Re: Fix running ldd against multiple shared objects
On Fri, Apr 8, 2011 at 6:17 PM, Matthew Dempsky matt...@dempsky.org wrote: Diff below fixes ldd /usr/lib/*.so.* so that it outputs more than just the first shared object's dependencies, like the behavior from ldd /usr/bin/*. The issue is that dlopen(f, RTLD_TRACE) calls exit() after it's done. I looked into changing this to properly cleanup and return, but figured it was easier to just fork first like we already do for exec()-based tracing. ok? Is anybody interested in getting this diff in? Thanks
Re: Fix running ldd against multiple shared objects
hi. i have commented out the -x stuff for now, and removed it from usage(). the rest of your diff is for other people though, so i'll leave it there. jmc It isn't my diff, its from matthew@. I just diffed on top of it. thanks
Re: Fix running ldd against multiple shared objects
On Thu, Apr 28, 2011 at 05:26:35PM -0500, Amit Kulkarni wrote:
Diff below fixes ldd /usr/lib/*.so.* so that it outputs more than
just the first shared object's dependencies, like the behavior from
ldd /usr/bin/*.
The issue is that dlopen(f, RTLD_TRACE) calls exit() after it's done.
I looked into changing this to properly cleanup and return, but
figured it was easier to just fork first like we already do for
exec()-based tracing.
I was checking this diff after the libc.so and libm.so change today, to
verify what's on the machine.
ldd -x is unused, so I removed it from manpage and ldd.c, diff attached at
the very end of this email.
hi. i have commented out the -x stuff for now, and removed it from
usage(). the rest of your diff is for other people though, so i'll leave
it there.
jmc
when you do ldd /usr/lib/*.so.* you get a funny output
/usr/lib/libasn1.so.18.0:
StartEnd Type Open Ref GrpRef Name
000207297000 000207735000 dlib 10 0
/usr/lib/libasn1.so.18.0
/usr/lib/libc.so.58.0:
StartEnd Type Open Ref GrpRef Name
00020151d000 000201a03000 dlib 10 0
/usr/lib/libc.so.58.2
/usr/lib/libc.so.58.1:
StartEnd Type Open Ref GrpRef Name
000203abe000 000203fa4000 dlib 10 0
/usr/lib/libc.so.58.2
/usr/lib/libc.so.58.2:
StartEnd Type Open Ref GrpRef Name
000208fc4000 0002094aa000 dlib 10 0
/usr/lib/libc.so.58.2
/usr/lib/libc.so.59.1:
/usr/lib/libcom_err.so.18.0:
StartEnd Type Open Ref GrpRef Name
000203b1 000203fae000 dlib 10 0
/usr/lib/libcom_err.so.18.0
/usr/lib/libkvm.so.10.0:
StartEnd Type Open Ref GrpRef Name
000206891000 000206c9a000 dlib 10 0
/usr/lib/libkvm.so.10.0
/usr/lib/libm.so.5.2:
StartEnd Type Open Ref GrpRef Name
00020d6b1000 00020dacf000 dlib 10 0
/usr/lib/libm.so.5.3
/usr/lib/libm.so.5.3:
StartEnd Type Open Ref GrpRef Name
0002042ef000 00020470d000 dlib 10 0
/usr/lib/libm.so.5.3
/usr/lib/libmenu.so.5.0:
Notice that ldd now prints the correct file and the Start + End
sections are different but it prints the wrong filename for the Start +
End sections.
ldd now prints libc.so.58.2 for all Start + End sections and is silent
about current libc.so.59.1
ldd now prints libm.so.5.3 for both libm.so.5.2 libm.so.5.3
I checked freebsd changelog and saw they mention that ldd has problem
handling libc.so because ldd itself is linked with libc.so
http://svnweb.freebsd.org/base/head/usr.bin/ldd/ldd.c?view=log
Anyway, matthew's diff doesn't bail with exit 1 but bails out silently.
The modified diff which removes -x from manpage and code now follows...
I also deleted some unused headers.
thanks,
amit
Index: ldd.1
===
RCS file: /cvs/src/libexec/ld.so/ldd/ldd.1,v
retrieving revision 1.8
diff -u ldd.1
--- ldd.1 2 Mar 2009 09:27:34 - 1.8
+++ ldd.1 28 Apr 2011 22:20:04 -
@@ -32,7 +32,6 @@
.Nd list dynamic object dependencies
.Sh SYNOPSIS
.Nm ldd
-.Op Fl x
.Ar program ...
.Sh DESCRIPTION
.Nm
@@ -49,13 +48,6 @@
and then execs
.Ar program .
.Pp
-If
-.Nm
-is invoked with the
-.Fl x
-flag, the tags from
-.Ar program
-are listed without using current ldconfig configuration.
.Sh DIAGNOSTICS
Exit status 0 if no error.
Exit status 1 if arg error.
Index: ldd.c
===
RCS file: /cvs/src/libexec/ld.so/ldd/ldd.c,v
retrieving revision 1.14
diff -u ldd.c
--- ldd.c 2 Mar 2009 09:27:34 - 1.14
+++ ldd.c 28 Apr 2011 22:20:04 -
@@ -27,14 +27,10 @@
#include stdio.h
#include stdlib.h
#include elf_abi.h
-#include err.h
#include fcntl.h
-#include string.h
#include unistd.h
#include dlfcn.h
-#include sys/stat.h
-#include sys/mman.h
#include sys/wait.h
#include sys/param.h
@@ -44,23 +40,11 @@
int
main(int argc, char **argv)
{
- int c, xflag, ret;
+ int c, ret;
- xflag = 0;
- while ((c = getopt(argc, argv, x)) != -1) {
- switch (c) {
- case 'x':
- xflag = 1;
- break;
- default:
- usage();
- /*NOTREACHED*/
- }
- }
+ while ((c = getopt(argc, argv, )) != -1)
+ ; /* EMPTY */
- if (xflag)
- errx(1, -x not yet implemented);
-
argc -= optind;
argv += optind;
@@ -84,7 +68,7 @@
{
Re: Fix running ldd against multiple shared objects
Diff below fixes ldd /usr/lib/*.so.* so that it outputs more than
just the first shared object's dependencies, like the behavior from
ldd /usr/bin/*.
The issue is that dlopen(f, RTLD_TRACE) calls exit() after it's done.
I looked into changing this to properly cleanup and return, but
figured it was easier to just fork first like we already do for
exec()-based tracing.
I was checking this diff after the libc.so and libm.so change today, to
verify what's on the machine.
ldd -x is unused, so I removed it from manpage and ldd.c, diff attached at
the very end of this email.
when you do ldd /usr/lib/*.so.* you get a funny output
/usr/lib/libasn1.so.18.0:
StartEnd Type Open Ref GrpRef Name
000207297000 000207735000 dlib 10 0
/usr/lib/libasn1.so.18.0
/usr/lib/libc.so.58.0:
StartEnd Type Open Ref GrpRef Name
00020151d000 000201a03000 dlib 10 0
/usr/lib/libc.so.58.2
/usr/lib/libc.so.58.1:
StartEnd Type Open Ref GrpRef Name
000203abe000 000203fa4000 dlib 10 0
/usr/lib/libc.so.58.2
/usr/lib/libc.so.58.2:
StartEnd Type Open Ref GrpRef Name
000208fc4000 0002094aa000 dlib 10 0
/usr/lib/libc.so.58.2
/usr/lib/libc.so.59.1:
/usr/lib/libcom_err.so.18.0:
StartEnd Type Open Ref GrpRef Name
000203b1 000203fae000 dlib 10 0
/usr/lib/libcom_err.so.18.0
/usr/lib/libkvm.so.10.0:
StartEnd Type Open Ref GrpRef Name
000206891000 000206c9a000 dlib 10 0
/usr/lib/libkvm.so.10.0
/usr/lib/libm.so.5.2:
StartEnd Type Open Ref GrpRef Name
00020d6b1000 00020dacf000 dlib 10 0
/usr/lib/libm.so.5.3
/usr/lib/libm.so.5.3:
StartEnd Type Open Ref GrpRef Name
0002042ef000 00020470d000 dlib 10 0
/usr/lib/libm.so.5.3
/usr/lib/libmenu.so.5.0:
Notice that ldd now prints the correct file and the Start + End
sections are different but it prints the wrong filename for the Start +
End sections.
ldd now prints libc.so.58.2 for all Start + End sections and is silent
about current libc.so.59.1
ldd now prints libm.so.5.3 for both libm.so.5.2 libm.so.5.3
I checked freebsd changelog and saw they mention that ldd has problem
handling libc.so because ldd itself is linked with libc.so
http://svnweb.freebsd.org/base/head/usr.bin/ldd/ldd.c?view=log
Anyway, matthew's diff doesn't bail with exit 1 but bails out silently.
The modified diff which removes -x from manpage and code now follows...
I also deleted some unused headers.
thanks,
amit
Index: ldd.1
===
RCS file: /cvs/src/libexec/ld.so/ldd/ldd.1,v
retrieving revision 1.8
diff -u ldd.1
--- ldd.1 2 Mar 2009 09:27:34 - 1.8
+++ ldd.1 28 Apr 2011 22:20:04 -
@@ -32,7 +32,6 @@
.Nd list dynamic object dependencies
.Sh SYNOPSIS
.Nm ldd
-.Op Fl x
.Ar program ...
.Sh DESCRIPTION
.Nm
@@ -49,13 +48,6 @@
and then execs
.Ar program .
.Pp
-If
-.Nm
-is invoked with the
-.Fl x
-flag, the tags from
-.Ar program
-are listed without using current ldconfig configuration.
.Sh DIAGNOSTICS
Exit status 0 if no error.
Exit status 1 if arg error.
Index: ldd.c
===
RCS file: /cvs/src/libexec/ld.so/ldd/ldd.c,v
retrieving revision 1.14
diff -u ldd.c
--- ldd.c 2 Mar 2009 09:27:34 - 1.14
+++ ldd.c 28 Apr 2011 22:20:04 -
@@ -27,14 +27,10 @@
#include stdio.h
#include stdlib.h
#include elf_abi.h
-#include err.h
#include fcntl.h
-#include string.h
#include unistd.h
#include dlfcn.h
-#include sys/stat.h
-#include sys/mman.h
#include sys/wait.h
#include sys/param.h
@@ -44,23 +40,11 @@
int
main(int argc, char **argv)
{
- int c, xflag, ret;
+ int c, ret;
- xflag = 0;
- while ((c = getopt(argc, argv, x)) != -1) {
- switch (c) {
- case 'x':
- xflag = 1;
- break;
- default:
- usage();
- /*NOTREACHED*/
- }
- }
+ while ((c = getopt(argc, argv, )) != -1)
+ ; /* EMPTY */
- if (xflag)
- errx(1, -x not yet implemented);
-
argc -= optind;
argv += optind;
@@ -84,7 +68,7 @@
{
extern char *__progname;
- fprintf(stderr, usage: %s [-x] program ...\n, __progname);
+ fprintf(stderr, usage: %s program ...\n, __progname);
exit(1);
}
@@ -94,9 +78,9 @@
{
Elf_Ehdr ehdr;
Elf_Phdr *phdr;
- int fd, i, size, status, interp=0;
+ int fd, i, size, status, interp =
