Although I checked the manuals several time, I haven't found the origin of the name strace but it is likely system-call trace, since this is obvious. There are three bigger notes to say about strace. Note 1: Both these functions strace and ltrace are using the system call ptrace. So ptrace system call is effectively how strace works.

It can be installed on Debian/Ubuntu (and many other systems) with pip3 install strace-process-tree. The process below to capture data is the same for both (but use strace-process-tree instead to create the graph). Thanks Jan Tojnar. It seems the perl script may suffer from bit rot. For a cross platform solution with older busybox type ps, it ...

Mar 31, 2011 · strace works by using the ptrace system call which causes the kernel to halt the program being traced each time it enters or exits the kernel via a system call. The tracing program (in this case strace) can then inspect the state of the program by using ptrace. strace gets the arguments to each system call depending on how that system works. On ...

Mar 8, 2012 · strace now has new options to track file descriptors:--decode-fds=set Decode various information associated with file descriptors. The default is decode-fds=none. set can include the following elements: path Print file paths.

Feb 4, 2013 · strace -fp PID just does the right thing on my system (Ubuntu 20.04.1 LTS). The strace manual page points this out:-f Trace child processes as they are created by currently traced processes as a result of the fork(2), vfork(2) and clone(2) system calls.

Sep 8, 2014 · Since strace can't report the return value (or any modified structure "output" values) until such call completes, it splits the report into two parts: the call initiation with "unfinished" and the call completion with "resumed." This has strace …

The strace command is normally used as in strace commandname command args and it launches commandname-- easy, but in this Android use case, not helpful. However, strace has a -p option which is helpful to you: strace -p <process id> will let …

Aug 12, 2022 · If ART is also using those syscalls, strace is basically useless and you're better off with plain old logging. That was the problem I ran into, because I was trying to spot deadlocks, but because ART is constantly profiling the Java side of the app to find hot methods to JIT, the strace output was uselessly noisy.

Mar 25, 2011 · This should tell you why the first strace is blocked. # strace -p 32035 Process 32035 attached - interrupt to quit ^Z # bg [1]+ strace -p 32035 & # ps uax|grep strace root 1886 0.0 0.0 103452 840 pts/2 S+ 05:59 0:00 grep strace root 30114 0.0 0.0 4452 572 pts/2 S 05:59 0:00 strace -p 32035 # strace -p 30114 Process 30114 attached - interrupt to ...

Jun 21, 2012 · With strace it is possible to see the ioctl call for the certain file descriptor and with certain command. The third argument is a structure, but strace shows it as a raw pointer to the memory. strace output example: open("/dev/node", O_RDWR) = …