Add a simple scripting facility to DDB(4), allowing the user to

define a set of named scripts.  Each script consists of a list of DDB
commands separated by ";"s that will be executed verbatim.  No higher
level language constructs, such as branching, are provided for:
scripts are executed by sequentially injecting commands into the DDB
input buffer.

Four new commands are present in DDB: "run" to run a specific script,
"script" to define or print a script, "scripts" to list currently
defined scripts, and "unscript" to delete a script, modeled on shell
alias commands.  Scripts may also be manipulated using sysctls in the
debug.ddb.scripting MIB space, although users will prefer to use the
soon-to-be-added ddb(8) tool for usability reasons.

Scripts with certain names are automatically executed on various DDB
events, such as entering the debugger via a panic, a witness error,
watchdog, breakpoint, sysctl, serial break, etc, allowing customized
handling.

MFC after:	3 months

1 files changed, 7 insertions, 4 deletions

diff --git a/sys/ddb/db_lex.h b/sys/ddb/db_lex.h
index 07955e9dc5cd..8713a27055f1 100644
--- a/sys/ddb/db_lex.h
+++ b/sys/ddb/db_lex.h
@@ -36,10 +36,12 @@
 /*
  * Lexical analyzer.
  */
-void	db_flush_lex(void);
-int	db_read_line(void);
-int	db_read_token(void);
-void	db_unread_token(int t);
+void	 db_flush_lex(void);
+char	*db_get_line(void);
+void	 db_inject_line(const char *command);
+int	 db_read_line(void);
+int	 db_read_token(void);
+void	 db_unread_token(int t);
 
 extern db_expr_t	db_tok_number;
 #define	TOK_STRING_SIZE		120
@@ -66,5 +68,6 @@ extern char	db_tok_string[TOK_STRING_SIZE];
 #define	tSHIFT_L	18
 #define	tSHIFT_R	19
 #define	tDOTDOT		20
+#define	tSEMI		21
 
 #endif /* !_DDB_DB_LEX_H_ */