On Tue, Feb 08, 2005 at 10:24:29AM -0600, Dan Nelson wrote: > In the last episode (Feb 08), Loren M. Lang said: > > I'm looking for a replacement for the strace program I used to use on > > linux; freebsd has a port of strace, but it just hangs everytime I > > use it. It looks like the bsd version of strace would be > > ktrace/kdump. I was able to get these to print a trace of the > > program I ran, but it doesn't do all the nice substatuting that > > strace was able to do. Mainly, I just want the first argument of open > > to look like a string instead of a 32 bit pointer that I can't read. > > I'm trying to figure out what files this program is trying to read so > > I can edit it's configuration file. > > The string in the NAMI line immediately after an open() call is the > filename in kdump output.
Oh, I never noticed this since I was using grep to filter out the open suyscalls. In strace everything is in one line. Is there anything then that will work like the -e option in strace so I can list just the syscalls I want to see? > > strace actually does work, but I think it's losing a race when it > forks the child process. Try suspending and resuming strace: > > ([EMAIL PROTECTED]) /home/dan> strace date > <hangs here, hit ^Z> > ^Z > zsh: 62219 suspended strace date > [1] + suspended strace date > ([EMAIL PROTECTED]) /home/dan> fg > [1] + continued strace date > execve(0xbfbfdef4, [0xbfbfe3b8], [/* 0 vars */]) = 0 > mmap(0, 3920, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0) = 0x28071000 > munmap(0x28071000, 3920) = 0 > ... This does work. > > strace hasn't been updated in a while, though, and has problems parsing > newer syscalls. Take a look at the truss command in the base system, > which does about the same thing as strace. Ktrace has the advantage > that it's less intrusive; both strace and truss have to stop the > process to print out data, which really slow it down. > > -- > Dan Nelson > [EMAIL PROTECTED] -- I sense much NT in you. NT leads to Bluescreen. Bluescreen leads to downtime. Downtime leads to suffering. NT is the path to the darkside. Powerful Unix is. Public Key: ftp://ftp.tallye.com/pub/lorenl_pubkey.asc Fingerprint: B3B9 D669 69C9 09EC 1BCD 835A FAF3 7A46 E4A3 280C _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
