From 1a124e61f3a0975975fe618be0f254246c92c63a Mon Sep 17 00:00:00 2001
From: Michalis Pappas <michalis@unikraft.io>
Date: Mon, 24 Mar 2025 06:11:27 +0100
Subject: [PATCH] lib/posix-process/signals: Add libc wrappers for POSIX
 sigsetops

Add libc wrappers for signal set operations. For more info
see sigsetops(3).

Signed-off-by: Michalis Pappas <michalis@unikraft.io>
Reviewed-by: Ioan-Teodor Teugea <ioan_teodor.teugea@stud.acs.upb.ro>
Reviewed-by: Sergiu Moga <sergiu@unikraft.io>
Reviewed-by: Andrei Tatar <andrei@unikraft.io>
Approved-by: Andrei Tatar <andrei@unikraft.io>
GitHub-Closes: #1248
---
 lib/posix-process/Makefile.uk     |  1 +
 lib/posix-process/exportsyms.uk   |  5 +++
 lib/posix-process/signal/sigset.c | 56 +++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+)
 create mode 100644 lib/posix-process/signal/sigset.c

diff --git a/lib/posix-process/Makefile.uk b/lib/posix-process/Makefile.uk
index 8bcc64501..1d5b7e00d 100644
--- a/lib/posix-process/Makefile.uk
+++ b/lib/posix-process/Makefile.uk
@@ -19,6 +19,7 @@ LIBPOSIX_PROCESS_SRCS-y += $(LIBPOSIX_PROCESS_BASE)/process.c
 LIBPOSIX_PROCESS_SRCS-y += $(LIBPOSIX_PROCESS_BASE)/wait.c
 
 LIBPOSIX_PROCESS_SRCS-$(CONFIG_LIBPOSIX_PROCESS_SIGNAL) += $(LIBPOSIX_PROCESS_BASE)/signal/signal.c
+LIBPOSIX_PROCESS_SRCS-$(CONFIG_LIBPOSIX_PROCESS_SIGNAL) += $(LIBPOSIX_PROCESS_BASE)/signal/sigset.c
 LIBPOSIX_PROCESS_SRCS-$(CONFIG_LIBPOSIX_PROCESS_SIGNAL) += $(LIBPOSIX_PROCESS_BASE)/arch/$(CONFIG_UK_ARCH)/ucontext.c
 LIBPOSIX_PROCESS_SRCS-$(CONFIG_LIBPOSIX_PROCESS_SIGNAL) += $(LIBPOSIX_PROCESS_BASE)/arch/$(CONFIG_UK_ARCH)/signal.S|arch
 LIBPOSIX_PROCESS_SRCS-$(CONFIG_LIBPOSIX_PROCESS_SIGNAL) += $(LIBPOSIX_PROCESS_BASE)/signal/deliver.c
diff --git a/lib/posix-process/exportsyms.uk b/lib/posix-process/exportsyms.uk
index f235a2983..56ec39f69 100644
--- a/lib/posix-process/exportsyms.uk
+++ b/lib/posix-process/exportsyms.uk
@@ -45,6 +45,11 @@ clone
 vfork
 kill
 pause
+sigaddset
 sigaltstack
+sigdelset
+sigemptyset
+sigfillset
+sigismember
 sigprocmask
 tgkill
diff --git a/lib/posix-process/signal/sigset.c b/lib/posix-process/signal/sigset.c
new file mode 100644
index 000000000..f3b0463a6
--- /dev/null
+++ b/lib/posix-process/signal/sigset.c
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2023, Unikraft GmbH and The Unikraft Authors.
+ * Licensed under the BSD-3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ */
+
+#include <errno.h>
+#include <signal.h>
+
+#include <uk/arch/lcpu.h> /* unlikely */
+
+#include "sigset.h"
+
+#if !HAVE_LIBC
+int sigaddset(sigset_t *set, int signo)
+{
+	if (unlikely(signo <= 0 || signo >= NSIG)) {
+		errno = EINVAL;
+		return -1;
+	}
+	uk_sigaddset(set, signo);
+	return 0;
+}
+
+int sigdelset(sigset_t *set, int signo)
+{
+	if (unlikely(signo <= 0 || signo >= NSIG)) {
+		errno = EINVAL;
+		return -1;
+	}
+	uk_sigdelset(set, signo);
+	return 0;
+}
+
+int sigemptyset(sigset_t *set)
+{
+	uk_sigemptyset(set);
+	return 0;
+}
+
+int sigfillset(sigset_t *set)
+{
+	uk_sigfillset(set);
+	return 0;
+}
+
+int sigismember(const sigset_t *set, int signo)
+{
+	if (unlikely(signo <= 0 || signo >= NSIG)) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	return uk_sigismember(set, signo);
+}
+#endif /* !HAVE_LIBC */
-- 
2.39.5