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lib: Do not blindly set the _read and _write pointers to NULL

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Adding a read with the address of the thread pointer we want to
use will allow lib/thread.c to properly handle your thread pointers.
Instead we were setting the pointer to NULL before we passed
into the _read and _write thread functions.  Remove the NULL
pointer set and just let thread.c handle everything.

vty_stdio_resume and vty_read would blindly add read and write
which would cause vty_event() to drop the thread pointer.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2019-06-13 19:30:51 -04:00
parent 67e42128db
commit 43b8ca995b
1 changed files with 12 additions and 36 deletions
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48
lib/vty.c
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@ -1335,7 +1335,6 @@ static int vty_read(struct thread *thread)
int vty_sock = THREAD_FD(thread);
struct vty *vty = THREAD_ARG(thread);
vty->t_read = NULL;
/* Read raw data from socket */
if ((nbytes = read(vty->fd, buf, VTY_READ_BUFSIZ)) <= 0) {
@ -1529,13 +1528,9 @@ static int vty_flush(struct thread *thread)
int vty_sock = THREAD_FD(thread);
struct vty *vty = THREAD_ARG(thread);
vty->t_write = NULL;
/* Tempolary disable read thread. */
if ((vty->lines == 0) && vty->t_read) {
thread_cancel(vty->t_read);
vty->t_read = NULL;
}
if (vty->lines == 0)
THREAD_OFF(vty->t_read);
/* Function execution continue. */
erase = ((vty->status == VTY_MORE || vty->status == VTY_MORELINE));
@ -1713,12 +1708,9 @@ void vty_stdio_suspend(void)
if (!stdio_vty)
return;
if (stdio_vty->t_write)
thread_cancel(stdio_vty->t_write);
if (stdio_vty->t_read)
thread_cancel(stdio_vty->t_read);
if (stdio_vty->t_timeout)
thread_cancel(stdio_vty->t_timeout);
THREAD_OFF(stdio_vty->t_write);
THREAD_OFF(stdio_vty->t_read);
THREAD_OFF(stdio_vty->t_timeout);
if (stdio_termios)
tcsetattr(0, TCSANOW, &stdio_orig_termios);
@ -2077,7 +2069,6 @@ static int vtysh_read(struct thread *thread)
sock = THREAD_FD(thread);
vty = THREAD_ARG(thread);
vty->t_read = NULL;
if ((nbytes = read(sock, buf, VTY_READ_BUFSIZ)) <= 0) {
if (nbytes < 0) {
@ -2157,7 +2148,6 @@ static int vtysh_write(struct thread *thread)
{
struct vty *vty = THREAD_ARG(thread);
vty->t_write = NULL;
vtysh_flush(vty);
return 0;
}
@ -2193,12 +2183,9 @@ void vty_close(struct vty *vty)
bool was_stdio = false;
/* Cancel threads.*/
if (vty->t_read)
thread_cancel(vty->t_read);
if (vty->t_write)
thread_cancel(vty->t_write);
if (vty->t_timeout)
thread_cancel(vty->t_timeout);
THREAD_OFF(vty->t_read);
THREAD_OFF(vty->t_write);
THREAD_OFF(vty->t_timeout);
/* Flush buffer. */
buffer_flush_all(vty->obuf, vty->wfd);
@ -2254,7 +2241,6 @@ static int vty_timeout(struct thread *thread)
struct vty *vty;
vty = THREAD_ARG(thread);
vty->t_timeout = NULL;
vty->v_timeout = 0;
/* Clear buffer*/
@ -2651,25 +2637,20 @@ static void vty_event(enum event event, int sock, struct vty *vty)
vector_set_index(Vvty_serv_thread, sock, vty_serv_thread);
break;
case VTYSH_READ:
vty->t_read = NULL;
thread_add_read(vty_master, vtysh_read, vty, sock,
&vty->t_read);
break;
case VTYSH_WRITE:
vty->t_write = NULL;
thread_add_write(vty_master, vtysh_write, vty, sock,
&vty->t_write);
break;
#endif /* VTYSH */
case VTY_READ:
vty->t_read = NULL;
thread_add_read(vty_master, vty_read, vty, sock, &vty->t_read);
/* Time out treatment. */
if (vty->v_timeout) {
if (vty->t_timeout)
thread_cancel(vty->t_timeout);
vty->t_timeout = NULL;
THREAD_OFF(vty->t_timeout);
thread_add_timer(vty_master, vty_timeout, vty,
vty->v_timeout, &vty->t_timeout);
}
@ -2679,15 +2660,10 @@ static void vty_event(enum event event, int sock, struct vty *vty)
&vty->t_write);
break;
case VTY_TIMEOUT_RESET:
if (vty->t_timeout) {
thread_cancel(vty->t_timeout);
vty->t_timeout = NULL;
}
if (vty->v_timeout) {
vty->t_timeout = NULL;
THREAD_OFF(vty->t_timeout);
if (vty->v_timeout)
thread_add_timer(vty_master, vty_timeout, vty,
vty->v_timeout, &vty->t_timeout);
}
break;
}
}
@ -3024,7 +3000,7 @@ void vty_reset(void)
for (i = 0; i < vector_active(Vvty_serv_thread); i++)
if ((vty_serv_thread = vector_slot(Vvty_serv_thread, i))
!= NULL) {
thread_cancel(vty_serv_thread);
THREAD_OFF(vty_serv_thread);
vector_slot(Vvty_serv_thread, i) = NULL;
close(i);
}