syscall_table: expose get_syscall_nr without json#101
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Programmatic filter construction needs name-to-number resolution without enabling the JSON frontend. Always compile the syscall tables and export get_syscall_nr(name, arch). Add unit and integration coverage for host and cross-arch lookups. Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
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Summary
Expose architecture-specific syscall name lookup for callers that build filters in Rust without using the JSON frontend.
syscall_table(no longer gated on thejsonfeature)get_syscall_nr(name, arch) -> Option<i64>Rationale
hakoniwa could move its seccomp backend from libseccomp to seccompiler. It keeps its own filter IR and OCI/podman-style profile loader; it only needs seccompiler for name→number resolution, BPF compilation, and install.
Today the syscall tables are only linked when the
jsonfeature is enabled, so a pure library consumer cannot resolve names like"openat"without also pulling in the JSON frontend.get_syscall_nrfills that gap in the same way programmatic builders need (and matches the “skip unknown syscalls” pattern used with libseccomp’s name lookup).This is a small, self-contained slice of that work; further PRs will cover per-rule actions, optional
PR_SET_NO_NEW_PRIVS, and related install helpers.Testing