feat(resource): rlimit/rusage/priority

src/resource/setrlimit.c

@@ -0,0 +1,36 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/resource.h>
+
+#include "../internal/syscall.h"
+
+#if VLIBC_LEVEL_GE(2)
+
+/*
+ * setrlimit/setrlimit64 (todo 31).
+ *
+ * The write side of the prlimit64 ABI: (pid = 0, resource,
+ * new_limit = &rlim, old_limit = NULL). struct rlimit is the kernel's
+ * struct rlimit64 layout on x86_64, so the record passes through without
+ * conversion; the kernel rejects a soft limit above the hard limit with
+ * EINVAL and a hard-limit raise without CAP_SYS_RESOURCE with EPERM.
+ *
+ * setrlimit64 is a name-only distinction on this architecture (rlim_t is
+ * already 64 bits); it exists as a separate exported symbol for LFS
+ * callers.
+ */
+int
+setrlimit(int resource, const struct rlimit *rlim)
+{
+    return syscall_ret(__syscall4(SYS_prlimit64, 0, (long)resource, (long)rlim, 0));
+}
+
+int
+setrlimit64(int resource, const struct rlimit *rlim)
+{
+    return setrlimit(resource, rlim);
+}
+
+#endif /* VLIBC_LEVEL_GE(2) */