[ruby-talk:02344] rb_catch

 How work rb_catch ?

pigeon% cat tt.c
#include <ruby.h>

static VALUE toto() { return Qtrue; }

void 
Init_tt()
{
    rb_catch("begin", toto, 0);
}
pigeon% 
pigeon% make
gcc -fPIC -I/usr/lib/ruby/1.4/i386-linux -g -O2 -fPIC  -I/usr/include    -c tt.c -o tt.o
gcc -shared   -o tt.so tt.o -lc 
pigeon% gdb ~/ruby/ruby-1.4.3/ruby
GNU gdb 19990928
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...
(gdb) r -e 'require "tt"'
Starting program: /home/ts/ruby/ruby-1.4.3/ruby -e 'require "tt"'

Program received signal SIGSEGV, Segmentation fault.
rb_to_id (name=3156) at ruby.h:524
524         return BUILTIN_TYPE(obj);
(gdb) bt
#0  rb_to_id (name=3156) at ruby.h:524
#1  0x805ebe2 in rb_f_catch (dmy=0, tag=3156) at eval.c:7532
#2  0x805ece7 in catch_i (tag=6313) at eval.c:7551
#3  0x8056dd6 in rb_iterate (it_proc=0x805ecd0 <catch_i>, data1=6313, 
    bl_proc=0x40014780 <toto>, data2=0) at eval.c:3423
#4  0x805ed11 in rb_catch (tag=0x4001483c "begin", proc=0x40014780 <toto>, 
    data=0) at eval.c:7560
#5  0x400147b7 in Init_tt () at tt.c:8
#6  0x80a2ab2 in dln_load (file=0x80efc60 "./tt.so") at dln.c:1282
#7  0x8059fbd in rb_f_require (obj=1075265236, fname=1075216096) at eval.c:4875
#8  0x8057868 in call_cfunc (func=0x8059c58 <rb_f_require>, recv=1075265236, 
    len=1, argc=1, argv=0xbffff5a4) at eval.c:3731
#9  0x8057d31 in rb_call0 (klass=1075268756, recv=1075265236, id=8137, argc=1, 
    argv=0xbffff5a4, body=0x40168cb4, nosuper=1) at eval.c:3864
#10 0x8058447 in rb_call (klass=1075268756, recv=1075265236, mid=8137, argc=1, 
    argv=0xbffff5a4, scope=1) at eval.c:4060
#11 0x8053f1c in rb_eval (self=1075265236, node=0x40167f1c) at eval.c:2234
#12 0x8051265 in eval_node (self=1075265236) at eval.c:1012
#13 0x8051354 in ruby_run () at eval.c:1048
#14 0x804ff46 in main (argc=3, argv=0xbffffcd4, envp=0xbffffce4) at main.c:39
(gdb) q
The program is running.  Exit anyway? (y or n) y
pigeon% 


Guy Decoux