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.

diff --git a/src/network/if_indextoname.c b/src/network/if_indextoname.c
index 6ee7f13ce38ee10f1d32f7c9f266b9da2544beff..3b368bf0d1329be7e9844da37a3bd78eff6914b0 100644 (file)
--- 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);
 }