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 ...

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.

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.

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 …

Jan 27, 2018 · It turns out strace truncates string output - you have to explicitly tell it that you want more than the first n (10?) string chars. You do this with -s 800. strace -s 800 -ff ./myprogram You can also get all the write commands by asking strace explicitly with -e write. strace -s 800 -ff -e write ./myprogram

Nov 11, 2013 · strace -e write=1 echo foo This will write all syscalls, and in addition to these, the data written to fd 1. strace -e trace=none -e write=1 echo foo This will generate no output except for the output from the program itself. It seems you have to trace write if you want to see its data. strace -e trace=write -e write=1 echo foo

Nov 10, 2014 · Most likely that strace output simply slows down the process making deadlocks much less likely. I have seen this happen before with strace OR can happen when adding other debug printing or debug calls. Deadlocks most often seen with multi-threaded interaction. But in your case you have multiple processes.

Jan 17, 2020 · The specifics for building strace from source will depend on: a) your particular Linux, b) your particular toolchain, and . c) your strace source. Take a look at this article: it should get you pointed in the right direction: Cross compiling for ARM with Ubuntu 16.04 LTS. See also https://strace.io/.