155 	pid_t chld = fork();  in main()  local
156 	if (chld < 0)  in main()
159 	if (chld == 0) {  in main()
185 	if (waitpid(chld, &status, 0) != chld || !WIFSTOPPED(status))  in main()
190 	if (ptrace(PTRACE_GETREGS, chld, NULL, &regs) != 0)  in main()
208 	if (ptrace(PTRACE_SETREGS, chld, NULL, &regs2) != 0)  in main()
210 	if (ptrace(PTRACE_CONT, chld, NULL, NULL) != 0)  in main()
214 	if (waitpid(chld, &status, 0) != chld || !WIFSTOPPED(status))  in main()
218 	if (ptrace(PTRACE_SETREGS, chld, NULL, &regs) != 0)  in main()
220 	if (ptrace(PTRACE_DETACH, chld, NULL, NULL) != 0)  in main()
224 	if (waitpid(chld, &status, 0) != chld)  in main()