From b2cb05b53e61d162044f71227e0ffeacbf59a4bb Mon Sep 17 00:00:00 2001
From: Loong Wang <wangl.cc@outlook.com>
Date: Mon, 11 Apr 2022 06:56:08 +0800
Subject: [PATCH] feat(events): support SIGWINCH for Signal event #18029

closes #15411
---
 runtime/doc/autocmd.txt                 |  2 +-
 src/nvim/os/signal.c                    | 24 +++++++++++++++++++++++-
 test/functional/autocmd/signal_spec.lua |  6 ++++++
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 7cfac4b5d1..e3cd28e353 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -870,7 +870,7 @@ ShellCmdPost			After executing a shell command with |:!cmd|,
 							*Signal*
 Signal				After Nvim receives a signal. The pattern is
 				matched against the signal name. Only
-				"SIGUSR1" is supported.  Example: >
+				"SIGUSR1" and "SIGWINCH" are supported.  Example: >
 				    autocmd Signal SIGUSR1 call some#func()
 <							*ShellFilterPost*
 ShellFilterPost			After executing a shell command with
diff --git a/src/nvim/os/signal.c b/src/nvim/os/signal.c
index 327ab6bc48..79e042b8a5 100644
--- a/src/nvim/os/signal.c
+++ b/src/nvim/os/signal.c
@@ -21,7 +21,7 @@
 #include "nvim/os/signal.h"
 #include "nvim/vim.h"
 
-static SignalWatcher spipe, shup, squit, sterm, susr1;
+static SignalWatcher spipe, shup, squit, sterm, susr1, swinch;
 #ifdef SIGPWR
 static SignalWatcher spwr;
 #endif
@@ -53,6 +53,9 @@ void signal_init(void)
 #endif
 #ifdef SIGUSR1
   signal_watcher_init(&main_loop, &susr1, NULL);
+#endif
+#ifdef SIGWINCH
+  signal_watcher_init(&main_loop, &swinch, NULL);
 #endif
   signal_start();
 }
@@ -70,6 +73,9 @@ void signal_teardown(void)
 #ifdef SIGUSR1
   signal_watcher_close(&susr1, NULL);
 #endif
+#ifdef SIGWINCH
+  signal_watcher_close(&swinch, NULL);
+#endif
 }
 
 void signal_start(void)
@@ -88,6 +94,9 @@ void signal_start(void)
 #ifdef SIGUSR1
   signal_watcher_start(&susr1, on_signal, SIGUSR1);
 #endif
+#ifdef SIGWINCH
+  signal_watcher_start(&swinch, on_signal, SIGWINCH);
+#endif
 }
 
 void signal_stop(void)
@@ -106,6 +115,9 @@ void signal_stop(void)
 #ifdef SIGUSR1
   signal_watcher_stop(&susr1);
 #endif
+#ifdef SIGWINCH
+  signal_watcher_stop(&swinch);
+#endif
 }
 
 void signal_reject_deadly(void)
@@ -140,6 +152,10 @@ static char *signal_name(int signum)
 #ifdef SIGUSR1
   case SIGUSR1:
     return "SIGUSR1";
+#endif
+#ifdef SIGWINCH
+  case SIGWINCH:
+    return "SIGWINCH";
 #endif
   default:
     return "Unknown";
@@ -197,6 +213,12 @@ static void on_signal(SignalWatcher *handle, int signum, void *data)
     apply_autocmds(EVENT_SIGNAL, (char_u *)"SIGUSR1", curbuf->b_fname, true,
                    curbuf);
     break;
+#endif
+#ifdef SIGWINCH
+  case SIGWINCH:
+    apply_autocmds(EVENT_SIGNAL, (char_u *)"SIGWINCH", curbuf->b_fname, true,
+                   curbuf);
+    break;
 #endif
   default:
     ELOG("invalid signal: %d", signum);
diff --git a/test/functional/autocmd/signal_spec.lua b/test/functional/autocmd/signal_spec.lua
index 719adeaf1b..d4f65cc61d 100644
--- a/test/functional/autocmd/signal_spec.lua
+++ b/test/functional/autocmd/signal_spec.lua
@@ -30,6 +30,12 @@ describe('autocmd Signal', function()
     eq({'notification', 'foo', {}}, next_msg())
   end)
 
+  it('matches SIGWINCH', function()
+    command('autocmd Signal SIGWINCH call rpcnotify(1, "foo")')
+    posix_kill('WINCH', funcs.getpid())
+    eq({'notification', 'foo', {}}, next_msg())
+  end)
+
   it('does not match unknown patterns', function()
     command('autocmd Signal SIGUSR2 call rpcnotify(1, "foo")')
     posix_kill('USR1', funcs.getpid())