core: add options to customize commands on system signals, quit by default on SIGHUP when not running headless (closes #1595)

New options to customize behavior on signals received, with the default
behavior:

- weechat.signal.sighup: quit in normal mode, reload config in headless
- weechat.signal.sigquit: quit
- weechat.signal.sigterm: quit
- weechat.signal.sigusr1: no command executed by default
- weechat.signal.sigusr2: no command executed by default

The signals SIGUSR1 and SIGUSR2 are introduced by this commit, so it's now
possible to run commands when they are received.

The SIGHUP signal makes now WeeChat quit, it was the behavior before version
2.9 of WeeChat (see commit de1e61f7cd50cbd1a99777fe6611642a51abf5f6).

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/ja/weechat_dev.ja.adoc b/doc/ja/weechat_dev.ja.adoc
index b77e1c426..9d2b712c1 100644
--- a/doc/ja/weechat_dev.ja.adoc
+++ b/doc/ja/weechat_dev.ja.adoc
@@ -148,6 +148,8 @@ WeeChat "core" は以下のディレクトリに配置されています:
 |    wee-secure.c                 | データ保護用の関数
 |    wee-secure-buffer.c          | データ保護用のバッファ
 |    wee-secure-config.c          | 安全なデータオプション (sec.conf ファイル)
+// TRANSLATION MISSING
+|    wee-signal.c                 | Signal functions.
 |    wee-string.c                 | 文字列関数
 |    wee-upgrade-file.c           | 内部アップグレードシステム
 |    wee-upgrade.c                | WeeChat コアのアップグレード (バッファ、行、履歴、...)
@@ -413,6 +415,8 @@ WeeChat "core" は以下のディレクトリに配置されています:
 |          test-core-infolist.cpp   | テスト: インフォリスト
 |          test-core-list.cpp       | テスト: リスト
 |          test-core-secure.cpp     | テスト: データ保護
+// TRANSLATION MISSING
+|          test-core-signal.cpp     | テスト: signals.
 |          test-core-string.cpp     | テスト: 文字列
 |          test-core-url.cpp        | テスト: URL
 |          test-core-utf8.cpp       | テスト: UTF-8