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 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote products
21 *    derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#include "defs.h"
36
37#include <sys/wait.h>
38
39#include "xlat/wait4_options.h"
40
41#if !defined WCOREFLAG && defined WCOREFLG
42# define WCOREFLAG WCOREFLG
43#endif
44#ifndef WCOREFLAG
45# define WCOREFLAG 0x80
46#endif
47#ifndef WCOREDUMP
48# define WCOREDUMP(status)  ((status) & 0200)
49#endif
50#ifndef W_STOPCODE
51# define W_STOPCODE(sig)  ((sig) << 8 | 0x7f)
52#endif
53#ifndef W_EXITCODE
54# define W_EXITCODE(ret, sig)  ((ret) << 8 | (sig))
55#endif
56#ifndef W_CONTINUED
57# define W_CONTINUED 0xffff
58#endif
59
60#include "ptrace.h"
61#include "xlat/ptrace_events.h"
62
63static int
64printstatus(int status)
65{
66	int exited = 0;
67
68	/*
69	 * Here is a tricky presentation problem.  This solution
70	 * is still not entirely satisfactory but since there
71	 * are no wait status constructors it will have to do.
72	 */
73	if (WIFSTOPPED(status)) {
74		int sig = WSTOPSIG(status);
75		tprintf("[{WIFSTOPPED(s) && WSTOPSIG(s) == %s%s}",
76			signame(sig & 0x7f),
77			sig & 0x80 ? " | 0x80" : "");
78		status &= ~W_STOPCODE(sig);
79	}
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	}
86	else if (WIFEXITED(status)) {
87		tprintf("[{WIFEXITED(s) && WEXITSTATUS(s) == %d}",
88			WEXITSTATUS(status));
89		exited = 1;
90		status &= ~W_EXITCODE(WEXITSTATUS(status), 0);
91	}
92#ifdef WIFCONTINUED
93	else if (WIFCONTINUED(status)) {
94		tprints("[{WIFCONTINUED(s)}");
95		status &= ~W_CONTINUED;
96	}
97#endif
98	else {
99		tprintf("[%#x]", status);
100		return 0;
101	}
102
103	if (status) {
104		unsigned int event = (unsigned int) status >> 16;
105		if (event) {
106			tprints(" | ");
107			printxval(ptrace_events, event, "PTRACE_EVENT_???");
108			tprints(" << 16");
109			status &= 0xffff;
110		}
111		if (status)
112			tprintf(" | %#x", status);
113	}
114	tprints("]");
115
116	return exited;
117}
118
119static int
120printwaitn(struct tcb *tcp, int n, int bitness)
121{
122	int status;
123
124	if (entering(tcp)) {
125		/* On Linux, kernel-side pid_t is typedef'ed to int
126		 * on all arches. Also, glibc-2.8 truncates wait3 and wait4
127		 * pid argument to int on 64bit arches, producing,
128		 * for example, wait4(4294967295, ...) instead of -1
129		 * in strace. We have to use int here, not long.
130		 */
131		int pid = tcp->u_arg[0];
132		tprintf("%d, ", pid);
133	} else {
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 (n == 4) {
143			tprints(", ");
144			/* usage */
145			if (tcp->u_rval > 0) {
146#ifdef ALPHA
147				if (bitness)
148					printrusage32(tcp, tcp->u_arg[3]);
149				else
150#endif
151					printrusage(tcp, tcp->u_arg[3]);
152			}
153			else
154				printaddr(tcp->u_arg[3]);
155		}
156	}
157	return 0;
158}
159
160SYS_FUNC(waitpid)
161{
162	return printwaitn(tcp, 3, 0);
163}
164
165SYS_FUNC(wait4)
166{
167	return printwaitn(tcp, 4, 0);
168}
169
170#ifdef ALPHA
171SYS_FUNC(osf_wait4)
172{
173	return printwaitn(tcp, 4, 1);
174}
175#endif
176
177#include "xlat/waitid_types.h"
178
179SYS_FUNC(waitid)
180{
181	if (entering(tcp)) {
182		printxval(waitid_types, tcp->u_arg[0], "P_???");
183		tprintf(", %ld, ", tcp->u_arg[1]);
184	} else {
185		/* siginfo */
186		printsiginfo_at(tcp, tcp->u_arg[2]);
187		/* options */
188		tprints(", ");
189		printflags(wait4_options, tcp->u_arg[3], "W???");
190		if (tcp->s_ent->nargs > 4) {
191			/* usage */
192			tprints(", ");
193			printrusage(tcp, tcp->u_arg[4]);
194		}
195	}
196	return 0;
197}
198