strace/wait.c

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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 2002-2004 Roland McGrath <roland@redhat.com>
* Copyright (c) 2004 Ulrich Drepper <drepper@redhat.com>
* Copyright (c) 2009-2013 Denys Vlasenko <dvlasenk@redhat.com>
* Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2014-2018 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "defs.h"
#include "ptrace.h"
#include <sys/wait.h>
#include "xlat/wait4_options.h"
#if !defined WCOREFLAG && defined WCOREFLG
# define WCOREFLAG WCOREFLG
#endif
#ifndef WCOREFLAG
# define WCOREFLAG 0x80
#endif
#ifndef WCOREDUMP
# define WCOREDUMP(status) ((status) & 0200)
#endif
#ifndef W_STOPCODE
# define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
#endif
#ifndef W_EXITCODE
# define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
#endif
#ifndef W_CONTINUED
# define W_CONTINUED 0xffff
#endif
#include "xlat/ptrace_events.h"
static int
printstatus(int status)
{
int exited = 0;
/*
* Here is a tricky presentation problem. This solution
* is still not entirely satisfactory but since there
* are no wait status constructors it will have to do.
*/
if (WIFSTOPPED(status)) {
int sig = WSTOPSIG(status);
tprintf("[{WIFSTOPPED(s) && WSTOPSIG(s) == %s%s}",
signame(sig & 0x7f),
sig & 0x80 ? " | 0x80" : "");
status &= ~W_STOPCODE(sig);
} else if (WIFSIGNALED(status)) {
tprintf("[{WIFSIGNALED(s) && WTERMSIG(s) == %s%s}",
signame(WTERMSIG(status)),
WCOREDUMP(status) ? " && WCOREDUMP(s)" : "");
status &= ~(W_EXITCODE(0, WTERMSIG(status)) | WCOREFLAG);
} else if (WIFEXITED(status)) {
tprintf("[{WIFEXITED(s) && WEXITSTATUS(s) == %d}",
WEXITSTATUS(status));
exited = 1;
status &= ~W_EXITCODE(WEXITSTATUS(status), 0);
}
#ifdef WIFCONTINUED
else if (WIFCONTINUED(status)) {
tprints("[{WIFCONTINUED(s)}");
status &= ~W_CONTINUED;
}
#endif
else {
tprintf("[%#x]", status);
return 0;
}
if (status) {
unsigned int event = (unsigned int) status >> 16;
if (event) {
tprints(" | ");
printxval(ptrace_events, event, "PTRACE_EVENT_???");
tprints(" << 16");
status &= 0xffff;
}
if (status)
tprintf(" | %#x", status);
}
tprints("]");
return exited;
}
static int
printwaitn(struct tcb *const tcp,
void (*const print_rusage)(struct tcb *, kernel_ulong_t))
{
if (entering(tcp)) {
/* On Linux, kernel-side pid_t is typedef'ed to int
* on all arches. Also, glibc-2.8 truncates wait3 and wait4
* pid argument to int on 64bit arches, producing,
* for example, wait4(4294967295, ...) instead of -1
* in strace. We have to use int here, not long.
*/
int pid = tcp->u_arg[0];
tprintf("%d, ", pid);
} else {
int status;
/* status */
if (tcp->u_rval == 0)
printaddr(tcp->u_arg[1]);
else if (!umove_or_printaddr(tcp, tcp->u_arg[1], &status))
printstatus(status);
/* options */
tprints(", ");
printflags(wait4_options, tcp->u_arg[2], "W???");
if (print_rusage) {
/* usage */
tprints(", ");
if (tcp->u_rval > 0)
print_rusage(tcp, tcp->u_arg[3]);
else
printaddr(tcp->u_arg[3]);
}
}
return 0;
}
SYS_FUNC(waitpid)
{
return printwaitn(tcp, NULL);
}
SYS_FUNC(wait4)
{
return printwaitn(tcp, printrusage);
}
#ifdef ALPHA
SYS_FUNC(osf_wait4)
{
return printwaitn(tcp, printrusage32);
}
#endif
#include "xlat/waitid_types.h"
SYS_FUNC(waitid)
{
if (entering(tcp)) {
printxval(waitid_types, tcp->u_arg[0], "P_???");
int pid = tcp->u_arg[1];
tprintf(", %d, ", pid);
} else {
/* siginfo */
printsiginfo_at(tcp, tcp->u_arg[2]);
/* options */
tprints(", ");
printflags(wait4_options, tcp->u_arg[3], "W???");
/* usage */
tprints(", ");
printrusage(tcp, tcp->u_arg[4]);
}
return 0;
}