Hi, I was using gdb to debug postgres. In order to debug the backend of running query, I start postgres first and use "select * from pg_backend_pid()" to ask for backend pid. Then I start gdb in another bash window with "gdb postgres" and attach the pid obtained above and set the breakpoint. Then I run the query from the first window. However, the debugging precess which is shown below is not going to the breakpoint. I tried many different breakpoints, but it always start from the 305 client_read_ended().
GNU gdb 6.6 Copyright (C) 2006 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 "sparc-sun-solaris2.10"... (gdb) b qp_add_paths_to_joinrel Breakpoint 1 at 0x1a6744: file joinpath.c, line 67. (gdb) attach 23903 Attaching to program `/usrlocal/pgsql/bin/postgres', process 23903 Retry #1: Retry #2: Retry #3: Retry #4: [New LWP 1] 0xff0cbaa4 in _rt_boot () from /usr/lib/ld.so.1 (gdb) n Single stepping until exit from function _rt_boot, which has no line number information. secure_read (port=0x4a7760, ptr=0x455948, len=8192) at be-secure.c:305 305 client_read_ended(); (gdb) n pq_recvbuf () at pqcomm.c:767 767 if (r < 0) (gdb) n 769 if (errno == EINTR) (gdb) n 782 if (r == 0) (gdb) n 788 return EOF; (gdb) n 791 PqRecvLength += r; (gdb) Any one know what is going wrong? BTW, as you can see, the system is solaris. -- Best Regards Huang Qi Victor
