diff --git a/include/zephyr/posix/signal.h b/include/zephyr/posix/signal.h
index 165050f2ded9..7a1efdbd449c 100644
--- a/include/zephyr/posix/signal.h
+++ b/include/zephyr/posix/signal.h
@@ -77,6 +77,16 @@ typedef struct {
 #define SIG_UNBLOCK 2
 #endif
 
+#define SIG_DFL ((void *)0)
+#define SIG_IGN ((void *)1)
+#define SIG_ERR ((void *)-1)
+
+#define SI_USER 1
+#define SI_QUEUE 2
+#define SI_TIMER 3
+#define SI_ASYNCIO 4
+#define SI_MESGQ 5
+
 typedef int	sig_atomic_t;		/* Atomic entity type (ANSI) */
 
 union sigval {
@@ -92,12 +102,34 @@ struct sigevent {
 	int sigev_signo;
 };
 
+typedef struct {
+	int si_signo;
+	int si_code;
+	union sigval si_value;
+} siginfo_t;
+
+struct sigaction {
+	void (*sa_handler)(int signno);
+	sigset_t sa_mask;
+	int sa_flags;
+	void (*sa_sigaction)(int signo, siginfo_t *info, void *context);
+};
+
+unsigned int alarm(unsigned int seconds);
+int kill(pid_t pid, int sig);
+int pause(void);
+int raise(int signo);
+int sigaction(int sig, const struct sigaction *ZRESTRICT act, struct sigaction *ZRESTRICT oact);
+int sigpending(sigset_t *set);
+int sigsuspend(const sigset_t *sigmask);
+int sigwait(const sigset_t *ZRESTRICT set, int *ZRESTRICT signo);
 char *strsignal(int signum);
 int sigemptyset(sigset_t *set);
 int sigfillset(sigset_t *set);
 int sigaddset(sigset_t *set, int signo);
 int sigdelset(sigset_t *set, int signo);
 int sigismember(const sigset_t *set, int signo);
+void (*signal(int signo, void (*)(int signo)))(int signo);
 int sigprocmask(int how, const sigset_t *ZRESTRICT set, sigset_t *ZRESTRICT oset);
 
 int pthread_sigmask(int how, const sigset_t *ZRESTRICT set, sigset_t *ZRESTRICT oset);
diff --git a/lib/libc/Kconfig b/lib/libc/Kconfig
index 6607f62c521f..7a509fb06e59 100644
--- a/lib/libc/Kconfig
+++ b/lib/libc/Kconfig
@@ -105,6 +105,7 @@ config NEWLIB_LIBC
 	imply POSIX_FD_MGMT_ALIAS_LSEEK
 	imply POSIX_FILE_SYSTEM_ALIAS_FSTAT
 	imply POSIX_MULTI_PROCESS_ALIAS_GETPID
+	imply POSIX_SIGNALS_ALIAS_KILL
 	help
 	  Build with newlib library. The newlib library is expected to be
 	  part of the SDK in this case.
diff --git a/lib/posix/options/Kconfig.signal b/lib/posix/options/Kconfig.signal
index 4507302e3f32..1e84a55de598 100644
--- a/lib/posix/options/Kconfig.signal
+++ b/lib/posix/options/Kconfig.signal
@@ -24,6 +24,7 @@ endif # POSIX_REALTIME_SIGNALS
 config POSIX_SIGNALS
 	bool "POSIX signals [EXPERIMENTAL]"
 	select EXPERIMENTAL
+	select POSIX_MULTI_PROCESS
 	help
 	  Enable support for POSIX signals.
 
@@ -36,6 +37,12 @@ config POSIX_SIGNAL_STRING_DESC
 	  Use full description for the strsignal API.
 	  Will use 256 bytes of ROM.
 
+# These options are intended to be used for compatibility with external POSIX
+# implementations such as those in Newlib or Picolibc.
+
+config POSIX_SIGNALS_ALIAS_KILL
+	bool
+
 endif
 
 endmenu # "Signal support"
diff --git a/lib/posix/options/signal.c b/lib/posix/options/signal.c
index cb282f69bdc8..84171fde0f07 100644
--- a/lib/posix/options/signal.c
+++ b/lib/posix/options/signal.c
@@ -118,3 +118,62 @@ int sigprocmask(int how, const sigset_t *ZRESTRICT set, sigset_t *ZRESTRICT oset
 	errno = ENOSYS;
 	return -1;
 }
+
+/*
+ * The functions below are provided so that conformant POSIX applications and libraries can still
+ * link.
+ */
+
+unsigned int alarm(unsigned int seconds)
+{
+	ARG_UNUSED(seconds);
+	return 0;
+}
+
+int kill(pid_t pid, int sig)
+{
+	ARG_UNUSED(pid);
+	ARG_UNUSED(sig);
+	errno = ENOSYS;
+	return -1;
+}
+#ifdef CONFIG_POSIX_SIGNALS_ALIAS_KILL
+FUNC_ALIAS(kill, _kill, int);
+#endif /* CONFIG_POSIX_SIGNALS_ALIAS_KILL */
+
+int pause(void)
+{
+	errno = ENOSYS;
+	return -1;
+}
+
+int sigaction(int sig, const struct sigaction *ZRESTRICT act, struct sigaction *ZRESTRICT oact)
+{
+	ARG_UNUSED(sig);
+	ARG_UNUSED(act);
+	ARG_UNUSED(oact);
+	errno = ENOSYS;
+	return -1;
+}
+
+int sigpending(sigset_t *set)
+{
+	ARG_UNUSED(set);
+	errno = ENOSYS;
+	return -1;
+}
+
+int sigsuspend(const sigset_t *sigmask)
+{
+	ARG_UNUSED(sigmask);
+	errno = ENOSYS;
+	return -1;
+}
+
+int sigwait(const sigset_t *ZRESTRICT set, int *ZRESTRICT sig)
+{
+	ARG_UNUSED(set);
+	ARG_UNUSED(sig);
+	errno = ENOSYS;
+	return -1;
+}