[libc] add prctl func spec

[SchrodingerZhu]

This is needed when building scudo on aarch64.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Schrodinger ZHU Yifan (SchrodingerZhu)

Changes

This is needed when building scudo on aarch64.

---

Full diff: https://github.com/llvm/llvm-project/pull/97971.diff

1 Files Affected:

• (modified) libc/spec/linux.td (+13-1)

diff --git a/libc/spec/linux.td b/libc/spec/linux.td
index 82630ff413c73..395c2a6fe853a 100644
--- a/libc/spec/linux.td
+++ b/libc/spec/linux.td
@@ -112,7 +112,19 @@ def Linux : StandardSpec<"Linux"> {
       [], // Macros
       [], // Types
       [], // Enumerations
-      []  // Functions
+      [
+        FunctionSpec<
+          "prctl",
+          RetValSpec<IntType>,
+          [
+            ArgSpec<IntType>,
+            ArgSpec<UnsignedLongType>,
+            ArgSpec<UnsignedLongType>,
+            ArgSpec<UnsignedLongType>,
+            ArgSpec<UnsignedLongType>,
+          ]
+        >,
+      ]  // Functions
   >;
 
   HeaderSpec SysRandom = HeaderSpec<