[libc][wait] add comment about __W_CONTINUED value

[nickdesaulniers]

No description provided.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Nick Desaulniers (nickdesaulniers)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/125934.diff

1 Files Affected:

• (modified) libc/src/sys/wait/wait4Impl.h (+2)

diff --git a/libc/src/sys/wait/wait4Impl.h b/libc/src/sys/wait/wait4Impl.h
index ec84eee491de24..f2bdeb02f8668d 100644
--- a/libc/src/sys/wait/wait4Impl.h
+++ b/libc/src/sys/wait/wait4Impl.h
@@ -65,6 +65,8 @@ LIBC_INLINE ErrorOr<pid_t> wait4impl(pid_t pid, int *wait_status, int options,
       *wait_status = W_STOPCODE(info.si_status);
       break;
     case CLD_CONTINUED:
+      // Set wait_status to a value that the caller can check via WIFCONTINUED.
+      // glibc has a non-POSIX macro definition __W_CONTINUED for this value.
       *wait_status = 0xffff;
       break;
     default: