diff options
| -rw-r--r-- | system-linux.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/system-linux.c b/system-linux.c index 9933201..0b594f6 100644 --- a/system-linux.c +++ b/system-linux.c @@ -781,7 +781,9 @@ static int system_if_flags(const char *ifname, unsigned add, unsigned rem) memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); - ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr); + if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) < 0) + return -1; + ifr.ifr_flags |= add; ifr.ifr_flags &= ~rem; return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr); |