gdb procedure

pr64452_gdb.txt (text/plain), 2.94 KB, created by Yann Ylavic on 2020-05-19 19:27:06 UTC

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Description: gdb procedure

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Creator: Yann Ylavic

Created: 2020-05-19 19:27:06 UTC

Size: 2.94 KB

patch

obsolete

># gdb --args /path/to/httpd -f /path/to/httpd.conf -X >[...] >Reading symbols from bin/httpd...done. > >(gdb) break spool_reqbody_cl >Function "spool_reqbody_cl" not defined. >Make breakpoint pending on future shared library load? (y or [n]) y >Breakpoint 1 (spool_reqbody_cl) pending. > >(gdb) run >Starting program: /path/to/httpd -f /path/to/httpd.conf -X >[...] ># here httpd is waiting for input, run the from the browser or curl terminal > >Thread 5 "httpd" hit Breakpoint 1, spool_reqbody_cl (req=0x7fffe00044d0, bytes_spooled=0x7ffff59d9910) at mod_proxy_http.c:432 >432 apr_pool_t *p = req->p; >(gdb) break apr_file_mktemp >Breakpoint 2 at 0x7ffff7ea1a7f: file file_io/unix/mktemp.c, line 182. >(gdb) break file_cleanup >Breakpoint 3 at 0x7ffff7ea1b8a: file file_io/unix/open.c, line 31. >(gdb) continue >Continuing. > ># the two first breakpoints are for another file for me, so I simply continue through them >Thread 5 "httpd" hit Breakpoint 2, apr_file_mktemp (fp=0x7ffff59d9780, template=0x7fffe0006e38 "/tmp/apr-tmp.XXXXXX", flags=0, p=0x7fffe0002b98) at file_io/unix/mktemp.c:182 >182 APR_FOPEN_DELONCLOSE : flags; >(gdb) continue >Continuing. > >Thread 5 "httpd" hit Breakpoint 3, file_cleanup (file=0x7fffe0006e50, is_child=0) at file_io/unix/open.c:31 >31 apr_status_t rv = APR_SUCCESS; >(gdb) print *file >$6 = {pool = 0x7fffe0002b98, filedes = 13, fname = 0x7fffe0006ec8 "/tmp/apr-tmp.zmSk2p", flags = 2375, eof_hit = 0, is_pipe = 0, timeout = -1, buffered = 0, blocking = BLK_UNKNOWN, ungetchar = -1, > buffer = 0x0, bufpos = 0, bufsize = 0, dataRead = 0, direction = 0, filePtr = 0, thlock = 0x0} >(gdb) continue >Continuing. > ># now the relevant file, let's continue until file cleanup >Thread 5 "httpd" hit Breakpoint 2, apr_file_mktemp (fp=0x7ffff59d9868, template=0x7fffe0006f08 "/tmp/modproxy.tmp.XXXXXX", flags=0, p=0x7fffe0002b98) at file_io/unix/mktemp.c:182 >182 APR_FOPEN_DELONCLOSE : flags; >(gdb) continue >Continuing. > ># here we are, step into the function with "next" >Thread 5 "httpd" hit Breakpoint 3, file_cleanup (file=0x7fffe0006f28, is_child=0) at file_io/unix/open.c:31 >31 apr_status_t rv = APR_SUCCESS; >(gdb) print *file >$7 = {pool = 0x7fffe0002b98, filedes = 13, fname = 0x7fffe0006fa0 "/tmp/modproxy.tmp.DB9KbL", flags = 2375, eof_hit = 0, is_pipe = 0, timeout = -1, buffered = 0, blocking = BLK_UNKNOWN, ungetchar = -1, > buffer = 0x0, bufpos = 0, bufsize = 0, dataRead = 0, direction = 0, filePtr = 0, thlock = 0x0} >(gdb) next >32 int fd = file->filedes; >(gdb) next >37 file->filedes = -1; >(gdb) next >39 if (close(fd) == 0) { >(gdb) next >41 if (!is_child && (file->flags & APR_FOPEN_DELONCLOSE)) { >(gdb) next >42 unlink(file->fname); ># the above unlink() should delete the temporary file >(gdb) next >45 if (file->thlock) { > ># so here "/tmp/modproxy.tmp.DB9KbL" shouldn't exist anymore ># can you reach this point or something went wrong/elsewhere before? > ># don't care thereafter, so to leave... >(gdb) quit View Attachment As Raw

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