Add bash 5.2 to third_party

third_party/bash/quit.h

@@ -0,0 +1,75 @@
+/* quit.h -- How to handle SIGINT gracefully. */
+
+/* Copyright (C) 1993-2021 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Bash is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#if !defined (_QUIT_H_)
+#define _QUIT_H_
+
+#include "sig.h"	/* for sig_atomic_t */
+
+/* Non-zero means SIGINT has already occurred. */
+extern volatile sig_atomic_t interrupt_state;
+extern volatile sig_atomic_t terminating_signal;
+
+/* Macro to call a great deal.  SIGINT just sets the interrupt_state variable.
+   When it is safe, put QUIT in the code, and the "interrupt" will take
+   place.  The same scheme is used for terminating signals (e.g., SIGHUP)
+   and the terminating_signal variable.  That calls a function which will
+   end up exiting the shell. */
+#define QUIT \
+  do { \
+    if (terminating_signal) termsig_handler (terminating_signal); \
+    if (interrupt_state) throw_to_top_level (); \
+  } while (0)
+
+#define SETINTERRUPT interrupt_state = 1
+#define CLRINTERRUPT interrupt_state = 0
+
+#define ADDINTERRUPT interrupt_state++
+#define DELINTERRUPT interrupt_state--
+
+#define ISINTERRUPT interrupt_state != 0
+
+/* The same sort of thing, this time just for signals that would ordinarily
+   cause the shell to terminate. */
+
+#define CHECK_TERMSIG \
+  do { \
+    if (terminating_signal) termsig_handler (terminating_signal); \
+  } while (0)
+
+#define LASTSIG() \
+  (terminating_signal ? terminating_signal : (interrupt_state ? SIGINT : 0))
+
+#define CHECK_WAIT_INTR \
+  do { \
+    if (wait_intr_flag && wait_signal_received && this_shell_builtin && (this_shell_builtin == wait_builtin)) \
+      sh_longjmp (wait_intr_buf, 1); \
+  } while (0)
+
+#define RESET_SIGTERM \
+  do { \
+    sigterm_received = 0; \
+  } while (0)
+
+#define CHECK_SIGTERM \
+  do { \
+    if (sigterm_received) termsig_handler (SIGTERM); \
+  } while (0)
+#endif /* _QUIT_H_ */