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Add support for socket send/receive timeouts.

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Only the receive timeout is hooked up yet. You can change the timeout by
calling setsockopt(..., SOL_SOCKET, SO_RCVTIMEO, ...).

Use this mechanism to make /bin/ping report timeouts.
This commit is contained in:
Andreas Kling 2019-03-13 13:13:23 +01:00
parent 7bcd386338
commit 562663df7c
12 changed files with 212 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

20
Userland/ping.cpp
View file

@ -39,6 +39,13 @@ int main(int argc, char** argv)
return 1;
}
struct timeval timeout { 1, 0 };
int rc = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
if (rc < 0) {
perror("setsockopt");
return 1;
}
const char* addr_str = "192.168.5.1";
if (argc > 1)
addr_str = argv[1];
@ -50,7 +57,7 @@ int main(int argc, char** argv)
peer_address.sin_family = AF_INET;
peer_address.sin_port = 0;
int rc = inet_pton(AF_INET, addr_str, &peer_address.sin_addr);
rc = inet_pton(AF_INET, addr_str, &peer_address.sin_addr);
struct PingPacket {
struct icmphdr header;
@ -84,6 +91,10 @@ int main(int argc, char** argv)
for (;;) {
rc = recvfrom(fd, &pong_packet, sizeof(PingPacket), 0, (const struct sockaddr*)&peer_address, sizeof(sockaddr_in));
if (rc < 0) {
if (errno == EAGAIN) {
printf("Request (seq=%u) timed out.\n", ntohs(ping_packet.header.un.echo.sequence));
break;
}
perror("recvfrom");
return 1;
}
@ -104,12 +115,17 @@ int main(int argc, char** argv)
int ms = tv_diff.tv_sec * 1000 + tv_diff.tv_usec / 1000;
char addr_buf[64];
printf("Pong from %s: id=%u, seq=%u, time=%dms\n",
printf("Pong from %s: id=%u, seq=%u%s, time=%dms\n",
inet_ntop(AF_INET, &peer_address.sin_addr, addr_buf, sizeof(addr_buf)),
ntohs(pong_packet.header.un.echo.id),
ntohs(pong_packet.header.un.echo.sequence),
pong_packet.header.un.echo.sequence != ping_packet.header.un.echo.sequence ? "(!)" : "",
ms
);
// If this was a response to an earlier packet, we still need to wait for the current one.
if (pong_packet.header.un.echo.sequence != ping_packet.header.un.echo.sequence)
continue;
break;
}