Date: Wed, 03 Jul 2002 08:28:05 +0300 From: Angelin Lazarov Lalev <alalev@uni-svishtov.bg> To: questions@freebsd.org Subject: Where did I go wrong with gdb52 Message-ID: <3D228B65.7040708@uni-svishtov.bg>
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(The gdb52 was compiled from yesterday's ports.
My system is FreeBSD 4.6 Stable, 21 Jun, compiled with "make buildworld
CFLAGS=-g")
(I was debuging a mail filter for sendmail with libmilter.)
bash-2.05a# cd /usr/home/lalev/gapd/
bash-2.05a# make clean && make && make install
rm -r gapd.o
gcc -c -g gapd.c
gapd.c: In function `gapd_envfrom':
gapd.c:33: warning: assignment makes pointer from integer without a cast
gapd.c:34: warning: comparison between pointer and integer
gapd.c: In function `main':
gapd.c:96: warning: assignment from incompatible pointer type
gapd.c:97: warning: assignment from incompatible pointer type
gcc -g -o gapd gapd.o -lmilter -pthread
mkdir -p /usr/local/bin
mkdir -p /var/spool/gapd
chown root.wheel /var/spool/gapd
install -o root -g wheel -m 755 gapd /usr/local/bin
bash-2.05a# /usr/local/bin/gapd
bash-2.05a# ps -ax|grep gapd
281 ?? Ss 0:00.00 /usr/local/bin/gapd
283 p0 S+ 0:00.01 grep gapd
232 v7 I+ 0:03.45 emacs gapd.c
bash-2.05a# gdb52 /usr/local/bin/gapd 281
GNU gdb 5.2 (FreeBSD)
Copyright 2002 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 "i386-portbld-freebsd4.6"...
Attaching to program: /usr/local/bin/gapd, process 281
Reading symbols from /usr/lib/libmilter.so.2...done.
Loaded symbols for /usr/lib/libmilter.so.2
Reading symbols from /usr/lib/libc_r.so.4...done.
Loaded symbols for /usr/lib/libc_r.so.4
Reading symbols from /usr/libexec/ld-elf.so.1...done.
Loaded symbols for /usr/libexec/ld-elf.so.1
[Switching to Process 281, Thread 1]
0x280e3c38 in _thread_sys_poll () from /usr/lib/libc_r.so.4
(gdb) b gapd_envfrom
Breakpoint 1 at 0x8048833: file gapd.c, line 28.
(gdb) l gapd_envfrom
19 /*
20 * gapd_envfrom - When this function is called from libmilter, it
creates a
21 * file with unique name in which is stored the message, received
further on.
22 */
23
24 sfsistat gapd_envfrom (SMFICTX *ctx, char ** argv[]) {
25 char *tempstr;
26 char *filename;
27
28 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "gapd_envfrom was just
called!");
(gdb) l
29
filename=(char*)malloc(strlen(FILENAME_TEMPLATE)+strlen(SPOOL_DIR)+1);
30 strcpy(filename, SPOOL_DIR);
31 strcat(filename, FILENAME_TEMPLATE);
32 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "The temporary file is
%s.", filename);
33 TEMPFILE=mkstemp(filename);
34 if (TEMPFILE==-1) {
35 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "Error creating the
temporary file!");
36 exit(201);
37 } else {
38 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "Temporary file is
created successfully!");
(gdb) l
39 fprintf(TEMPFILE, "%s: %s", "X-Probe", "successful");
40 }
41 return SMFIS_CONTINUE;
42 }
43
44 sfsistat gapd_envrcpt (SMFICTX *ctx, char ** argv[]) {
45 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "gapd_envrcpt was just
called!");
46 return SMFIS_CONTINUE;
47 }
48
(gdb) b gapd_envfrom
(gdb) c
Continuing.
[Switching to Process 281, Thread 4]
Breakpoint 1, gapd_envfrom (ctx=0x805e300, argv=0x8060050) at gapd.c:28
28 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "gapd_envfrom was just
called!");
(gdb) s
29
filename=(char*)malloc(strlen(FILENAME_TEMPLATE)+strlen(SPOOL_DIR)+1);
(gdb) s
Program received signal SIGSEGV, Segmentation fault.
0x280e4f56 in _flockfile_debug () from /usr/lib/libc_r.so.4
(gdb) bt
#0 0x280e4f56 in _flockfile_debug () from /usr/lib/libc_r.so.4
#1 0x280e51f1 in flockfile () from /usr/lib/libc_r.so.4
#2 0x28124ebd in vfprintf () from /usr/lib/libc_r.so.4
#3 0x28124945 in fprintf () from /usr/lib/libc_r.so.4
#4 0x0804892c in gapd_envfrom (ctx=0x805e300, argv=0x8060050) at gapd.c:39
#5 0x28071827 in mi_clr_macros () from /usr/lib/libmilter.so.2
#6 0x28070ba1 in mi_engine () from /usr/lib/libmilter.so.2
#7 0x28070738 in mi_handle_session () from /usr/lib/libmilter.so.2
#8 0x2806fbd7 in mi_thread_handle_wrapper () from /usr/lib/libmilter.so.2
#9 0x280924f3 in _thread_start () from /usr/lib/libc_r.so.4
(strange, I did not called fprintf on that row where the SIGSEGV was
received).
(gdb) kill
Kill the program being debugged? (y or n) y
(gdb) quit
bash-2.05a# rm /var/run/gapd.sock
bash-2.05a# /usr/local/bin/gapd
bash-2.05a# ps -ax|grep gapd
289 ?? Ss 0:00.00 /usr/local/bin/gapd
232 v7 I+ 0:03.45 emacs gapd.c
bash-2.05a# gdb /usr/local/bin/gapd 289
GNU gdb 4.18 (FreeBSD)
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 "i386-unknown-freebsd"...
/usr/home/lalev/gapd/289: No such file or directory.
Attaching to program: /usr/local/bin/gapd, process 289
Reading symbols from /usr/lib/libmilter.so.2...done.
Reading symbols from /usr/lib/libc_r.so.4...done.
Reading symbols from /usr/libexec/ld-elf.so.1...done.
0x280e3c38 in _thread_sys_poll () from /usr/lib/libc_r.so.4
(gdb) b gapd_h envfrom
Breakpoint 1 at 0x8048833: file gapd.c, line 28.
(gdb) c
Continuing.
[Switching to process 289, thread 4]
Breakpoint 1, gapd_envfrom (ctx=0x805e300, argv=0x8060050) at gapd.c:28
28 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "gapd_envfrom was just
called!");
(gdb) s
29
filename=(char*)malloc(strlen(FILENAME_TEMPLATE)+strlen(SPOOL_DIR)+1);
(gdb) s
30 strcpy(filename, SPOOL_DIR);
(gdb) s
31 strcat(filename, FILENAME_TEMPLATE);
(gdb) s
32 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "The temporary file is
%s.", filename);
(gdb) s
33 TEMPFILE=mkstemp(filename);
(gdb) s
34 if (TEMPFILE==-1) {
(gdb) s
38 syslog(LOG_MAKEPRI(LOG_MAIL, LOG_INFO), "Temporary file is
created successfully!");
(gdb) s
39 fprintf(TEMPFILE, "%s: %s", "X-Probe", "successful");
(gdb) s
Program received signal SIGSEGV, Segmentation fault.
0x280e4f56 in _flockfile_debug () from /usr/lib/libc_r.so.4
(gdb) bt
#0 0x280e4f56 in _flockfile_debug () from /usr/lib/libc_r.so.4
#1 0x280e51f1 in flockfile () from /usr/lib/libc_r.so.4
#2 0x28124ebd in vfprintf () from /usr/lib/libc_r.so.4
#3 0x28124945 in fprintf () from /usr/lib/libc_r.so.4
#4 0x804892c in gapd_envfrom (ctx=0x805e300, argv=0x8060050) at gapd.c:39
#5 0x28071827 in mi_clr_macros () from /usr/lib/libmilter.so.2
#6 0x28070ba1 in mi_engine () from /usr/lib/libmilter.so.2
#7 0x28070738 in mi_handle_session () from /usr/lib/libmilter.so.2
#8 0x2806fbd7 in mi_thread_handle_wrapper () from /usr/lib/libmilter.so.2
#9 0x280924f3 in _thread_start () from /usr/lib/libc_r.so.4
#10 0x0 in ?? ()
(gdb) kill
Kill the program being debugged? (y or n) y
(gdb) quit
bash-2.05a#
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