1 /*
2  * Copyright (c) 2017 The strace developers.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. The name of the author may not be used to endorse or promote products
14  *    derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 
28 #ifndef STRACE_TRACE_EVENT_H
29 #define STRACE_TRACE_EVENT_H
30 
31 /* Possible trace event loop states. Returned by next_event() and dispatched by
32  * dispatch_event(). */
33 enum trace_event {
34 	/* Break the main loop. */
35 	TE_BREAK,
36 
37 	/* Call next_event() again. */
38 	TE_NEXT,
39 
40 	/* Restart the tracee with signal 0 and call next_event() again. */
41 	TE_RESTART,
42 
43 	/*
44 	 * For all the events below, current_tcp is set to current tracee's
45 	 * tcb.  All the suggested actions imply that you want to continue
46 	 * tracing of the current tracee; alternatively, you can detach it.
47 	 */
48 
49 	/*
50 	 * Syscall entry or exit.
51 	 * Restart the tracee with signal 0, or with an injected signal number.
52 	 */
53 	TE_SYSCALL_STOP,
54 
55 	/*
56 	 * Tracee received signal with number WSTOPSIG(*pstatus); signal info
57 	 * is written to *si.  Restart the tracee (with that signal number
58 	 * if you want to deliver it).
59 	 */
60 	TE_SIGNAL_DELIVERY_STOP,
61 
62 	/*
63 	 * Tracee was killed by a signal with number WTERMSIG(*pstatus).
64 	 */
65 	TE_SIGNALLED,
66 
67 	/*
68 	 * Tracee was stopped by a signal with number WSTOPSIG(*pstatus).
69 	 * Restart the tracee with that signal number.
70 	 */
71 	TE_GROUP_STOP,
72 
73 	/*
74 	 * Tracee exited with status WEXITSTATUS(*pstatus).
75 	 */
76 	TE_EXITED,
77 
78 	/*
79 	 * Tracee is going to perform execve().
80 	 * Restart the tracee with signal 0.
81 	 */
82 	TE_STOP_BEFORE_EXECVE,
83 
84 	/*
85 	 * Tracee is going to terminate.
86 	 * Restart the tracee with signal 0.
87 	 */
88 	TE_STOP_BEFORE_EXIT,
89 };
90 
91 #endif /* !STRACE_TRACE_EVENT_H */
92