xz-archive/src/xz/signals.h

///////////////////////////////////////////////////////////////////////////////
//
/// \file       signals.h
/// \brief      Handling signals to abort operation
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////

/// If this is true, we will clean up the possibly incomplete output file,
/// return to main() as soon as practical. That is, the code needs to poll
/// this variable in various places.
extern volatile sig_atomic_t user_abort;


/// Initialize the signal handler, which will set user_abort to true when
/// user e.g. presses C-c.
extern void signals_init(void);


#if (defined(_WIN32) && !defined(__CYGWIN__)) || defined(__VMS)
#	define signals_block() do { } while (0)
#	define signals_unblock() do { } while (0)
#else
/// Block the signals which don't have SA_RESTART and which would just set
/// user_abort to true. This is handy when we don't want to handle EINTR
/// and don't want SA_RESTART either.
extern void signals_block(void);

/// Unblock the signals blocked by signals_block().
extern void signals_unblock(void);
#endif

#if defined(_WIN32) && !defined(__CYGWIN__)
#	define signals_exit() do { } while (0)
#else
/// If user has sent us a signal earlier to terminate the process,
/// re-raise that signal to actually terminate the process.
extern void signals_exit(void);
#endif