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/*************************************************************************
*
* 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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