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Message-Id: <20160915152731.4897-1-dsabogalcc@gmail.com>
Date: Thu, 15 Sep 2016 11:27:30 -0400
From: Daniel Sabogal <dsabogalcc@...il.com>
To: musl@...ts.openwall.com
Subject: [PATCH] fix if_indextoname error case
posix requires errno to be set to ENXIO if the interface does not exist.
linux returns ENODEV instead so we handle this.
---
src/network/if_indextoname.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/network/if_indextoname.c b/src/network/if_indextoname.c
index 6ee7f13..3b368bf 100644
--- a/src/network/if_indextoname.c
+++ b/src/network/if_indextoname.c
@@ -3,6 +3,7 @@
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <string.h>
+#include <errno.h>
#include "syscall.h"
char *if_indextoname(unsigned index, char *name)
@@ -14,5 +15,9 @@ char *if_indextoname(unsigned index, char *name)
ifr.ifr_ifindex = index;
r = ioctl(fd, SIOCGIFNAME, &ifr);
__syscall(SYS_close, fd);
- return r < 0 ? 0 : strncpy(name, ifr.ifr_name, IF_NAMESIZE);
+ if (r < 0) {
+ if (errno == ENODEV) errno = ENXIO;
+ return 0;
+ }
+ return strncpy(name, ifr.ifr_name, IF_NAMESIZE);
}
--
2.10.0
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