ktrace is also used on OpenBSD. Check for it on other BSD platforms if you happen to be use one.

Solaris 10 has a new tool called dtrace but as far as I know truss still works.

Update: You might also be able to use a debugger like gdb but I would use one of the tracing tools.

In reply to Re^2: (OT) Logging open calls from a C program (system call tracing tools) by superfrink
in thread (OT) Logging open calls from a C program by Anonymous Monk

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