Internal breakpoints

[ankit thukral]

 hi all,
      i was debugging a program using GDB (in linux)
 and realized that GDB puts some breakpoints of it's
 own known as internal breakpoints.they are visible
 on
 issuing the following command :
 
 (gdb) maintainence info breakpoints
 
 -2  shlib events   keep y   0x4000c9c0
 <_dl_debug_state_internal>
         breakpoint already hit 3 times
 -7  longjmp        keep n   0x4000f870 <longjmp>
 -8  longjmp        keep n   0x42027240 <siglongjmp>
 -9  longjmp        keep n   0x42027240 <siglongjmp>
 -10 longjmp resume keep n   0x00000000
 
        can anyone explain to me in detail what are
 these for?
 
 thanks in advance,
 ankit.
 

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