On 09/03/19 at 12:46, marc wrote:
>>> So you are correct that gethostid has been around for a while,
>>> but this call returns a 32bit number, typically the IP.
>> ?? No, it returns a value that's unique to the local machine even if it
>> was not configured on any network.?? Plus, the IP can change, but the
>> hostid is supposed to be static.?? The Unix hostid was developed in order
>> to uniquely identify a machine regardless of where in the Internet it
>> is.?? What you described is the gethostbyname syscall.
> Maybe your system is different to mine, but try compiling the below
> and find out for yourself:
>
> #include <stdio.h>
> #include <unistd.h>
>
> int main()
> {
> int id;
>
> id = gethostid();
>
> printf("my id is 0x%08x\n", id);
>
> return 0;
> }my id is 0x007f0101 [root@wkstn05 ~]# ifdown eth0 Killed old client process Internet Systems Consortium DHCP Client 4.4.1 Copyright 2004-2018 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Listening on LPF/eth0/00:2e:d5:f6:62:4b Sending on LPF/eth0/00:2e:d5:f6:62:4b Sending on Socket/fallback DHCPRELEASE of 192.168.0.6 on eth0 to 192.168.0.200 port 67 invoke-rc.d: policy-rc.d denied execution of reload. [root@wkstn05 ~]# my id is 0x007f0101 [root@wkstn05 ~]# ifup wlan1 Internet Systems Consortium DHCP Client 4.4.1 Copyright 2004-2018 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Listening on LPF/wlan1/1a:66:81d9:fc:30 Sending on LPF/wlan1/1a:66:81d9:fc:30 Sending on Socket/fallback Created duid "\000\001\000\001$\036kp\021\322\366\231\345M". DHCPDISCOVER on wlan1 to 255.255.255.255 port 67 interval 4 DHCPOFFER of 192.168.48.101 from 192.168.48.158 DHCPREQUEST for 192.168.48.101 on wlan1 to 255.255.255.255 port 67 DHCPACK of 192.168.48.101 from 192.168.48.158 invoke-rc.d: policy-rc.d denied execution of reload. bound to 192.168.48.101 -- renewal in 1626 seconds. invoke-rc.d: policy-rc.d denied execution of alarm. [root@wkstn05 ~]# my id is 0x007f0101 So what? Can't you read man gethostid(3)? -- Alessandro Selli <alessandrose...@linux.com> VOIP SIP: dhatarat...@ekiga.net Chiave firma e cifratura PGP/GPG signing and encoding key: BA651E4050DDFC31E17384BABCE7BD1A1B0DF2AE
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