This ledger is the authoritative inventory for the Cross-Layer Interface Maps . Rows are seeded from the
wave-2 mapping chapters; the Status column is merged from agent status
reports. Vocabulary: not-started | researched | documented | source-limited.
ID Map Status Chapter Notes
XR-001 printf family -> write/writev -> vfs_write (stdio buffering path) documented libc-syscall-kernel — XR-002 fopen/fread family -> open/read -> VFS/page cache documented libc-syscall-kernel — XR-003 malloc -> brk/mmap -> mm allocator path (arena model, non-1:1) documented libc-syscall-kernel — XR-004 posix_spawn -> clone+execve composite (action list, non-1:1) documented libc-syscall-kernel — XR-005 pthread_create -> clone(CLONE_VM CLONE_THREAD) -> scheduler documented libc-syscall-kernel XR-006 pthread_mutex_lock -> futex -> futex wait queue documented libc-syscall-kernel — XR-007 readdir(3) -> getdents64 -> fs/readdir.c documented libc-syscall-kernel — XR-008 exec family -> execve/execveat -> fs/exec.c (binfmt) documented libc-syscall-kernel — XR-009 signal functions -> rt_sig* family -> kernel/signal.c documented libc-syscall-kernel — XR-010 clock_gettime/gettimeofday -> vDSO/clock_gettime64 -> timekeeping documented libc-syscall-kernel — XR-011 socket/connect/send -> socket family -> net/socket.c documented libc-syscall-kernel — XR-012 getpwnam/NSS -> no direct syscall -> /etc/passwd + NSS modules (musl: built-in) documented libc-syscall-kernel glibc nss.texi module interface + host /etc/nsswitch.conf; musl src/passwd/getpw_a.c; libnss_files.so.2 is a stub (files service in libc 2.41) XR-013 ioctl -> fs/ioctl dispatch -> driver unlocked_ioctl (tty: tty_ioctl chain) documented libc-syscall-kernel tty path via fetched drivers/tty/tty_io.c + cached ioctl_tty.2; termios-answer site (tty_ioctl.c) below cached sources XR-014 dynamic loader -> mmap/open/read -> ld.so program loading documented libc-syscall-kernel —
ID Map Status Chapter Notes
XR-101 /sys/class/block + bdi -> block core -> genhd/blk-sysfs -> lsblk, blockdev documented sysfs-driver-tools — XR-102 /sys/class/net -> net core -> net-sysfs -> ip, ethtool, NetworkManager documented sysfs-driver-tools NetworkManager(8) 1.52.1 (manpages.debian.org): udev discovery, NM_UNMANAGED/ID_NET_MANAGED_BY XR-103 /sys/class/tty -> tty core -> tty_io -> stty, agetty, udev documented sysfs-driver-tools — XR-104 /sys/class/nvme -> nvme host core -> nvme-cli, libnvme documented sysfs-driver-tools — XR-105 /sys/class/hwmon -> hwmon core -> sensors (lm-sensors) documented sysfs-driver-tools — XR-106 /sys/class/thermal -> thermal core -> thermald documented sysfs-driver-tools thermald(8) 2.5.9 (manpages.debian.org): scans /sys/class/thermal for sensors and cooling drivers XR-107 /sys/class/power_supply -> power supply core -> UPower documented sysfs-driver-tools UPower ref manual v1.91.2 (upower.freedesktop.org): NativePath = sysfs power_supply path XR-108 /sys/class/leds + backlight -> leds/backlight cores -> brightnessctl, systemd-backlight documented sysfs-driver-tools — XR-109 /sys/class/{gpio,pwm,regulator,i2c-adapter} -> subsystem cores -> libgpiod, pinctrl tools documented sysfs-driver-tools — XR-110 /sys/class/input -> input core -> libinput/evdev documented sysfs-driver-tools libinput 1.31.0 docs (wayland.freedesktop.org): ID_INPUT_* udev-property contract XR-111 /sys/class/drm + graphics -> DRM core -> libdrm/compositors documented sysfs-driver-tools drm(7) + libdrm 2.4.124 man pages (manpages.debian.org): ioctl wrappers over /dev/dri/card0 XR-112 /sys/class/{msr,cpuid} -> x86 arch code -> msr-tools source-limited sysfs-driver-tools msr-tools rdmsr/wrmsr docs unreachable (kernel.org anti-bot); cpuid(1) + msr(4) halves sourced XR-113 /sys/class/infiniband + devlink + dax -> RDMA/devlink/dax cores -> rdma, ndctl documented sysfs-driver-tools rdma-core README (github.com/linux-rdma/rdma-core): uverbsX/rdma_cm/umadX nodes; ndctl README: libnvdimm scope XR-114 non-class trees (/sys/devices, /sys/bus, /sys/module, /sys/kernel, /sys/fs) -> sysctl, dmidecode documented sysfs-driver-tools sysctl(8) procps 4.0.4 (/proc/sys) + dmidecode(8) 3.6 (sysfs DMI FILES) fetched
ID Map Status Chapter Notes
XR-201 io_uring (5.1/5.5+) -> liburing, no glibc wrapper -> kernel config + caps documented feature-matrix — XR-202 pidfd API (5.3+) -> glibc 2.30+ wrappers -> kernel config documented feature-matrix — XR-203 openat2/resize/landlock (5.6/5.13) -> no glibc wrapper era -> headers/libseccomp era documented feature-matrix — XR-204 clone3 + struct sizzie (5.3+) -> glibc 2.34+ posix_spawn routing -> fallback story documented feature-matrix — XR-205 time64 (5.1, 32-bit) -> glibc 2.30/2.32/2.34 stages -> runtime fallback documented feature-matrix — XR-206 statx (4.11) -> glibc statx wrapper 2.28 -> header gates documented feature-matrix — XR-207 mount API (5.2+) fsopen/move_mount -> no glibc wrapper -> libmount documented feature-matrix — XR-208 memfd_secret (5.14) -> no glibc wrapper -> SECRETMEM config documented feature-matrix full syscall page + header sweep; secretmem.enable v6.4/v6.5 flip stays tag-bisect sourced XR-209 cachestat (6.5) -> no glibc wrapper -> structs in linux/mman.h, raw syscall() documented feature-matrix no linux/cachestat.h on host; structs ship in linux/mman.h (linux-libc-dev) XR-210 fchmodat2 (6.6) -> glibc 2.40 fchmodat routing -> runtime prereq documented feature-matrix —
Total rows: 38. Statuses: not-started=0, researched=0, source-limited=1, documented=37.