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Avoid long connection hang in nxlink

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This commit is contained in:
Michael Theall 2023-03-03 01:16:06 -06:00
parent ada230a882
commit 7fc278c597
1 changed files with 56 additions and 9 deletions
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65
nx/source/runtime/nxlink_stdio.c
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@ -1,22 +1,41 @@
#include "runtime/nxlink.h"
#include <string.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <string.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <unistd.h>
static int sock = -1;
int nxlinkConnectToHost(bool redirStdout, bool redirStderr)
{
int ret = -1;
if (!__nxlink_host.s_addr) {
errno = ENETUNREACH;
return -1;
}
struct sockaddr_in srv_addr;
sock = socket(AF_INET, SOCK_STREAM, 0);
if (!sock) {
return ret;
if (sock < 0) {
return -1;
}
// set to non-blocking
int flags = fcntl(sock, F_GETFL, 0);
if (flags == -1) {
close(sock);
return -1;
}
if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) != 0) {
close(sock);
return -1;
}
bzero(&srv_addr, sizeof srv_addr);
@ -24,8 +43,36 @@ int nxlinkConnectToHost(bool redirStdout, bool redirStderr)
srv_addr.sin_addr = __nxlink_host;
srv_addr.sin_port = htons(NXLINK_CLIENT_PORT);
ret = connect(sock, (struct sockaddr *) &srv_addr, sizeof(srv_addr));
if (ret != 0) {
int ret = connect(sock, (struct sockaddr *) &srv_addr, sizeof(srv_addr));
if (ret != 0 && errno != EINPROGRESS) {
int err = errno;
close(sock);
close(err);
return -1;
}
if (ret != 0) { // EINPROGRESS
struct pollfd pfd;
pfd.fd = sock;
pfd.events = POLLOUT;
pfd.revents = 0;
int n = poll(&pfd, 1, 1000); // only wait up to 1s to connect
if (n < 0) {
close(sock);
return -1;
}
if (n == 0 || !(pfd.revents & POLLOUT)) {
close(sock);
errno = ETIMEDOUT;
return -1;
}
}
// reset back to blocking
if (fcntl(sock, F_SETFL, flags & ~O_NONBLOCK) != 0) {
close(sock);
return -1;
}