1 /*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 2002-2004 Roland McGrath <roland@redhat.com>
7 * Copyright (c) 2004 Ulrich Drepper <drepper@redhat.com>
8 * Copyright (c) 2009-2013 Denys Vlasenko <dvlasenk@redhat.com>
9 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
10 * Copyright (c) 2014-2018 The strace developers.
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include "defs.h"
37 #include "ptrace.h"
38
39 #include <sys/wait.h>
40
41 #include "xlat/wait4_options.h"
42
43 #if !defined WCOREFLAG && defined WCOREFLG
44 # define WCOREFLAG WCOREFLG
45 #endif
46 #ifndef WCOREFLAG
47 # define WCOREFLAG 0x80
48 #endif
49 #ifndef WCOREDUMP
50 # define WCOREDUMP(status) ((status) & 0200)
51 #endif
52 #ifndef W_STOPCODE
53 # define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
54 #endif
55 #ifndef W_EXITCODE
56 # define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
57 #endif
58 #ifndef W_CONTINUED
59 # define W_CONTINUED 0xffff
60 #endif
61
62 #include "xlat/ptrace_events.h"
63
64 static int
printstatus(int status)65 printstatus(int status)
66 {
67 int exited = 0;
68
69 /*
70 * Here is a tricky presentation problem. This solution
71 * is still not entirely satisfactory but since there
72 * are no wait status constructors it will have to do.
73 */
74 if (WIFSTOPPED(status)) {
75 int sig = WSTOPSIG(status);
76 tprintf("[{WIFSTOPPED(s) && WSTOPSIG(s) == %s%s}",
77 signame(sig & 0x7f),
78 sig & 0x80 ? " | 0x80" : "");
79 status &= ~W_STOPCODE(sig);
80 } else if (WIFSIGNALED(status)) {
81 tprintf("[{WIFSIGNALED(s) && WTERMSIG(s) == %s%s}",
82 signame(WTERMSIG(status)),
83 WCOREDUMP(status) ? " && WCOREDUMP(s)" : "");
84 status &= ~(W_EXITCODE(0, WTERMSIG(status)) | WCOREFLAG);
85 } else if (WIFEXITED(status)) {
86 tprintf("[{WIFEXITED(s) && WEXITSTATUS(s) == %d}",
87 WEXITSTATUS(status));
88 exited = 1;
89 status &= ~W_EXITCODE(WEXITSTATUS(status), 0);
90 }
91 #ifdef WIFCONTINUED
92 else if (WIFCONTINUED(status)) {
93 tprints("[{WIFCONTINUED(s)}");
94 status &= ~W_CONTINUED;
95 }
96 #endif
97 else {
98 tprintf("[%#x]", status);
99 return 0;
100 }
101
102 if (status) {
103 unsigned int event = (unsigned int) status >> 16;
104 if (event) {
105 tprints(" | ");
106 printxval(ptrace_events, event, "PTRACE_EVENT_???");
107 tprints(" << 16");
108 status &= 0xffff;
109 }
110 if (status)
111 tprintf(" | %#x", status);
112 }
113 tprints("]");
114
115 return exited;
116 }
117
118 static int
printwaitn(struct tcb * const tcp,void (* const print_rusage)(struct tcb *,kernel_ulong_t))119 printwaitn(struct tcb *const tcp,
120 void (*const print_rusage)(struct tcb *, kernel_ulong_t))
121 {
122 if (entering(tcp)) {
123 /* On Linux, kernel-side pid_t is typedef'ed to int
124 * on all arches. Also, glibc-2.8 truncates wait3 and wait4
125 * pid argument to int on 64bit arches, producing,
126 * for example, wait4(4294967295, ...) instead of -1
127 * in strace. We have to use int here, not long.
128 */
129 int pid = tcp->u_arg[0];
130 tprintf("%d, ", pid);
131 } else {
132 int status;
133
134 /* status */
135 if (tcp->u_rval == 0)
136 printaddr(tcp->u_arg[1]);
137 else if (!umove_or_printaddr(tcp, tcp->u_arg[1], &status))
138 printstatus(status);
139 /* options */
140 tprints(", ");
141 printflags(wait4_options, tcp->u_arg[2], "W???");
142 if (print_rusage) {
143 /* usage */
144 tprints(", ");
145 if (tcp->u_rval > 0)
146 print_rusage(tcp, tcp->u_arg[3]);
147 else
148 printaddr(tcp->u_arg[3]);
149 }
150 }
151 return 0;
152 }
153
SYS_FUNC(waitpid)154 SYS_FUNC(waitpid)
155 {
156 return printwaitn(tcp, NULL);
157 }
158
SYS_FUNC(wait4)159 SYS_FUNC(wait4)
160 {
161 return printwaitn(tcp, printrusage);
162 }
163
164 #ifdef ALPHA
SYS_FUNC(osf_wait4)165 SYS_FUNC(osf_wait4)
166 {
167 return printwaitn(tcp, printrusage32);
168 }
169 #endif
170
171 #include "xlat/waitid_types.h"
172
SYS_FUNC(waitid)173 SYS_FUNC(waitid)
174 {
175 if (entering(tcp)) {
176 printxval(waitid_types, tcp->u_arg[0], "P_???");
177 int pid = tcp->u_arg[1];
178 tprintf(", %d, ", pid);
179 } else {
180 /* siginfo */
181 printsiginfo_at(tcp, tcp->u_arg[2]);
182 /* options */
183 tprints(", ");
184 printflags(wait4_options, tcp->u_arg[3], "W???");
185 /* usage */
186 tprints(", ");
187 printrusage(tcp, tcp->u_arg[4]);
188 }
189 return 0;
190 }
191