| Current Path : /usr/src/tools/test/ptrace/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/tools/test/ptrace/scescx.c |
/*-
* Copyright (c) 2011, 2012 Konstantin Belousov <kib@FreeBSD.org>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/tools/test/ptrace/scescx.c 231443 2012-02-10 21:33:12Z kib $");
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define TRACE ">>>> "
static const char *
decode_wait_status(int status)
{
static char c[128];
char b[32];
int first;
c[0] = '\0';
first = 1;
if (WIFCONTINUED(status)) {
first = 0;
strlcat(c, "CONT", sizeof(c));
}
if (WIFEXITED(status)) {
if (first)
first = 0;
else
strlcat(c, ",", sizeof(c));
snprintf(b, sizeof(b), "EXIT(%d)", WEXITSTATUS(status));
strlcat(c, b, sizeof(c));
}
if (WIFSIGNALED(status)) {
if (first)
first = 0;
else
strlcat(c, ",", sizeof(c));
snprintf(b, sizeof(b), "SIG(%s)", strsignal(WTERMSIG(status)));
strlcat(c, b, sizeof(c));
if (WCOREDUMP(status))
strlcat(c, ",CORE", sizeof(c));
}
if (WIFSTOPPED(status)) {
if (first)
first = 0;
else
strlcat(c, ",", sizeof(c));
snprintf(b, sizeof(b), "SIG(%s)", strsignal(WSTOPSIG(status)));
strlcat(c, b, sizeof(c));
}
return (c);
}
static const char *
decode_pl_flags(struct ptrace_lwpinfo *lwpinfo)
{
static char c[128];
static struct decode_tag {
int flag;
const char *desc;
} decode[] = {
{ PL_FLAG_SA, "SA" },
{ PL_FLAG_BOUND, "BOUND" },
{ PL_FLAG_SCE, "SCE" },
{ PL_FLAG_SCX, "SCX" },
{ PL_FLAG_EXEC, "EXEC" },
{ PL_FLAG_SI, "SI" },
{ PL_FLAG_FORKED, "FORKED" },
};
char de[32];
unsigned first, flags, i;
c[0] = '\0';
first = 1;
flags = lwpinfo->pl_flags;
for (i = 0; i < sizeof(decode) / sizeof(decode[0]); i++) {
if ((flags & decode[i].flag) != 0) {
if (first)
first = 0;
else
strlcat(c, ",", sizeof(c));
strlcat(c, decode[i].desc, sizeof(c));
flags &= ~decode[i].flag;
}
}
for (i = 0; i < sizeof(flags) * NBBY; i++) {
if ((flags & (1 << i)) != 0) {
if (first)
first = 0;
else
strlcat(c, ",", sizeof(c));
snprintf(de, sizeof(de), "<%d>", i);
strlcat(c, de, sizeof(c));
}
}
return (c);
}
static const char *
decode_pl_event(struct ptrace_lwpinfo *lwpinfo)
{
switch (lwpinfo->pl_event) {
case PL_EVENT_NONE:
return ("NONE");
case PL_EVENT_SIGNAL:
return ("SIG");
default:
return ("UNKNOWN");
}
}
static void
get_pathname(pid_t pid)
{
char pathname[PATH_MAX];
int error, name[4];
size_t len;
name[0] = CTL_KERN;
name[1] = KERN_PROC;
name[2] = KERN_PROC_PATHNAME;
name[3] = pid;
len = sizeof(pathname);
error = sysctl(name, 4, pathname, &len, NULL, 0);
if (error < 0) {
if (errno != ESRCH) {
fprintf(stderr, "sysctl kern.proc.pathname.%d: %s\n",
pid, strerror(errno));
return;
}
fprintf(stderr, "pid %d exited\n", pid);
return;
}
if (len == 0 || strlen(pathname) == 0) {
fprintf(stderr, "No cached pathname for process %d\n", pid);
return;
}
printf(TRACE "pid %d path %s\n", pid, pathname);
}
static void
wait_info(int pid, int status, struct ptrace_lwpinfo *lwpinfo)
{
printf(TRACE "pid %d wait %s", pid,
decode_wait_status(status));
if (lwpinfo != NULL) {
printf(" event %s flags %s",
decode_pl_event(lwpinfo), decode_pl_flags(lwpinfo));
}
printf("\n");
}
static int
trace_sc(int pid)
{
struct ptrace_lwpinfo lwpinfo;
int status;
if (ptrace(PT_TO_SCE, pid, (caddr_t)1, 0) < 0) {
perror("PT_TO_SCE");
ptrace(PT_KILL, pid, NULL, 0);
return (-1);
}
if (waitpid(pid, &status, 0) == -1) {
perror("waitpid");
return (-1);
}
if (WIFEXITED(status) || WIFSIGNALED(status)) {
wait_info(pid, status, NULL);
return (-1);
}
assert(WIFSTOPPED(status));
assert(WSTOPSIG(status) == SIGTRAP);
if (ptrace(PT_LWPINFO, pid, (caddr_t)&lwpinfo, sizeof(lwpinfo)) < 0) {
perror("PT_LWPINFO");
ptrace(PT_KILL, pid, NULL, 0);
return (-1);
}
wait_info(pid, status, &lwpinfo);
assert(lwpinfo.pl_flags & PL_FLAG_SCE);
if (ptrace(PT_TO_SCX, pid, (caddr_t)1, 0) < 0) {
perror("PT_TO_SCX");
ptrace(PT_KILL, pid, NULL, 0);
return (-1);
}
if (waitpid(pid, &status, 0) == -1) {
perror("waitpid");
return (-1);
}
if (WIFEXITED(status) || WIFSIGNALED(status)) {
wait_info(pid, status, NULL);
return (-1);
}
assert(WIFSTOPPED(status));
assert(WSTOPSIG(status) == SIGTRAP);
if (ptrace(PT_LWPINFO, pid, (caddr_t)&lwpinfo, sizeof(lwpinfo)) < 0) {
perror("PT_LWPINFO");
ptrace(PT_KILL, pid, NULL, 0);
return (-1);
}
wait_info(pid, status, &lwpinfo);
assert(lwpinfo.pl_flags & PL_FLAG_SCX);
if (lwpinfo.pl_flags & PL_FLAG_EXEC)
get_pathname(pid);
if (lwpinfo.pl_flags & PL_FLAG_FORKED) {
printf(TRACE "forked child %d\n", lwpinfo.pl_child_pid);
return (lwpinfo.pl_child_pid);
}
return (0);
}
static int
trace_cont(int pid)
{
struct ptrace_lwpinfo lwpinfo;
int status;
if (ptrace(PT_CONTINUE, pid, (caddr_t)1, 0) < 0) {
perror("PT_CONTINUE");
ptrace(PT_KILL, pid, NULL, 0);
return (-1);
}
if (waitpid(pid, &status, 0) == -1) {
perror("waitpid");
return (-1);
}
if (WIFEXITED(status) || WIFSIGNALED(status)) {
wait_info(pid, status, NULL);
return (-1);
}
assert(WIFSTOPPED(status));
assert(WSTOPSIG(status) == SIGTRAP);
if (ptrace(PT_LWPINFO, pid, (caddr_t)&lwpinfo, sizeof(lwpinfo)) < 0) {
perror("PT_LWPINFO");
ptrace(PT_KILL, pid, NULL, 0);
return (-1);
}
wait_info(pid, status, &lwpinfo);
if ((lwpinfo.pl_flags & (PL_FLAG_EXEC | PL_FLAG_SCX)) ==
(PL_FLAG_EXEC | PL_FLAG_SCX))
get_pathname(pid);
if ((lwpinfo.pl_flags & (PL_FLAG_FORKED | PL_FLAG_SCX)) ==
(PL_FLAG_FORKED | PL_FLAG_SCX)) {
printf(TRACE "forked child %d\n", lwpinfo.pl_child_pid);
return (lwpinfo.pl_child_pid);
}
return (0);
}
static int trace_syscalls = 1;
static int
trace(pid_t pid)
{
return (trace_syscalls ? trace_sc(pid) : trace_cont(pid));
}
int
main(int argc, char *argv[])
{
struct ptrace_lwpinfo lwpinfo;
int c, status, use_vfork;
pid_t pid, pid1;
trace_syscalls = 1;
use_vfork = 0;
while ((c = getopt(argc, argv, "csv")) != -1) {
switch (c) {
case 'c':
trace_syscalls = 0;
break;
case 's':
trace_syscalls = 1;
break;
case 'v':
use_vfork = 1;
break;
default:
case '?':
fprintf(stderr, "Usage: %s [-c] [-s] [-v]\n", argv[0]);
return (2);
}
}
if ((pid = fork()) < 0) {
perror("fork");
return 1;
}
else if (pid == 0) {
if (ptrace(PT_TRACE_ME, 0, NULL, 0) < 0) {
perror("PT_TRACE_ME");
_exit(1);
}
kill(getpid(), SIGSTOP);
getpid();
if ((pid1 = use_vfork ? vfork() : fork()) < 0) {
perror("fork1");
return (1);
} else if (pid1 == 0) {
printf("Hi from child %d\n", getpid());
execl("/bin/ls", "ls", "/", (char *)NULL);
}
}
else { /* parent */
if (waitpid(pid, &status, 0) == -1) {
perror("waitpid");
return (-1);
}
assert(WIFSTOPPED(status));
assert(WSTOPSIG(status) == SIGSTOP);
if (ptrace(PT_LWPINFO, pid, (caddr_t)&lwpinfo,
sizeof(lwpinfo)) < 0) {
perror("PT_LWPINFO");
ptrace(PT_KILL, pid, NULL, 0);
return (-1);
}
wait_info(pid, status, &lwpinfo);
if (ptrace(PT_FOLLOW_FORK, pid, 0, 1) < 0) {
perror("PT_FOLLOW_FORK");
ptrace(PT_KILL, pid, NULL, 0);
return (2);
}
while ((pid1 = trace(pid)) >= 0) {
if (pid1 != 0) {
printf(TRACE "attached to pid %d\n", pid1);
#if 0
kill(pid1, SIGCONT);
#endif
if (waitpid(pid1, &status, 0) == -1) {
perror("waitpid");
return (-1);
}
printf(TRACE "nested loop, pid %d status %s\n",
pid1, decode_wait_status(status));
assert(WIFSTOPPED(status));
assert(WSTOPSIG(status) == SIGSTOP);
if (ptrace(PT_LWPINFO, pid1, (caddr_t)&lwpinfo,
sizeof(lwpinfo)) < 0) {
perror("PT_LWPINFO");
ptrace(PT_KILL, pid1, NULL, 0);
return (-1);
}
wait_info(pid1, status, &lwpinfo);
while (trace(pid1) >= 0)
;
}
}
ptrace(PT_CONTINUE, pid, (caddr_t)1, 0);
}
return (0);
}