static const
pid_t _gen_child() {
uint8_t buf[PAGE_SIZE];
mem_assign(buf, PAGE_SIZE, TRAP, TRAP_SZ);
uint8_t *elf;
const size_t elf_sz = gen_elf(&elf, options.start, (uint8_t *)buf, PAGE_SIZE);
const int exe_fd = write_exe(elf, elf_sz, options.savefile);
free(elf);
const pid_t tracee = fork();
if (tracee < 0) {
perror("fork");
exit(EXIT_FAILURE);
} else if (tracee == 0) {
ptrace_child(exe_fd);
abort();
}
// Parent
close(exe_fd);
return tracee;
}
static int start_ptraced_child(void)
{
int pid, n, status;
pid = fork();
if (pid == 0)
ptrace_child();
else if (pid < 0)
fatal_perror("start_ptraced_child : fork failed");
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if (n < 0)
fatal_perror("check_ptrace : waitpid failed");
if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
fatal("check_ptrace : expected SIGSTOP, got status = %d",
status);
return pid;
}
