2011 20:30:28 +0200
Subject: Initial import of htcd system 1.0

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
---
 src/mt/lock.cc | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 src/mt/lock.cc

(limited to 'src/mt/lock.cc')

diff --git a/src/mt/lock.cc b/src/mt/lock.cc
new file mode 100644
index 0000000..5b72967
--- /dev/null
+++ b/src/mt/lock.cc
@@ -0,0 +1,114 @@
+/*************************************************************************
+ *
+ * HTCd - Copyright (C) 1998-2006 Henrik Rydberg
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <mt/lock.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/utsname.h>
+#include <signal.h>
+using namespace std;
+
+const mstring LOCK=".lock";
+
+void LockFile(const mstring& path,int prot) throw(merror_t)
+{
+  mstring name=path+LOCK; int fd;
+  while((fd=open(name.c_str(),O_CREAT|O_WRONLY|O_TRUNC|O_EXCL,prot))==-1&&
+        errno==EEXIST) sleep(1);
+  if(fd<0) THROW("lock: could not create lock file "<<name);
+  close(fd);
+}
+
+int remove(const char* path);
+void UnlockFile(const mstring& path)
+{
+  remove((path+LOCK).c_str());
+}
+
+///////////////////////////////////////////////////////////////////
+
+proclock_t::proclock_t(const mstring& p,int prot) : pid(0),path(p+LOCK)
+{
+  mstring buf,name=path;
+  int fd=open(path.c_str(),O_CREAT|O_WRONLY|O_TRUNC|O_EXCL,prot);
+  if(fd<0) {
+    if(errno==EEXIST) {
+      buf.load(path);
+      int oldpid=atoi(buf);
+      if(kill(oldpid,0)==0) THROW("proclock: already running as "<<buf)
+      else fd=open(path.c_str(),O_CREAT|O_WRONLY|O_TRUNC,prot);
+    }
+    else THROW("proclock: could not create lock file "<<path);
+  }
+  pid=getpid();
+  buf.convert("%d",pid);
+  write(fd,buf.data(),buf.size());
+  close(fd);
+}
+
+proclock_t::~proclock_t()
+{
+  if(getpid()==pid) remove(path.c_str());
+}
+
+///////////////////////////////////////////////////////////////////
+
+nodelock_t::nodelock_t(const mstring& p,int prot) : pid(0),path(p+LOCK)
+{
+  struct utsname uts; uname(&uts);
+  mstring buf;
+  int fd=open(path.c_str(),O_CREAT|O_WRONLY|O_TRUNC|O_EXCL,prot);
+  if(fd<0) {
+    if(errno==EEXIST) {
+      if(buf.load(path)>=0) {
+        if(buf.nempty()&&buf!=sref(uts.nodename))
+          THROW("nodelock: already locked on "<<buf);
+      }
+      else {
+        fd=open(path.c_str(),O_CREAT|O_WRONLY|O_TRUNC,prot);
+        pid=getpid();
+        buf=uts.nodename;
+        write(fd,buf.data(),buf.size());
+        close(fd);
+      }
+    }
+    else THROW("nodelock: could not create lock file "<<path);
+  }
+  else {
+    pid=getpid();
+    buf=uts.nodename;
+    write(fd,buf.data(),buf.size());
+    close(fd);
+  }
+}
+
+nodelock_t::~nodelock_t()
+{
+  if(getpid()==pid) remove(path.c_str());
+}
+
+///////////////////////////////////////////////////////////////////
+
+void ProcTerminate(const mstring& p,int stime)
+{
+  mstring buf,path=p+LOCK;
+  if(buf.load(path)>=0) while(!kill(atoi(buf),SIGTERM)) sleep(stime);
+}
+
-- 
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