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diff --git a/lib/util/sig2str.c b/lib/util/sig2str.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2012-2015, 2017-2020 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#ifndef HAVE_SIG2STR
+
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include "sudo_compat.h"
+#include "sudo_util.h"
+
+#if !defined(HAVE_SIGABBREV_NP)
+# if defined(HAVE_DECL_SYS_SIGNAME) && HAVE_DECL_SYS_SIGNAME == 1
+# define sigabbrev_np(_x) sys_signame[(_x)]
+# elif defined(HAVE_DECL__SYS_SIGNAME) && HAVE_DECL__SYS_SIGNAME == 1
+# define sigabbrev_np(_x) _sys_signame[(_x)]
+# elif defined(HAVE_SYS_SIGABBREV)
+# define sigabbrev_np(_x) sys_sigabbrev[(_x)]
+# if defined(HAVE_DECL_SYS_SIGABBREV) && HAVE_DECL_SYS_SIGABBREV == 0
+ /* sys_sigabbrev is not declared by glibc */
+ extern const char *const sys_sigabbrev[NSIG];
+# endif
+# else
+# define sigabbrev_np(_x) sudo_sys_signame[(_x)]
+ extern const char *const sudo_sys_signame[NSIG];
+# endif
+#endif /* !HAVE_SIGABBREV_NP */
+
+/*
+ * Translate signal number to name.
+ */
+int
+sudo_sig2str(int signo, char *signame)
+{
+#if defined(SIGRTMIN) && defined(SIGRTMAX)
+ /* Realtime signal support. */
+ if (signo >= SIGRTMIN && signo <= SIGRTMAX) {
+# ifdef _SC_RTSIG_MAX
+ const long rtmax = sysconf(_SC_RTSIG_MAX);
+# else
+ const long rtmax = SIGRTMAX - SIGRTMIN;
+# endif
+ if (rtmax > 0) {
+ if (signo == SIGRTMIN) {
+ strlcpy(signame, "RTMIN", SIG2STR_MAX);
+ } else if (signo == SIGRTMAX) {
+ strlcpy(signame, "RTMAX", SIG2STR_MAX);
+ } else if (signo <= SIGRTMIN + (rtmax / 2) - 1) {
+ (void)snprintf(signame, SIG2STR_MAX, "RTMIN+%d",
+ (signo - SIGRTMIN));
+ } else {
+ (void)snprintf(signame, SIG2STR_MAX, "RTMAX-%d",
+ (SIGRTMAX - signo));
+ }
+ }
+ return 0;
+ }
+#endif
+ if (signo > 0 && signo < NSIG) {
+ const char *cp = sigabbrev_np(signo);
+ if (cp != NULL) {
+ strlcpy(signame, cp, SIG2STR_MAX);
+ /* Make sure we always return an upper case signame. */
+ if (islower((unsigned char)signame[0])) {
+ int i;
+ for (i = 0; signame[i] != '\0'; i++)
+ signame[i] = toupper((unsigned char)signame[i]);
+ }
+ return 0;
+ }
+ }
+ errno = EINVAL;
+ return -1;
+}
+#endif /* HAVE_SIG2STR */