strace
Troubleshooting tool for tracing system calls.
More information: https://manned.org/strace.
- Start tracing a specific [p]rocess by its PID:
strace -p pid
- Trace a [p]rocess and filt[e]r output by system call:
strace -p pid -e system_call,system_call2,...
- Count time, calls, and errors for each system call and report a summary on program exit:
strace -p pid -c
- Show the [T]ime spent in every system call:
strace -p pid -T
- Start tracing a program by executing it:
strace program
- Start tracing file operations of a program:
strace -e trace=file program
- Start tracing network operations of a program as well as all its [f]orked and child processes, saving the [o]utput to a file:
strace -f -e trace=network -o trace.txt program