/opt/pg18d/bin/psql -p 5435
postgres=# select pg_backend_pid();
pg_backend_pid
2543087
(1 row)
postgres=#
gdb postgres 2543087
gdb postgres 2543087
GNU gdb (Red Hat Enterprise Linux) 16.3-2.0.1.el9
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postgres: No such file or directory.
Attaching to process 2543087
Reading symbols from /opt/pg18d/bin/postgres...
Reading symbols from /lib64/libz.so.1...
Reading symbols from /usr/lib/debug/usr/lib64/libz.so.1.2.11-1.2.11-40.el9.x86_64.debug...
Reading symbols from /lib64/libm.so.6...
Reading symbols from /usr/lib/debug/usr/lib64/libm.so.6-2.34-275.0.1.el9_8.x86_64.debug...
Reading symbols from /lib64/libicui18n.so.67...
Reading symbols from /usr/lib/debug/usr/lib64/libicui18n.so.67.1-67.1-10.el9_6.x86_64.debug...
Reading symbols from /lib64/libicuuc.so.67...
Reading symbols from /usr/lib/debug/usr/lib64/libicuuc.so.67.1-67.1-10.el9_6.x86_64.debug...
Reading symbols from /lib64/libc.so.6...
Reading symbols from /usr/lib/debug/usr/lib64/libc.so.6-2.34-275.0.1.el9_8.x86_64.debug...
Reading symbols from /lib64/ld-linux-x86-64.so.2...
Reading symbols from /lib64/libstdc++.so.6...
Reading symbols from /usr/lib/debug/usr/lib64/libstdc++.so.6.0.29-11.5.0-14.0.1.el9.x86_64.debug...
Reading symbols from /lib64/libgcc_s.so.1...
Reading symbols from /usr/lib/debug/usr/lib64/libgcc_s-11-20240719.so.1-11.5.0-14.0.1.el9.x86_64.debug...
Reading symbols from /lib64/libicudata.so.67...
Reading symbols from /usr/lib/debug/usr/lib64/libicudata.so.67.1-67.1-10.el9_6.x86_64.debug...
(No debugging symbols found in /usr/lib/debug/usr/lib64/libicudata.so.67.1-67.1-10.el9_6.x86_64.debug)
Thread debugging using libthread_db enabled
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007fef2410fdda in epoll_wait (epfd=6, events=0x2ef6990, maxevents=1, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
30 return SYSCALL_CANCEL (epoll_wait, epfd, events, maxevents, timeout);
(gdb)
设置断点：
(gdb) b ExecResult
Breakpoint 1 at 0x7c6677: file nodeResult.c, line 69.
(gdb)
psql执行select 1;
postgres=# select 1;
gdb输入c
(gdb) c
Continuing.
Breakpoint 1, ExecResult (pstate=0x2fd3768) at nodeResult.c:69
69 ResultState *node = castNode(ResultState, pstate);
(gdb)
gdb输入bt
gdb输入list可以查看当前
gdb输入up,down
