fix if_nametoindex return value when socket open fails

The return value of if_nametoindex is unsigned; it should return 0
on error.

diff --git a/src/network/if_nametoindex.c b/src/network/if_nametoindex.c
index cb6ec05..331413c 100644 (file)
--- a/src/network/if_nametoindex.c
+++ b/src/network/if_nametoindex.c
@@ -10,7 +10,7 @@ unsigned if_nametoindex(const char *name)
        struct ifreq ifr;
        int fd, r;
 
-       if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return -1;
+       if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
        strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
        r = ioctl(fd, SIOCGIFINDEX, &ifr);
        __syscall(SYS_close, fd);