jehanne: completed termios and drafted (f)pathconf

I/O baudrate hard coded at 38400 (set functions fail with EINVAL).

fpathconf and pathconf fail with EINVAL

newlib/libc/sys/jehanne/libposix_conf.c

@@ -425,3 +425,11 @@ jehanne_fprint(2, "_fcntl_r(%d, %d, %d) from %#p\n", fd, cmd, arg, jehanne_getca
 	}
 	return POSIX_fcntl(errnop, fd, pcmd, arg);
 }
+
+int
+__fail_with_einval(void)
+{
+	int *errnop = &_REENT->_errno;
+	*errnop = EINVAL;
+	return -1;
+}

newlib/libc/sys/jehanne/sysfcntl.c

@@ -20,9 +20,24 @@
 #include <posix.h>
 #include <reent.h>
 
-extern _fcntl_r(struct _reent *r, int fd, int cmd, int arg);
+extern int __fail_with_einval(void);
+
 int
 fcntl(int fd, int cmd, int arg)
 {
 	return _fcntl_r (_REENT, fd, cmd, arg);
 }
+
+long
+fpathconf(int fildes, int name)
+{
+	extern int _fcntl_r(struct _reent *r, int fd, int cmd, int arg);
+	return __fail_with_einval();
+}
+
+long
+pathconf(const char *path, int name)
+{
+	extern int _fcntl_r(struct _reent *r, int fd, int cmd, int arg);
+	return __fail_with_einval();
+}

newlib/libc/sys/jehanne/termios.c

@@ -84,3 +84,29 @@ tcsetattr(int fd, int optactions, const struct termios *t)
 		return 0;
 	return -1;
 }
+
+speed_t
+cfgetispeed(const struct termios *t)
+{
+	return 38400;
+}
+
+speed_t
+cfgetospeed(const struct termios *t)
+{
+	return 38400;
+}
+
+int
+cfsetispeed(struct termios *tp, speed_t speed)
+{
+	extern int _fcntl_r(struct _reent *r, int fd, int cmd, int arg);
+	return __fail_with_einval();
+}
+
+int
+cfsetospeed(struct termios *tp, speed_t speed)
+{
+	extern int _fcntl_r(struct _reent *r, int fd, int cmd, int arg);
+	return __fail_with_einval();
+}