strace
SafeTrace system calls
strace -p <pid>
Traces syscalls — the trump card for 'which file open failed' style mysteries.
Examples
strace -e trace=open,openat -f ./app 2>&1 | grep ENOENTFind missing files
Syntax
strace [-p pid] [-e trace=set] <cmd>
Before you run it
Slows the target; keep it brief in prod.
Related commands
- lsofOpen files/ports
- journalctlsystemd logs
The same reference, with no signal at all
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