New --reexec option.

This helps with setuid hash bang scripting on Mac OS,
and other plaforms where the interpreter executed out
of a hash bang script runs with orinary privilege,
even if marked setuid.

* sysif.c (exec_wrap): Static function turns extern.

* sysif.h (exec-wrap): Declared.

* txr.1: Documented --reexec. Added notes about setuid under
Hash Bang Support.

* txr.c (help): List --reexec option.
(txr_main): Implement --reexec option.

1 files changed, 1 insertions, 1 deletions

diff --git a/sysif.c b/sysif.c
index d7272dcf..e9c422ec 100644
--- a/sysif.c
+++ b/sysif.c
@@ -524,7 +524,7 @@ static val dup_wrap(val old, val neu)
   return num(dup2(c_num(old), c_num(neu)));
 }
 
-static val exec_wrap(val file, val args_opt)
+val exec_wrap(val file, val args_opt)
 {
   val args = default_bool_arg(args_opt);
   int nargs = c_num(length(args)) + 1;