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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@strace.io>
* Copyright (c) 2014-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include "ptrace.h"
#include "wait.h"
#include "xlat/wait4_options.h"
#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.
*/
tprint_indirect_begin();
if (WIFSTOPPED(status)) {
int sig = WSTOPSIG(status);
tprintf("{WIFSTOPPED(s) && WSTOPSIG(s) == %s%s}",
sprintsigname(sig & 0x7f),
sig & 0x80 ? " | 0x80" : "");
status &= ~W_STOPCODE(sig);
} else if (WIFSIGNALED(status)) {
tprintf("{WIFSIGNALED(s) && WTERMSIG(s) == %s%s}",
sprintsigname(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 {
PRINT_VAL_X(status);
tprint_indirect_end();
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) {
tprints(" | ");
PRINT_VAL_X(status);
}
}
tprint_indirect_end();
return exited;
}
static int
printwaitn(struct tcb *const tcp,
void (*const print_rusage)(struct tcb *, kernel_ulong_t))
{
if (entering(tcp)) {
/* pid */
printpid_tgid_pgid(tcp, tcp->u_arg[0]);
tprint_arg_next();
} 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);
tprint_arg_next();
/* options */
printflags(wait4_options, tcp->u_arg[2], "W???");
if (print_rusage) {
tprint_arg_next();
/* usage */
if (tcp->u_rval > 0)
print_rusage(tcp, tcp->u_arg[3]);
else
printaddr(tcp->u_arg[3]);
}
}
return RVAL_TGID;
}
SYS_FUNC(waitpid)
{
return printwaitn(tcp, NULL);
}
#if HAVE_ARCH_TIME32_SYSCALLS || HAVE_ARCH_OLD_TIME64_SYSCALLS
SYS_FUNC(wait4)
{
return printwaitn(tcp, printrusage);
}
#endif
#ifdef ALPHA
SYS_FUNC(osf_wait4)
{
return printwaitn(tcp, printrusage32);
}
#endif
#include "xlat/waitid_types.h"
SYS_FUNC(waitid)
{
unsigned int idtype = (unsigned int) tcp->u_arg[0];
int id = tcp->u_arg[1];
if (entering(tcp)) {
/* idtype */
printxval(waitid_types, idtype, "P_???");
tprint_arg_next();
switch (idtype) {
case P_PID:
printpid(tcp, id, PT_TGID);
break;
case P_PIDFD:
printfd(tcp, id);
break;
case P_PGID:
printpid(tcp, id, PT_PGID);
break;
default:
PRINT_VAL_D(id);
break;
}
tprint_arg_next();
} else {
/* siginfo */
printsiginfo_at(tcp, tcp->u_arg[2]);
tprint_arg_next();
/* options */
printflags(wait4_options, tcp->u_arg[3], "W???");
tprint_arg_next();
/* usage */
printrusage(tcp, tcp->u_arg[4]);
}
return 0;
}
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