45 lines
1.3 KiB
Diff
45 lines
1.3 KiB
Diff
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);
|
|
}
|