Signal.h

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/*---------------------------------------------------------------------\
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\---------------------------------------------------------------------*/
#ifndef ZYPP_BASE_SIGNAL_H
#define ZYPP_BASE_SIGNAL_H
 
#include <csignal>
#include <iosfwd>
 
namespace zypp
{ 
 
  class SignalSaver
  {
    public:
      SignalSaver( int signum_r, sighandler_t handler_r )
      : _signum( signum_r )
      { _orighandler = ::signal( signum_r, handler_r ); }
      ~SignalSaver()
      { ::signal( _signum, _orighandler ); }
    private:
      int _signum;
      ::sighandler_t _orighandler;
  };
 
  class SigprocmaskSaver
  {
    public:
      SigprocmaskSaver()
      { ::sigprocmask( SIG_SETMASK, NULL, &_origmask ); }
      ~SigprocmaskSaver()
      { ::sigprocmask( SIG_SETMASK, &_origmask, NULL ); }
    public:
      void block( int signum_r )
      {
        ::sigset_t mask;
        ::sigemptyset( & mask );
        ::sigaddset( & mask, signum_r );
        ::sigprocmask( SIG_BLOCK, &mask, NULL );
      }
      void unblock( int signum_r )
      {
        ::sigset_t mask;
        ::sigemptyset( & mask );
        ::sigaddset( & mask, signum_r );
        ::sigprocmask( SIG_UNBLOCK, &mask, NULL );
      }
      bool pending( int signum_r )
      {
        ::sigset_t mask;
        ::sigpending( &mask );
        return ::sigismember( &mask, signum_r );
      }
      void suspend()
      { ::sigsuspend( &_origmask ); }
    private:
      ::sigset_t _origmask;
  };
 
} // namespace zypp
#endif // ZYPP_BASE_SIGNAL_H