From 7caababf8dd880a0c9968ed1d18e5dcf2f652839 Mon Sep 17 00:00:00 2001
From: Chen Chengjun <chenchengjun.ccj@antgroup.com>
Date: Tue, 16 Dec 2025 02:31:48 +0000
Subject: [PATCH] Add SCML for waitid syscall

---
 book/src/kernel/linux-compatibility/README.md      |  2 +-
 .../process-and-thread-management/README.md        | 14 ++++++++++++++
 .../process-and-thread-management/waitid.scml      |  7 +++++++
 3 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 book/src/kernel/linux-compatibility/syscall-flag-coverage/process-and-thread-management/waitid.scml

diff --git a/book/src/kernel/linux-compatibility/README.md b/book/src/kernel/linux-compatibility/README.md
index 3b1b9c519..8329bb0fa 100644
--- a/book/src/kernel/linux-compatibility/README.md
+++ b/book/src/kernel/linux-compatibility/README.md
@@ -267,7 +267,7 @@ which are summarized in the table below.
 | 244     | mq_notify              | ❌             | N/A |
 | 245     | mq_getsetattr          | ❌             | N/A |
 | 246     | kexec_load             | ❌             | N/A |
-| 247     | waitid                 | ✅             | ❓ |
+| 247     | waitid                 | ✅             | [⚠️](syscall-flag-coverage/process-and-thread-management/#waitid) |
 | 248     | add_key                | ❌             | N/A |
 | 249     | request_key            | ❌             | N/A |
 | 250     | keyctl                 | ❌             | N/A |
diff --git a/book/src/kernel/linux-compatibility/syscall-flag-coverage/process-and-thread-management/README.md b/book/src/kernel/linux-compatibility/syscall-flag-coverage/process-and-thread-management/README.md
index 95d76f07c..c048c93a8 100644
--- a/book/src/kernel/linux-compatibility/syscall-flag-coverage/process-and-thread-management/README.md
+++ b/book/src/kernel/linux-compatibility/syscall-flag-coverage/process-and-thread-management/README.md
@@ -66,3 +66,17 @@ Unsupported policies or flags:
 
 For more information,
 see [the man page](https://man7.org/linux/man-pages/man2/sched_setscheduler.2.html).
+
+### `waitid`
+
+Supported functionality in SCML:
+
+```c
+{{#include waitid.scml}}
+```
+
+Ignored options:
+* `WEXITED`
+
+For more information,
+see [the man page](https://man7.org/linux/man-pages/man2/waitid.2.html).
\ No newline at end of file
diff --git a/book/src/kernel/linux-compatibility/syscall-flag-coverage/process-and-thread-management/waitid.scml b/book/src/kernel/linux-compatibility/syscall-flag-coverage/process-and-thread-management/waitid.scml
new file mode 100644
index 000000000..ba194938f
--- /dev/null
+++ b/book/src/kernel/linux-compatibility/syscall-flag-coverage/process-and-thread-management/waitid.scml
@@ -0,0 +1,7 @@
+// Wait for a child process to change state
+waitid(
+    which = P_PID | P_PIDFD | P_PGID | P_ALL,
+    pid, infop,
+    options = WNOHANG | WSTOPPED | WCONTINUED | WNOWAIT,
+    ru
+);