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.

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 ...

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 ...

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.

Mar 17, 2022 · strace: I recommend the use of strace. Unlike lsof, it stays running for as long as the process is running. It will print out which syscalls are being called when they are called. -e trace=file filters only for syscalls that access the filesystem: sudo strace -f -t -e trace=file php foo.php or for an already running process :

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 …

Apr 8, 2013 · Strace. Records/intercepts system calls which are called/received by a process. Ltrace. Records/intercepts signals/dynamic library/system calls which are called/received by a process. Apport. Intercepts crashes/unhandled exceptions, collects OS information, presents a helpful UI, and is able to file non-crash bugs.

May 29, 2014 · For example, in Linux, strace (which is implemented with the ptrace system call) can inspect the system calls invoked by the child process. When the attached child process invokes a system call, the ptracing parent process can be notified. But how exactly does that happen? I want to know the technical details behind this mechanism. Thank you in ...

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