diff options
| author |   Dave Barach <dave@barachs.net> | 2017-10-13 19:16:56 -0400 |
|---|---|---|
| committer |   Florin Coras <florin.coras@gmail.com> | 2017-10-16 02:33:49 +0000 |
| commit | 84db40e02e74efabe094e0d46ed2fafd348d126d (patch) | |
| tree | acb97b6c2274bfdb45770347a6033b68ebff0545 | |
| parent | b5518bedd95bea9c30cebcd5b0db76bd00f30a80 (diff) | |
VPP-1029: Don't call clib_longjmp(...) directly from the SIGTERM handler
It's way too easy to imagine leaving a mutex or a spin-lock held in
the /vpe-api shared-memory segment, or elsewhere. Set a volatile
variable and check it in a safe place...
Change-Id: I9d91c38cffeb921143c272162d055c9c24a6c312
Signed-off-by: Dave Barach <dave@barachs.net>
(cherry picked from commit 903651caf320dfdaabd20a0e6f3cd0ffc843e02f)
| -rw-r--r-- | src/vlib/main.h | 5 | ||||
| -rw-r--r-- | src/vlib/unix/main.c | 7 |
2 files changed, 8 insertions, 4 deletions
diff --git a/src/vlib/main.h b/src/vlib/main.h index fb67334e4e2..4288d6f0388 100644 --- a/src/vlib/main.h +++ b/src/vlib/main.h @@ -85,6 +85,8 @@ typedef struct vlib_main_t /* Jump target to exit main loop with given code. */ u32 main_loop_exit_set; + /* Set e.g. in the SIGTERM signal handler, checked in a safe place... */ + volatile u32 main_loop_exit_now; clib_longjmp_t main_loop_exit; #define VLIB_MAIN_LOOP_EXIT_NONE 0 #define VLIB_MAIN_LOOP_EXIT_PANIC 1 @@ -340,6 +342,9 @@ vlib_increment_main_loop_counter (vlib_main_t * vm) vm->main_loop_nodes_processed = 0; vm->vector_counts_per_main_loop[i] = v; vm->node_counts_per_main_loop[i] = n; + + if (PREDICT_FALSE (vm->main_loop_exit_now)) + clib_longjmp (&vm->main_loop_exit, VLIB_MAIN_LOOP_EXIT_CLI); } always_inline void vlib_set_queue_signal_callback diff --git a/src/vlib/unix/main.c b/src/vlib/unix/main.c index ed0631ec871..f286c870b80 100644 --- a/src/vlib/unix/main.c +++ b/src/vlib/unix/main.c @@ -75,7 +75,7 @@ VLIB_INIT_FUNCTION (unix_main_init); static void unix_signal_handler (int signum, siginfo_t * si, ucontext_t * uc) { - uword fatal; + uword fatal = 0; u8 *msg = 0; msg = format (msg, "received signal %U, PC %U", @@ -91,10 +91,9 @@ unix_signal_handler (int signum, siginfo_t * si, ucontext_t * uc) if (unix_main.vlib_main->main_loop_exit_set) { syslog (LOG_ERR | LOG_DAEMON, "received SIGTERM, exiting..."); - - clib_longjmp (&unix_main.vlib_main->main_loop_exit, - VLIB_MAIN_LOOP_EXIT_CLI); + unix_main.vlib_main->main_loop_exit_now = 1; } + break; /* fall through */ case SIGQUIT: case SIGINT: |