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ltrace

Traces library calls made by a running program.

ltrace is the library-call analogue of strace: instead of recording system calls, it records calls into shared libraries (libc, libssl, application-specific libraries). It is useful for understanding which library functions a program invokes without having source code.

It ships in most Linux distribution repositories.

Debian/Ubuntu: sudo apt install ltrace
Fedora:        sudo dnf install ltrace
Arch:          sudo pacman -S ltrace