1 files changed, 44 insertions, 0 deletions

diff --git a/meta/recipes-extended/iputils/files/arping-fix-arping-hang-if-SIGALRM-is-blocked.patch b/meta/recipes-extended/iputils/files/arping-fix-arping-hang-if-SIGALRM-is-blocked.patch
new file mode 100644
index 0000000000..7b56276b39
--- /dev/null
+++ b/meta/recipes-extended/iputils/files/arping-fix-arping-hang-if-SIGALRM-is-blocked.patch
@@ -0,0 +1,44 @@
+arping: fix arping hang if SIGALRM is blocked
+
+Unblock SIGALRM so that the previously called alarm() can prevent
+recvfrom() from blocking forever in case the inherited procmask is
+blocking SIGALRM and no packet is received.
+
+Upstream-Status: Backport
+
+Reported-by: Rui Prior <rprior@dcc.fc.up.pt>
+RH-Bugzilla: #1085971
+Signed-off-by: Jan Synacek <jsynacek@redhat.com>
+Signed-off-by: Zhenbo Gao <zhenbo.gao@windriver.com>
+
+diff --git a/arping.c.orig b/arping.c
+index 35408c1..2098159 100644
+--- a/arping.c.orig
++++ b/arping.c
+@@ -1215,16 +1215,22 @@ main(int argc, char **argv)
+                socklen_t alen = sizeof(from);
+                int cc;
+ 
++               sigemptyset(&sset);
++               sigaddset(&sset, SIGALRM);
++               sigaddset(&sset, SIGINT);
++               /* Unblock SIGALRM so that the previously called alarm()
++                * can prevent recvfrom from blocking forever in case the
++                * inherited procmask is blocking SIGALRM and no packet
++                * is received. */
++               sigprocmask(SIG_UNBLOCK, &sset, &osset);
++
+                if ((cc = recvfrom(s, packet, sizeof(packet), 0,
+                                   (struct sockaddr *)&from, &alen)) < 0) {
+                        perror("arping: recvfrom");
+                        continue;
+                }
+ 
+-               sigemptyset(&sset);
+-               sigaddset(&sset, SIGALRM);
+-               sigaddset(&sset, SIGINT);
+-               sigprocmask(SIG_BLOCK, &sset, &osset);
++               sigprocmask(SIG_BLOCK, &sset, NULL);
+                recv_pack(packet, cc, (struct sockaddr_ll *)&from);
+                sigprocmask(SIG_SETMASK, &osset, NULL);
+        }