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gdb_wait.h
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1 /* Standard wait macros.
2 Copyright (C) 2000-2018 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19 #ifndef GDB_WAIT_H
20 #define GDB_WAIT_H
21
22 #ifdef HAVE_SYS_WAIT_H
23 #include <sys/wait.h> /* POSIX */
24 #else
25 #ifdef HAVE_WAIT_H
26 #include <wait.h> /* legacy */
27 #endif
28 #endif
29
30 /* Define how to access the int that the wait system call stores.
31 This has been compatible in all Unix systems since time immemorial,
32 but various well-meaning people have defined various different
33 words for the same old bits in the same old int (sometimes claimed
34 to be a struct). We just know it's an int and we use these macros
35 to access the bits. */
36
37 /* The following macros are defined equivalently to their definitions
38 in POSIX.1. We fail to define WNOHANG and WUNTRACED, which POSIX.1
39 <sys/wait.h> defines, since our code does not use waitpid() (but
40 NOTE exception for GNU/Linux below). We also fail to declare
41 wait() and waitpid(). */
42
43 #ifndef WIFEXITED
44 #define WIFEXITED(w) (((w)&0377) == 0)
45 #endif
46
47 #ifndef WIFSIGNALED
48 #define WIFSIGNALED(w) (((w)&0377) != 0177 && ((w)&~0377) == 0)
49 #endif
50
51 #ifndef WIFSTOPPED
52 #ifdef IBM6000
53
54 /* Unfortunately, the above comment (about being compatible in all Unix
55 systems) is not quite correct for AIX, sigh. And AIX 3.2 can generate
56 status words like 0x57c (sigtrap received after load), and gdb would
57 choke on it. */
58
59 #define WIFSTOPPED(w) ((w)&0x40)
60
61 #else
62 #define WIFSTOPPED(w) (((w)&0377) == 0177)
63 #endif
64 #endif
65
66 #ifndef WEXITSTATUS
67 #define WEXITSTATUS(w) (((w) >> 8) & 0377) /* same as WRETCODE */
68 #endif
69
70 #ifndef WTERMSIG
71 #define WTERMSIG(w) ((w) & 0177)
72 #endif
73
74 #ifndef WSTOPSIG
75 #define WSTOPSIG WEXITSTATUS
76 #endif
77
78 /* These are not defined in POSIX, but are used by our programs. */
79
80 #ifndef WSETEXIT
81 # ifdef W_EXITCODE
82 #define WSETEXIT(w,status) ((w) = W_EXITCODE(status,0))
83 # else
84 #define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
85 # endif
86 #endif
87
88 #ifndef W_STOPCODE
89 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
90 #endif
91
92 #ifndef WSETSTOP
93 #define WSETSTOP(w,sig) ((w) = W_STOPCODE(sig))
94 #endif
95
96 /* For native GNU/Linux we may use waitpid and the __WCLONE option.
97 <GRIPE> It is of course dangerous not to use the REAL header file...
98 </GRIPE>. */
99
100 /* Bits in the third argument to `waitpid'. */
101 #ifndef WNOHANG
102 #define WNOHANG 1 /* Don't block waiting. */
103 #endif
104
105 #ifndef WUNTRACED
106 #define WUNTRACED 2 /* Report status of stopped children. */
107 #endif
108
109 #ifndef __WCLONE
110 #define __WCLONE 0x80000000 /* Wait for cloned process. */
111 #endif
112
113 #endif