feat(resource): rlimit/rusage/priority

src/resource/getrlimit.c

@@ -0,0 +1,35 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/resource.h>
+
+#include "../internal/syscall.h"
+
+#if VLIBC_LEVEL_GE(2)
+
+/*
+ * getrlimit/getrlimit64 (todo 31).
+ *
+ * x86_64 has no getrlimit syscall; the prlimit64 ABI serves the read with
+ * (pid = 0, resource, new_limit = NULL, old_limit = &rlim). struct rlimit
+ * is two 64-bit words here — the same layout as the kernel's struct
+ * rlimit64 — so the record passes through without conversion.
+ *
+ * getrlimit64 is a name-only distinction on this architecture (rlim_t is
+ * already 64 bits); it exists as a separate exported symbol so LFS callers
+ * that reference it link cleanly.
+ */
+int
+getrlimit(int resource, struct rlimit *rlim)
+{
+    return syscall_ret(__syscall4(SYS_prlimit64, 0, (long)resource, 0, (long)rlim));
+}
+
+int
+getrlimit64(int resource, struct rlimit *rlim)
+{
+    return getrlimit(resource, rlim);
+}
+
+#endif /* VLIBC_LEVEL_GE(2) */