#include "pathlocks.hh"
#include "util.hh"

#include <cerrno>
#include <cstdlib>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>


namespace nix {


int openLockFile(const Path & path, bool create)
{
    AutoCloseFD fd;

    fd = open(path.c_str(), O_RDWR | (create ? O_CREAT : 0), 0600);
    if (fd == -1 && (create || errno != ENOENT))
        throw SysError(format("opening lock file `%1%'") % path);

    closeOnExec(fd);

    return fd.borrow();
}


void deleteLockFile(const Path & path, int fd)
{
    /* Get rid of the lock file.  Have to be careful not to introduce
       races.  Write a (meaningless) token to the file to indicate to
       other processes waiting on this lock that the lock is stale
       (deleted). */
    unlink(path.c_str());
    writeFull(fd, "d");
    /* Note that the result of unlink() is ignored; removing the lock
       file is an optimisation, not a necessity. */
}


bool lockFile(int fd, LockType lockType, bool wait)
{
    struct flock lock;
    if (lockType == ltRead) lock.l_type = F_RDLCK;
    else if (lockType == ltWrite) lock.l_type = F_WRLCK;
    else if (lockType == ltNone) lock.l_type = F_</td></tr></table>
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   if (close(i->first) == -1)
            printMsg(lvlError,
                format("error (ignored): cannot close lock file on `%1%'") % i->second);

        debug(format("lock released on `%1%'") % i->second);
    }

    fds.clear();
}


void PathLocks::setDeletion(bool deletePaths)
{
    this->deletePaths = deletePaths;
}


bool pathIsLockedByMe(const Path & path)
{
    Path lockPath = path + ".lock";
    return lockedPaths.find(lockPath) != lockedPaths.end();
}

 
}