diff options
Diffstat (limited to 'networking/udhcp/arpping.c')
| -rw-r--r-- | networking/udhcp/arpping.c | 29 |
1 files changed, 13 insertions, 16 deletions
diff --git a/networking/udhcp/arpping.c b/networking/udhcp/arpping.c index 4ac52c6..3351807 100644 --- a/networking/udhcp/arpping.c +++ b/networking/udhcp/arpping.c @@ -37,14 +37,12 @@ struct arpMsg { int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *interface) { - int timeout = 2; - int s; /* socket */ + int timeout_ms = 2000; + struct pollfd pfd[1]; +#define s (pfd[0].fd) /* socket */ int rv = 1; /* "no reply received" yet */ struct sockaddr addr; /* for interface name */ struct arpMsg arp; - fd_set fdset; - struct timeval tm; - unsigned prevTime; s = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ARP)); if (s == -1) { @@ -80,18 +78,17 @@ int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *i /* wait for arp reply, and check it */ do { int r; - prevTime = monotonic_sec(); - FD_ZERO(&fdset); - FD_SET(s, &fdset); - tm.tv_sec = timeout; - tm.tv_usec = 0; - r = select(s + 1, &fdset, NULL, NULL, &tm); + unsigned prevTime = monotonic_us(); + + pfd[0].events = POLLIN; + r = poll(pfd, 1, timeout_ms); if (r < 0) { - bb_perror_msg("error on ARPING request"); - if (errno != EINTR) + if (errno != EINTR) { + bb_perror_msg("poll"); break; + } } else if (r) { - if (recv(s, &arp, sizeof(arp), 0) < 0) + if (read(s, &arp, sizeof(arp)) < 0) break; if (arp.operation == htons(ARPOP_REPLY) && memcmp(arp.tHaddr, from_mac, 6) == 0 @@ -101,8 +98,8 @@ int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *i break; } } - timeout -= monotonic_sec() - prevTime; - } while (timeout > 0); + timeout_ms -= (monotonic_us() - prevTime) / 1000; + } while (timeout_ms > 0); ret: close(s); |