[Pharo-project] Linux FFI question: library given function name?
Hello all, In the short term, I'm looking for where I might find syslog() and friends, but a fishing lesson would be even better. How does one figure out in which library a named function lives? Bill
http://www.linuxselfhelp.com/HOWTO/Program-Library-HOWTO/miscellaneous.html 2009/10/27 Schwab,Wilhelm K <bschwab@anest.ufl.edu>
Hello all,
In the short term, I'm looking for where I might find syslog() and friends, but a fishing lesson would be even better. How does one figure out in which library a named function lives?
Bill
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
That seems to work. I found a similar looking script that did not. So far, it's sending me to a static library that I have yet to associate with anything that FFI can load, but it's progress. Thanks, Bill ________________________________ From: pharo-project-bounces@lists.gforge.inria.fr [mailto:pharo-project-bounces@lists.gforge.inria.fr] On Behalf Of Hernán Morales Durand Sent: Wednesday, October 28, 2009 9:53 AM To: Pharo-project@lists.gforge.inria.fr Subject: Re: [Pharo-project] Linux FFI question: library given function name? http://www.linuxselfhelp.com/HOWTO/Program-Library-HOWTO/miscellaneous.html 2009/10/27 Schwab,Wilhelm K <bschwab@anest.ufl.edu<mailto:bschwab@anest.ufl.edu>> Hello all, In the short term, I'm looking for where I might find syslog() and friends, but a fishing lesson would be even better. How does one figure out in which library a named function lives? Bill _______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr<mailto:Pharo-project@lists.gforge.inria.fr> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
Schwab,Wilhelm K wrote:
That seems to work. I found a similar looking script that did not. So far, it's sending me to a static library that I have yet to associate with anything that FFI can load, but it's progress.
I'm not an expert in this field, but I've gone fishing for similar things before. Here's what I did this time... There's a man page for syslog in sections 2 and 3. The syslog (2) man page (which is for the system call, I think not what you want) references "the C library function syslog()" which I think *is* probably what you're looking for. The fact that it says it's a C library function leads me to believe that it might be in libc, where a lot of this really fundamental stuff hides. So I look in /lib to see what libc*.so files there are, find /lib/libc-2.9.so, and try: objdump -T /lib/libc-2.9.so | grep syslog which prints this: 00000000000ccff0 g DF .text 0000000000000098 GLIBC_2.2.5 syslog 00000000000ccf60 g DF .text 000000000000008b GLIBC_2.4 __syslog_chk 00000000000ccf50 g DF .text 0000000000000010 GLIBC_2.2.5 vsyslog 00000000000cc960 g DF .text 00000000000005e2 GLIBC_2.4 __vsyslog_chk I suspect this is what you're looking for. Using nm on .so files reports that there are no symbols, so it's probably better to use objdump. Regards, -Martin
Martin, Objdump is a new one; I found readelf, which with the --symbols option seems to do the job, though the names look a little more C++ decorated. That loud thump (by the time it reached your location) you just heard was me slapping my head over missing /lib. Many thanks! Bill -----Original Message----- From: pharo-project-bounces@lists.gforge.inria.fr [mailto:pharo-project-bounces@lists.gforge.inria.fr] On Behalf Of Martin McClure Sent: Wednesday, October 28, 2009 3:12 PM To: Pharo-project@lists.gforge.inria.fr Subject: Re: [Pharo-project] Linux FFI question: library given function name? Schwab,Wilhelm K wrote:
That seems to work. I found a similar looking script that did not. So far, it's sending me to a static library that I have yet to associate with anything that FFI can load, but it's progress.
I'm not an expert in this field, but I've gone fishing for similar things before. Here's what I did this time... There's a man page for syslog in sections 2 and 3. The syslog (2) man page (which is for the system call, I think not what you want) references "the C library function syslog()" which I think *is* probably what you're looking for. The fact that it says it's a C library function leads me to believe that it might be in libc, where a lot of this really fundamental stuff hides. So I look in /lib to see what libc*.so files there are, find /lib/libc-2.9.so, and try: objdump -T /lib/libc-2.9.so | grep syslog which prints this: 00000000000ccff0 g DF .text 0000000000000098 GLIBC_2.2.5 syslog 00000000000ccf60 g DF .text 000000000000008b GLIBC_2.4 __syslog_chk 00000000000ccf50 g DF .text 0000000000000010 GLIBC_2.2.5 vsyslog 00000000000cc960 g DF .text 00000000000005e2 GLIBC_2.4 __vsyslog_chk I suspect this is what you're looking for. Using nm on .so files reports that there are no symbols, so it's probably better to use objdump. Regards, -Martin _______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
participants (3)
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Hernán Morales Durand -
Martin McClure -
Schwab,Wilhelm K