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///////////////////////////////////////////////////////////////////////////////
//
/// \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
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