More info, if i do an 'n' and not an 's' in GDB there is no problem.
file: /apps/libc6/glibc-2.27/sysdeps/unix/sysv/linux/tcgetattr.c
``` /* Put the state of FD into *TERMIOS_P. */ int __tcgetattr (int fd, struct termios *termios_p) { struct __kernel_termios k_termios; int retval;
retval = INLINE_SYSCALL (ioctl, 3, fd, TCGETS, &k_termios);
if (__glibc_likely (retval == 0)) { termios_p->c_iflag = k_termios.c_iflag; termios_p->c_oflag = k_termios.c_oflag; termios_p->c_cflag = k_termios.c_cflag; termios_p->c_lflag = k_termios.c_lflag; termios_p->c_line = k_termios.c_line; #ifdef _HAVE_STRUCT_TERMIOS_C_ISPEED # ifdef _HAVE_C_ISPEED termios_p->c_ispeed = k_termios.c_ispeed; # else termios_p->c_ispeed = k_termios.c_cflag & (CBAUD | CBAUDEX); # endif #endif #ifdef _HAVE_STRUCT_TERMIOS_C_OSPEED # ifdef _HAVE_C_OSPEED termios_p->c_ospeed = k_termios.c_ospeed; # else termios_p->c_ospeed = k_termios.c_cflag & (CBAUD | CBAUDEX); # endif #endif if (sizeof (cc_t) == 1 || _POSIX_VDISABLE == 0 || (unsigned char) _POSIX_VDISABLE == (unsigned char) -1) memset (__mempcpy (&termios_p->c_cc[0], &k_termios.c_cc[0], __KERNEL_NCCS * sizeof (cc_t)), _POSIX_VDISABLE, (NCCS - __KERNEL_NCCS) * sizeof (cc_t)); else { memcpy (&termios_p->c_cc[0], &k_termios.c_cc[0], __KERNEL_NCCS * sizeof (cc_t));
for (size_t cnt = __KERNEL_NCCS; cnt < NCCS; ++cnt) termios_p->c_cc[cnt] = _POSIX_VDISABLE; } }
return retval; } ```