Hi,

I'm working on an FTPS client using the mbedtls library.
Now I'm struggling to even open the control channel, I have the following code:

if (inet_aton(host, &hisctladdr.sin_addr))
{
hisctladdr.sin_family = AF_INET;
hisctladdr.sin_port = htons(port);
strncpy(hostnamebuf, host, sizeof(hostnamebuf));
hostnamebuf[sizeof(hostnamebuf) - 1] = 0;
}
else
{
//LogPrint(ftpLogGet(), LOG_LEVEL_INFO, "Ftp::hookup IP dot format required");
iprintf("Ftp::hookup IP dot format required");
code = -1;
return (NULL);
}
hostname = hostnamebuf;
control_fd = socket(hisctladdr.sin_family, SOCK_STREAM, 0);
if (control_fd < 0)
{
//LogPrint(ftpLogGet(), 0, "Ftp::hookup socket");
iprintf("Ftp::hookup socket");
code = -1;
close(control_fd);
control_fd = -1;
return (NULL);
}

iSockFlags = fcntl(control_fd, F_GETFL, 0);
if (iSockFlags == -1) {
iprintf("Ftp::hookup : F_GETFL on %d failed, errno %d\n",control_fd,errno);
return (NULL);
}
iSockFlags |= O_NONBLOCK;
iRc = fcntl(control_fd, F_SETFL, iSockFlags);

Where the fnctl() call returns -1 and errno is set to 88. This should work, should it not?

stdcerr <ron.eggler@gmail.com> writes:
> iSockFlags = fcntl(control_fd, F_GETFL, 0);
> if (iSockFlags == -1) {
> iprintf("Ftp::hookup : F_GETFL on %d failed, errno %d\n",control_fd,errno);
> return (NULL);
> }
>
> Where the fnctl() call returns -1 and errno is set to 88. This should work, should it not?

This doesn't directly answer your question, but if you call perror()
you'll get a brief explanation of the error, which is typically more
useful than the number. I typically call it on any system call error.

FWIW, error 88 means "Socket operation on non-socket"