From 8bb423daf7d58af130bd1b4418bf3a08a46cb8d0 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Mon, 25 Dec 2023 15:43:56 +0200
Subject: [PATCH] LibC: Implement siginterrupt()

This is just a simple wrapper around the more-modern sigaction.
---
 Userland/Libraries/LibC/signal.cpp | 14 ++++++++++++++
 Userland/Libraries/LibC/signal.h   |  1 +
 2 files changed, 15 insertions(+)

diff --git a/Userland/Libraries/LibC/signal.cpp b/Userland/Libraries/LibC/signal.cpp
index f13e094113..e26fb5e817 100644
--- a/Userland/Libraries/LibC/signal.cpp
+++ b/Userland/Libraries/LibC/signal.cpp
@@ -102,6 +102,20 @@ int sigdelset(sigset_t* set, int sig)
     return 0;
 }
 
+// https://pubs.opengroup.org/onlinepubs/009696699/functions/siginterrupt.html
+int siginterrupt(int sig, int flag)
+{
+    struct sigaction act;
+    int rc = sigaction(sig, nullptr, &act);
+    if (rc < 0)
+        return rc;
+    if (flag)
+        act.sa_flags &= ~SA_RESTART;
+    else
+        act.sa_flags |= SA_RESTART;
+    return sigaction(sig, &act, nullptr);
+}
+
 // https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigismember.html
 int sigismember(sigset_t const* set, int sig)
 {
diff --git a/Userland/Libraries/LibC/signal.h b/Userland/Libraries/LibC/signal.h
index c3cb70a386..355d13cf54 100644
--- a/Userland/Libraries/LibC/signal.h
+++ b/Userland/Libraries/LibC/signal.h
@@ -28,6 +28,7 @@ int sigfillset(sigset_t*);
 int sigaddset(sigset_t*, int sig);
 int sigaltstack(stack_t const* ss, stack_t* old_ss);
 int sigdelset(sigset_t*, int sig);
+int siginterrupt(int sig, int flag);
 int sigismember(sigset_t const*, int sig);
 int sigprocmask(int how, sigset_t const* set, sigset_t* old_set);
 int sigpending(sigset_t*);