int context_attach(pid_t pid, ContextAttachCallBack * done, void * data, int mode) {
Context * ctx = NULL;
assert(done != NULL);
trace(LOG_CONTEXT, "context: attaching pid %d", pid);
if ((mode & CONTEXT_ATTACH_SELF) == 0 && ptrace(PT_ATTACH, pid, 0, 0) < 0) {
int err = errno;
trace(LOG_ALWAYS, "error: ptrace(PT_ATTACH) failed: pid %d, error %d %s",
pid, err, errno_to_str(err));
errno = err;
return -1;
}
add_waitpid_process(pid);
ctx = create_context(pid2id(pid, 0));
ctx->mem = ctx;
ctx->mem_access |= MEM_ACCESS_INSTRUCTION;
ctx->mem_access |= MEM_ACCESS_DATA;
ctx->mem_access |= MEM_ACCESS_USER;
ctx->big_endian = big_endian_host();
EXT(ctx)->pid = pid;
EXT(ctx)->attach_callback = done;
EXT(ctx)->attach_data = data;
list_add_first(&ctx->ctxl, &pending_list);
/* TODO: context_attach works only for main task in a process */
return 0;
}
static void command_start(char * token, Channel * c) {
int pid = 0;
int err = 0;
char dir[FILE_PATH_SIZE];
char exe[FILE_PATH_SIZE];
char ** args = NULL;
char ** envp = NULL;
int args_len = 0;
int envp_len = 0;
int attach = 0;
int selfattach = 0;
int pending = 0;
ChildProcess * prs = NULL;
Trap trap;
if (set_trap(&trap)) {
json_read_string(&c->inp, dir, sizeof(dir));
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
json_read_string(&c->inp, exe, sizeof(exe));
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
args = json_read_alloc_string_array(&c->inp, &args_len);
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
envp = json_read_alloc_string_array(&c->inp, &envp_len);
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
attach = json_read_boolean(&c->inp);
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
if (read_stream(&c->inp) != MARKER_EOM) exception(ERR_JSON_SYNTAX);
if (dir[0] != 0 && chdir(dir) < 0) err = errno;
if (err == 0 && start_process(c, envp, dir, exe, args, attach, &pid, &selfattach, &prs) < 0) err = errno;
if (prs != NULL) {
write_process_input(prs);
prs->out_struct = read_process_output(prs, prs->out, prs->out_id, sizeof(prs->out_id));
if (prs->out != prs->err) prs->err_struct = read_process_output(prs, prs->err, prs->err_id, sizeof(prs->err_id));
strncpy(prs->name, exe, sizeof(prs->name) - 1);
}
if (!err) {
if (attach) {
AttachDoneArgs * data = loc_alloc_zero(sizeof *data);
data->c = c;
strcpy(data->token, token);
pending = context_attach(pid, start_done, data, selfattach) == 0;
if (pending) {
stream_lock(c);
}
else {
err = errno;
loc_free(data);
}
}
else {
add_waitpid_process(pid);
}
}
if (!pending) {
write_stringz(&c->out, "R");
write_stringz(&c->out, token);
write_errno(&c->out, err);
if (err || pid == 0) {
write_stringz(&c->out, "null");
}
else {
write_context(&c->out, pid);
write_stream(&c->out, 0);
}
write_stream(&c->out, MARKER_EOM);
}
clear_trap(&trap);
}
loc_free(args);
loc_free(envp);
if (trap.error) exception(trap.error);
}