From: Eugene Syromyatnikov <evgsyr@gmail.com>
Date: Sun, 7 Oct 2018 03:25:33 +0000 (+0200)
Subject: signal: return NULL if signal number has no string representation
X-Git-Tag: v4.26~39
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=2b84c24551d89df173e32dd517c2716cfcf9b5a0;p=strace

signal: return NULL if signal number has no string representation

Also return NULL if signal number is 0.

* signal.c (signame): Return NULL if signal name has not been found.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
---

diff --git a/signal.c b/signal.c
index 8dacd895..660790be 100644
--- a/signal.c
+++ b/signal.c
@@ -105,22 +105,22 @@ print_sa_handler(kernel_ulong_t handler)
 const char *
 signame(const int sig)
 {
-	static char buf[sizeof("SIGRT_%u") + sizeof(int)*3];
-
-	if (sig >= 0) {
+	if (sig > 0) {
 		const unsigned int s = sig;
 
 		if (s < nsignals)
 			return signalent[s];
 #ifdef ASM_SIGRTMAX
 		if (s >= ASM_SIGRTMIN && s <= (unsigned int) ASM_SIGRTMAX) {
+			static char buf[sizeof("SIGRT_%u") + sizeof(s) * 3];
+
 			xsprintf(buf, "SIGRT_%u", s - ASM_SIGRTMIN);
 			return buf;
 		}
 #endif
 	}
-	xsprintf(buf, "%d", sig);
-	return buf;
+
+	return NULL;
 }
 
 const char *