signals.h revision 207753 
1///////////////////////////////////////////////////////////////////////////////
2//
3/// \file       signals.h
4/// \brief      Handling signals to abort operation
5//
6//  Author:     Lasse Collin
7//
8//  This file has been put into the public domain.
9//  You can do whatever you want with this file.
10//
11///////////////////////////////////////////////////////////////////////////////
12
13/// If this is true, we will clean up the possibly incomplete output file,
14/// return to main() as soon as practical. That is, the code needs to poll
15/// this variable in various places.
16extern volatile sig_atomic_t user_abort;
17
18
19/// Initialize the signal handler, which will set user_abort to true when
20/// user e.g. presses C-c.
21extern void signals_init(void);
22
23
24#if defined(_WIN32) || defined(__VMS)
25#	define signals_block() do { } while (0)
26#	define signals_unblock() do { } while (0)
27#else
28/// Block the signals which don't have SA_RESTART and which would just set
29/// user_abort to true. This is handy when we don't want to handle EINTR
30/// and don't want SA_RESTART either.
31extern void signals_block(void);
32
33/// Unblock the signals blocked by signals_block().
34extern void signals_unblock(void);
35#endif
36
37#ifdef _WIN32
38#	define signals_exit() do { } while (0)
39#else
40/// If user has sent us a signal earlier to terminate the process,
41/// re-raise that signal to actually terminate the process.
42extern void signals_exit(void);
43#endif
44