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Test that all syscalls are available via FTRACE_SYSCALLS #146

Open mpe opened 6 years ago

mpe commented 6 years ago

As mentioned in #131 it would be nice if we had an automated test that all syscalls are available via FTRACE_SYSCALLS. Failing that we should just do it by hand.

Part of the problem is that checking against NR_syscalls doesnt' work because there are gaps in the syscall number space.

Looking at 64-bit, we currently have NR_syscalls == 387, but that's only 326 actual syscalls.

On a big endian system I see 309 in /sys/kernel/debug/tracing/events/syscalls and 311 on a little endian system.

So even if the 326 number is off by one or two, we seem to be missing quite a few.

chleroy commented 2 years ago

As far as I understand, getting syscalls for ftrace requires to use SYSCALL_DEFINE macros. We still have several syscalls which don't use that macro.