Specifically, decode the siginfo structure returned by sigtimedwait(), sigwaitinfo(), and wait6(). While here, also decode the signal number returned in the second argument to sigwait().
747 lines
18 KiB
C
747 lines
18 KiB
C
/*-
|
|
* Copyright 1997 Sean Eric Fagan
|
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*
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* Redistribution and use in source and binary forms, with or without
|
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* modification, are permitted provided that the following conditions
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* are met:
|
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* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
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* This product includes software developed by Sean Eric Fagan
|
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* 4. Neither the name of the author may be used to endorse or promote
|
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* products derived from this software without specific prior written
|
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*/
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|
|
#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
|
|
|
|
/*
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* Various setup functions for truss. Not the cleanest-written code,
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* I'm afraid.
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*/
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|
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#include <sys/ptrace.h>
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#include <sys/sysctl.h>
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#include <sys/wait.h>
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|
|
|
#include <assert.h>
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|
#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdint.h>
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|
#include <stdio.h>
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|
#include <stdlib.h>
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|
#include <string.h>
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|
#include <sysdecode.h>
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#include <time.h>
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#include <unistd.h>
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|
|
|
#include "truss.h"
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#include "syscall.h"
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|
#include "extern.h"
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|
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|
SET_DECLARE(procabi, struct procabi);
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|
|
|
static sig_atomic_t detaching;
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|
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|
static void enter_syscall(struct trussinfo *, struct threadinfo *,
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struct ptrace_lwpinfo *);
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static void new_proc(struct trussinfo *, pid_t, lwpid_t);
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|
|
|
/*
|
|
* setup_and_wait() is called to start a process. All it really does
|
|
* is fork(), enable tracing in the child, and then exec the given
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|
* command. At that point, the child process stops, and the parent
|
|
* can wake up and deal with it.
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|
*/
|
|
void
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|
setup_and_wait(struct trussinfo *info, char *command[])
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|
{
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pid_t pid;
|
|
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|
pid = vfork();
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if (pid == -1)
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err(1, "fork failed");
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if (pid == 0) { /* Child */
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ptrace(PT_TRACE_ME, 0, 0, 0);
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execvp(command[0], command);
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err(1, "execvp %s", command[0]);
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}
|
|
|
|
/* Only in the parent here */
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|
if (waitpid(pid, NULL, 0) < 0)
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|
err(1, "unexpect stop in waitpid");
|
|
|
|
new_proc(info, pid, 0);
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|
}
|
|
|
|
/*
|
|
* start_tracing is called to attach to an existing process.
|
|
*/
|
|
void
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|
start_tracing(struct trussinfo *info, pid_t pid)
|
|
{
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|
int ret, retry;
|
|
|
|
retry = 10;
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do {
|
|
ret = ptrace(PT_ATTACH, pid, NULL, 0);
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|
usleep(200);
|
|
} while (ret && retry-- > 0);
|
|
if (ret)
|
|
err(1, "can not attach to target process");
|
|
|
|
if (waitpid(pid, NULL, 0) < 0)
|
|
err(1, "Unexpect stop in waitpid");
|
|
|
|
new_proc(info, pid, 0);
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|
}
|
|
|
|
/*
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|
* Restore a process back to it's pre-truss state.
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|
* Called for SIGINT, SIGTERM, SIGQUIT. This only
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* applies if truss was told to monitor an already-existing
|
|
* process.
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|
*/
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|
void
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|
restore_proc(int signo __unused)
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|
{
|
|
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|
detaching = 1;
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|
}
|
|
|
|
static void
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|
detach_proc(pid_t pid)
|
|
{
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|
|
|
/* stop the child so that we can detach */
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kill(pid, SIGSTOP);
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if (waitpid(pid, NULL, 0) < 0)
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err(1, "Unexpected stop in waitpid");
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|
|
|
if (ptrace(PT_DETACH, pid, (caddr_t)1, 0) < 0)
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err(1, "Can not detach the process");
|
|
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|
kill(pid, SIGCONT);
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}
|
|
|
|
/*
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|
* Determine the ABI. This is called after every exec, and when
|
|
* a process is first monitored.
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|
*/
|
|
static struct procabi *
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|
find_abi(pid_t pid)
|
|
{
|
|
struct procabi **pabi;
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|
size_t len;
|
|
int error;
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|
int mib[4];
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|
char progt[32];
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|
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|
len = sizeof(progt);
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_SV_NAME;
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mib[3] = pid;
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error = sysctl(mib, 4, progt, &len, NULL, 0);
|
|
if (error != 0)
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|
err(2, "can not get sysvec name");
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|
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|
SET_FOREACH(pabi, procabi) {
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if (strcmp((*pabi)->type, progt) == 0)
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return (*pabi);
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}
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warnx("ABI %s for pid %ld is not supported", progt, (long)pid);
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return (NULL);
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}
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static struct threadinfo *
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new_thread(struct procinfo *p, lwpid_t lwpid)
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|
{
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struct threadinfo *nt;
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|
/*
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|
* If this happens it means there is a bug in truss. Unfortunately
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* this will kill any processes truss is attached to.
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|
*/
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LIST_FOREACH(nt, &p->threadlist, entries) {
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if (nt->tid == lwpid)
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|
errx(1, "Duplicate thread for LWP %ld", (long)lwpid);
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|
}
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|
nt = calloc(1, sizeof(struct threadinfo));
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|
if (nt == NULL)
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|
err(1, "calloc() failed");
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nt->proc = p;
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nt->tid = lwpid;
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LIST_INSERT_HEAD(&p->threadlist, nt, entries);
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|
return (nt);
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|
}
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|
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|
static void
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|
free_thread(struct threadinfo *t)
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|
{
|
|
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|
LIST_REMOVE(t, entries);
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|
free(t);
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|
}
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|
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|
static void
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|
add_threads(struct trussinfo *info, struct procinfo *p)
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{
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|
struct ptrace_lwpinfo pl;
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|
struct threadinfo *t;
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|
lwpid_t *lwps;
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|
int i, nlwps;
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|
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|
nlwps = ptrace(PT_GETNUMLWPS, p->pid, NULL, 0);
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|
if (nlwps == -1)
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|
err(1, "Unable to fetch number of LWPs");
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|
assert(nlwps > 0);
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|
lwps = calloc(nlwps, sizeof(*lwps));
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nlwps = ptrace(PT_GETLWPLIST, p->pid, (caddr_t)lwps, nlwps);
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|
if (nlwps == -1)
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|
err(1, "Unable to fetch LWP list");
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for (i = 0; i < nlwps; i++) {
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t = new_thread(p, lwps[i]);
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if (ptrace(PT_LWPINFO, lwps[i], (caddr_t)&pl, sizeof(pl)) == -1)
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|
err(1, "ptrace(PT_LWPINFO)");
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|
if (pl.pl_flags & PL_FLAG_SCE) {
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info->curthread = t;
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|
enter_syscall(info, t, &pl);
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|
}
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|
}
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|
free(lwps);
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|
}
|
|
|
|
static void
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|
new_proc(struct trussinfo *info, pid_t pid, lwpid_t lwpid)
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|
{
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|
struct procinfo *np;
|
|
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|
/*
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|
* If this happens it means there is a bug in truss. Unfortunately
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|
* this will kill any processes truss is attached to.
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|
*/
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|
LIST_FOREACH(np, &info->proclist, entries) {
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|
if (np->pid == pid)
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|
errx(1, "Duplicate process for pid %ld", (long)pid);
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|
}
|
|
|
|
if (info->flags & FOLLOWFORKS)
|
|
if (ptrace(PT_FOLLOW_FORK, pid, NULL, 1) == -1)
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|
err(1, "Unable to follow forks for pid %ld", (long)pid);
|
|
if (ptrace(PT_LWP_EVENTS, pid, NULL, 1) == -1)
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|
err(1, "Unable to enable LWP events for pid %ld", (long)pid);
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|
np = calloc(1, sizeof(struct procinfo));
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|
np->pid = pid;
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|
np->abi = find_abi(pid);
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|
LIST_INIT(&np->threadlist);
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|
LIST_INSERT_HEAD(&info->proclist, np, entries);
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|
|
|
if (lwpid != 0)
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|
new_thread(np, lwpid);
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|
else
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|
add_threads(info, np);
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|
}
|
|
|
|
static void
|
|
free_proc(struct procinfo *p)
|
|
{
|
|
struct threadinfo *t, *t2;
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|
LIST_FOREACH_SAFE(t, &p->threadlist, entries, t2) {
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|
free(t);
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|
}
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|
LIST_REMOVE(p, entries);
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|
free(p);
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|
}
|
|
|
|
static void
|
|
detach_all_procs(struct trussinfo *info)
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|
{
|
|
struct procinfo *p, *p2;
|
|
|
|
LIST_FOREACH_SAFE(p, &info->proclist, entries, p2) {
|
|
detach_proc(p->pid);
|
|
free_proc(p);
|
|
}
|
|
}
|
|
|
|
static struct procinfo *
|
|
find_proc(struct trussinfo *info, pid_t pid)
|
|
{
|
|
struct procinfo *np;
|
|
|
|
LIST_FOREACH(np, &info->proclist, entries) {
|
|
if (np->pid == pid)
|
|
return (np);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Change curthread member based on (pid, lwpid).
|
|
*/
|
|
static void
|
|
find_thread(struct trussinfo *info, pid_t pid, lwpid_t lwpid)
|
|
{
|
|
struct procinfo *np;
|
|
struct threadinfo *nt;
|
|
|
|
np = find_proc(info, pid);
|
|
assert(np != NULL);
|
|
|
|
LIST_FOREACH(nt, &np->threadlist, entries) {
|
|
if (nt->tid == lwpid) {
|
|
info->curthread = nt;
|
|
return;
|
|
}
|
|
}
|
|
errx(1, "could not find thread");
|
|
}
|
|
|
|
/*
|
|
* When a process exits, it should have exactly one thread left.
|
|
* All of the other threads should have reported thread exit events.
|
|
*/
|
|
static void
|
|
find_exit_thread(struct trussinfo *info, pid_t pid)
|
|
{
|
|
struct procinfo *p;
|
|
|
|
p = find_proc(info, pid);
|
|
assert(p != NULL);
|
|
|
|
info->curthread = LIST_FIRST(&p->threadlist);
|
|
assert(info->curthread != NULL);
|
|
assert(LIST_NEXT(info->curthread, entries) == NULL);
|
|
}
|
|
|
|
static void
|
|
alloc_syscall(struct threadinfo *t, struct ptrace_lwpinfo *pl)
|
|
{
|
|
u_int i;
|
|
|
|
assert(t->in_syscall == 0);
|
|
assert(t->cs.number == 0);
|
|
assert(t->cs.sc == NULL);
|
|
assert(t->cs.nargs == 0);
|
|
for (i = 0; i < nitems(t->cs.s_args); i++)
|
|
assert(t->cs.s_args[i] == NULL);
|
|
memset(t->cs.args, 0, sizeof(t->cs.args));
|
|
t->cs.number = pl->pl_syscall_code;
|
|
t->in_syscall = 1;
|
|
}
|
|
|
|
static void
|
|
free_syscall(struct threadinfo *t)
|
|
{
|
|
u_int i;
|
|
|
|
for (i = 0; i < t->cs.nargs; i++)
|
|
free(t->cs.s_args[i]);
|
|
memset(&t->cs, 0, sizeof(t->cs));
|
|
t->in_syscall = 0;
|
|
}
|
|
|
|
static void
|
|
enter_syscall(struct trussinfo *info, struct threadinfo *t,
|
|
struct ptrace_lwpinfo *pl)
|
|
{
|
|
struct syscall *sc;
|
|
u_int i, narg;
|
|
|
|
alloc_syscall(t, pl);
|
|
narg = MIN(pl->pl_syscall_narg, nitems(t->cs.args));
|
|
if (narg != 0 && t->proc->abi->fetch_args(info, narg) != 0) {
|
|
free_syscall(t);
|
|
return;
|
|
}
|
|
|
|
sc = get_syscall(t, t->cs.number, narg);
|
|
if (sc->unknown)
|
|
fprintf(info->outfile, "-- UNKNOWN %s SYSCALL %d --\n",
|
|
t->proc->abi->type, t->cs.number);
|
|
|
|
t->cs.nargs = sc->nargs;
|
|
assert(sc->nargs <= nitems(t->cs.s_args));
|
|
|
|
t->cs.sc = sc;
|
|
|
|
/*
|
|
* At this point, we set up the system call arguments.
|
|
* We ignore any OUT ones, however -- those are arguments that
|
|
* are set by the system call, and so are probably meaningless
|
|
* now. This doesn't currently support arguments that are
|
|
* passed in *and* out, however.
|
|
*/
|
|
#if DEBUG
|
|
fprintf(stderr, "syscall %s(", sc->name);
|
|
#endif
|
|
for (i = 0; i < t->cs.nargs; i++) {
|
|
#if DEBUG
|
|
fprintf(stderr, "0x%lx%s", t->cs.args[sc->args[i].offset],
|
|
i < (t->cs.nargs - 1) ? "," : "");
|
|
#endif
|
|
if (!(sc->args[i].type & OUT)) {
|
|
t->cs.s_args[i] = print_arg(&sc->args[i],
|
|
t->cs.args, 0, info);
|
|
}
|
|
}
|
|
#if DEBUG
|
|
fprintf(stderr, ")\n");
|
|
#endif
|
|
|
|
clock_gettime(CLOCK_REALTIME, &t->before);
|
|
}
|
|
|
|
/*
|
|
* When a thread exits voluntarily (including when a thread calls
|
|
* exit() to trigger a process exit), the thread's internal state
|
|
* holds the arguments passed to the exit system call. When the
|
|
* thread's exit is reported, log that system call without a return
|
|
* value.
|
|
*/
|
|
static void
|
|
thread_exit_syscall(struct trussinfo *info)
|
|
{
|
|
struct threadinfo *t;
|
|
|
|
t = info->curthread;
|
|
if (!t->in_syscall)
|
|
return;
|
|
|
|
clock_gettime(CLOCK_REALTIME, &t->after);
|
|
|
|
print_syscall_ret(info, 0, NULL);
|
|
free_syscall(t);
|
|
}
|
|
|
|
static void
|
|
exit_syscall(struct trussinfo *info, struct ptrace_lwpinfo *pl)
|
|
{
|
|
struct threadinfo *t;
|
|
struct procinfo *p;
|
|
struct syscall *sc;
|
|
long retval[2];
|
|
u_int i;
|
|
int errorp;
|
|
|
|
t = info->curthread;
|
|
if (!t->in_syscall)
|
|
return;
|
|
|
|
clock_gettime(CLOCK_REALTIME, &t->after);
|
|
p = t->proc;
|
|
if (p->abi->fetch_retval(info, retval, &errorp) < 0) {
|
|
free_syscall(t);
|
|
return;
|
|
}
|
|
|
|
sc = t->cs.sc;
|
|
/*
|
|
* Here, we only look for arguments that have OUT masked in --
|
|
* otherwise, they were handled in enter_syscall().
|
|
*/
|
|
for (i = 0; i < sc->nargs; i++) {
|
|
char *temp;
|
|
|
|
if (sc->args[i].type & OUT) {
|
|
/*
|
|
* If an error occurred, then don't bother
|
|
* getting the data; it may not be valid.
|
|
*/
|
|
if (errorp) {
|
|
asprintf(&temp, "0x%lx",
|
|
t->cs.args[sc->args[i].offset]);
|
|
} else {
|
|
temp = print_arg(&sc->args[i],
|
|
t->cs.args, retval, info);
|
|
}
|
|
t->cs.s_args[i] = temp;
|
|
}
|
|
}
|
|
|
|
print_syscall_ret(info, errorp, retval);
|
|
free_syscall(t);
|
|
|
|
/*
|
|
* If the process executed a new image, check the ABI. If the
|
|
* new ABI isn't supported, stop tracing this process.
|
|
*/
|
|
if (pl->pl_flags & PL_FLAG_EXEC) {
|
|
assert(LIST_NEXT(LIST_FIRST(&p->threadlist), entries) == NULL);
|
|
p->abi = find_abi(p->pid);
|
|
if (p->abi == NULL) {
|
|
if (ptrace(PT_DETACH, p->pid, (caddr_t)1, 0) < 0)
|
|
err(1, "Can not detach the process");
|
|
free_proc(p);
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
print_line_prefix(struct trussinfo *info)
|
|
{
|
|
struct timespec timediff;
|
|
struct threadinfo *t;
|
|
int len;
|
|
|
|
len = 0;
|
|
t = info->curthread;
|
|
if (info->flags & (FOLLOWFORKS | DISPLAYTIDS)) {
|
|
if (info->flags & FOLLOWFORKS)
|
|
len += fprintf(info->outfile, "%5d", t->proc->pid);
|
|
if ((info->flags & (FOLLOWFORKS | DISPLAYTIDS)) ==
|
|
(FOLLOWFORKS | DISPLAYTIDS))
|
|
len += fprintf(info->outfile, " ");
|
|
if (info->flags & DISPLAYTIDS)
|
|
len += fprintf(info->outfile, "%6d", t->tid);
|
|
len += fprintf(info->outfile, ": ");
|
|
}
|
|
if (info->flags & ABSOLUTETIMESTAMPS) {
|
|
timespecsubt(&t->after, &info->start_time, &timediff);
|
|
len += fprintf(info->outfile, "%jd.%09ld ",
|
|
(intmax_t)timediff.tv_sec, timediff.tv_nsec);
|
|
}
|
|
if (info->flags & RELATIVETIMESTAMPS) {
|
|
timespecsubt(&t->after, &t->before, &timediff);
|
|
len += fprintf(info->outfile, "%jd.%09ld ",
|
|
(intmax_t)timediff.tv_sec, timediff.tv_nsec);
|
|
}
|
|
return (len);
|
|
}
|
|
|
|
static void
|
|
report_thread_death(struct trussinfo *info)
|
|
{
|
|
struct threadinfo *t;
|
|
|
|
t = info->curthread;
|
|
clock_gettime(CLOCK_REALTIME, &t->after);
|
|
print_line_prefix(info);
|
|
fprintf(info->outfile, "<thread %ld exited>\n", (long)t->tid);
|
|
}
|
|
|
|
static void
|
|
report_thread_birth(struct trussinfo *info)
|
|
{
|
|
struct threadinfo *t;
|
|
|
|
t = info->curthread;
|
|
clock_gettime(CLOCK_REALTIME, &t->after);
|
|
t->before = t->after;
|
|
print_line_prefix(info);
|
|
fprintf(info->outfile, "<new thread %ld>\n", (long)t->tid);
|
|
}
|
|
|
|
static void
|
|
report_exit(struct trussinfo *info, siginfo_t *si)
|
|
{
|
|
struct threadinfo *t;
|
|
|
|
t = info->curthread;
|
|
clock_gettime(CLOCK_REALTIME, &t->after);
|
|
print_line_prefix(info);
|
|
if (si->si_code == CLD_EXITED)
|
|
fprintf(info->outfile, "process exit, rval = %u\n",
|
|
si->si_status);
|
|
else
|
|
fprintf(info->outfile, "process killed, signal = %u%s\n",
|
|
si->si_status, si->si_code == CLD_DUMPED ?
|
|
" (core dumped)" : "");
|
|
}
|
|
|
|
static void
|
|
report_new_child(struct trussinfo *info)
|
|
{
|
|
struct threadinfo *t;
|
|
|
|
t = info->curthread;
|
|
clock_gettime(CLOCK_REALTIME, &t->after);
|
|
t->before = t->after;
|
|
print_line_prefix(info);
|
|
fprintf(info->outfile, "<new process>\n");
|
|
}
|
|
|
|
void
|
|
decode_siginfo(FILE *fp, siginfo_t *si)
|
|
{
|
|
const char *str;
|
|
|
|
fprintf(fp, " code=");
|
|
str = sysdecode_sigcode(si->si_signo, si->si_code);
|
|
if (str == NULL)
|
|
fprintf(fp, "%d", si->si_code);
|
|
else
|
|
fprintf(fp, "%s", str);
|
|
switch (si->si_code) {
|
|
case SI_NOINFO:
|
|
break;
|
|
case SI_QUEUE:
|
|
fprintf(fp, " value=%p", si->si_value.sival_ptr);
|
|
/* FALLTHROUGH */
|
|
case SI_USER:
|
|
case SI_LWP:
|
|
fprintf(fp, " pid=%jd uid=%jd", (intmax_t)si->si_pid,
|
|
(intmax_t)si->si_uid);
|
|
break;
|
|
case SI_TIMER:
|
|
fprintf(fp, " value=%p", si->si_value.sival_ptr);
|
|
fprintf(fp, " timerid=%d", si->si_timerid);
|
|
fprintf(fp, " overrun=%d", si->si_overrun);
|
|
if (si->si_errno != 0)
|
|
fprintf(fp, " errno=%d", si->si_errno);
|
|
break;
|
|
case SI_ASYNCIO:
|
|
fprintf(fp, " value=%p", si->si_value.sival_ptr);
|
|
break;
|
|
case SI_MESGQ:
|
|
fprintf(fp, " value=%p", si->si_value.sival_ptr);
|
|
fprintf(fp, " mqd=%d", si->si_mqd);
|
|
break;
|
|
default:
|
|
switch (si->si_signo) {
|
|
case SIGILL:
|
|
case SIGFPE:
|
|
case SIGSEGV:
|
|
case SIGBUS:
|
|
fprintf(fp, " trapno=%d", si->si_trapno);
|
|
fprintf(fp, " addr=%p", si->si_addr);
|
|
break;
|
|
case SIGCHLD:
|
|
fprintf(fp, " pid=%jd uid=%jd", (intmax_t)si->si_pid,
|
|
(intmax_t)si->si_uid);
|
|
fprintf(fp, " status=%d", si->si_status);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
report_signal(struct trussinfo *info, siginfo_t *si, struct ptrace_lwpinfo *pl)
|
|
{
|
|
struct threadinfo *t;
|
|
const char *signame;
|
|
|
|
t = info->curthread;
|
|
clock_gettime(CLOCK_REALTIME, &t->after);
|
|
print_line_prefix(info);
|
|
signame = sysdecode_signal(si->si_status);
|
|
if (signame == NULL)
|
|
signame = "?";
|
|
fprintf(info->outfile, "SIGNAL %u (%s)", si->si_status, signame);
|
|
if (pl->pl_event == PL_EVENT_SIGNAL && pl->pl_flags & PL_FLAG_SI)
|
|
decode_siginfo(info->outfile, &pl->pl_siginfo);
|
|
fprintf(info->outfile, "\n");
|
|
|
|
}
|
|
|
|
/*
|
|
* Wait for events until all the processes have exited or truss has been
|
|
* asked to stop.
|
|
*/
|
|
void
|
|
eventloop(struct trussinfo *info)
|
|
{
|
|
struct ptrace_lwpinfo pl;
|
|
siginfo_t si;
|
|
int pending_signal;
|
|
|
|
while (!LIST_EMPTY(&info->proclist)) {
|
|
if (detaching) {
|
|
detach_all_procs(info);
|
|
return;
|
|
}
|
|
|
|
if (waitid(P_ALL, 0, &si, WTRAPPED | WEXITED) == -1) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
err(1, "Unexpected error from waitid");
|
|
}
|
|
|
|
assert(si.si_signo == SIGCHLD);
|
|
|
|
switch (si.si_code) {
|
|
case CLD_EXITED:
|
|
case CLD_KILLED:
|
|
case CLD_DUMPED:
|
|
find_exit_thread(info, si.si_pid);
|
|
if ((info->flags & COUNTONLY) == 0) {
|
|
if (si.si_code == CLD_EXITED)
|
|
thread_exit_syscall(info);
|
|
report_exit(info, &si);
|
|
}
|
|
free_proc(info->curthread->proc);
|
|
info->curthread = NULL;
|
|
break;
|
|
case CLD_TRAPPED:
|
|
if (ptrace(PT_LWPINFO, si.si_pid, (caddr_t)&pl,
|
|
sizeof(pl)) == -1)
|
|
err(1, "ptrace(PT_LWPINFO)");
|
|
|
|
if (pl.pl_flags & PL_FLAG_CHILD) {
|
|
new_proc(info, si.si_pid, pl.pl_lwpid);
|
|
assert(LIST_FIRST(&info->proclist)->abi !=
|
|
NULL);
|
|
} else if (pl.pl_flags & PL_FLAG_BORN)
|
|
new_thread(find_proc(info, si.si_pid),
|
|
pl.pl_lwpid);
|
|
find_thread(info, si.si_pid, pl.pl_lwpid);
|
|
|
|
if (si.si_status == SIGTRAP &&
|
|
(pl.pl_flags & (PL_FLAG_BORN|PL_FLAG_EXITED|
|
|
PL_FLAG_SCE|PL_FLAG_SCX)) != 0) {
|
|
if (pl.pl_flags & PL_FLAG_BORN) {
|
|
if ((info->flags & COUNTONLY) == 0)
|
|
report_thread_birth(info);
|
|
} else if (pl.pl_flags & PL_FLAG_EXITED) {
|
|
if ((info->flags & COUNTONLY) == 0)
|
|
report_thread_death(info);
|
|
free_thread(info->curthread);
|
|
info->curthread = NULL;
|
|
} else if (pl.pl_flags & PL_FLAG_SCE)
|
|
enter_syscall(info, info->curthread, &pl);
|
|
else if (pl.pl_flags & PL_FLAG_SCX)
|
|
exit_syscall(info, &pl);
|
|
pending_signal = 0;
|
|
} else if (pl.pl_flags & PL_FLAG_CHILD) {
|
|
if ((info->flags & COUNTONLY) == 0)
|
|
report_new_child(info);
|
|
pending_signal = 0;
|
|
} else {
|
|
if ((info->flags & NOSIGS) == 0)
|
|
report_signal(info, &si, &pl);
|
|
pending_signal = si.si_status;
|
|
}
|
|
ptrace(PT_SYSCALL, si.si_pid, (caddr_t)1,
|
|
pending_signal);
|
|
break;
|
|
case CLD_STOPPED:
|
|
errx(1, "waitid reported CLD_STOPPED");
|
|
case CLD_CONTINUED:
|
|
break;
|
|
}
|
|
}
|
|
}
|