[PATCH] fix if_indextoname error case

[Daniel Sabogal <dsabogalcc@gmail.com>]

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