Improvements to catch, return, signal, try

Improve the ability to rethrow errors
* Allow return to rethrow an error by accepting '-errorinfo stacktrace'
* Also, 'catch ... opts' now also stores opts(-errorinfo) on error
* Use these to provide better stack traces from 'case' and 'try'
* Implement 'return -level'
Make try/on/finally more Tcl 8.6 compatible
* With support for 'on' handlers and docs
Add support for catch options to try
* Otherwise it's hard to use try to catch signals
Improvements to signal handling
* catch -signal now sets a list of the handled signals as the result
* catch -signal won't execute the body at all if a handled signal is pending
* up to 64 (jim_wide) signals can now be handled
* if catch -signal is nested, the innermost catch will catch the error
* new 'signal catch' allows ignored/blocked signals to be examined and cleared.
* update docs on signal handling
exec should indicate which signal killed the child

Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 4 insertions, 3 deletions

diff --git a/jim.h.in b/jim.h.in
index 81c9f70..e578c07 100644
--- a/jim.h.in
+++ b/jim.h.in
@@ -494,11 +494,12 @@ typedef struct Jim_Interp {
     int numLevels; /* Number of current nested calls. */
     int maxNestingDepth; /* Used for infinite loop detection. */
     int returnCode; /* Completion code to return on JIM_RETURN. */
+    int returnLevel; /* Current level of 'return -level' */
     int exitCode; /* Code to return to the OS on JIM_EXIT. */
-    int signal; /* A caught signal, or 0 if none */
-    int signal_level; /* A nesting level of catch -signal */
     long id; /* Hold unique id for various purposes */
-    const char *(*signal_to_name)(int sig); /* Returns a name for the signal number */
+    int signal_level; /* A nesting level of catch -signal */
+    jim_wide sigmask;  /* Bit mask of caught signals, or 0 if none */
+    int (*signal_set_result)(struct Jim_Interp *interp, jim_wide sigmask); /* Set a result for the sigmask */
     Jim_CallFrame *framePtr; /* Pointer to the current call frame */
     Jim_CallFrame *topFramePtr; /* toplevel/global frame pointer. */
     struct Jim_HashTable commands; /* Commands hash table */