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List:       mingw-users
Subject:    RE: [Mingw-users] [mingw - C/C++] gethostname() is failing
From:       "WELLS, ROGER K." <ROGER.K.WELLS () saic ! com>
Date:       2005-11-21 16:37:10
Message-ID: DE31A43DBCABD64A9397DDFD45B89220DBA6CF () 0015-its-exmb01 ! us ! saic ! com
[Download RAW message or body]

I think that the error is just telling you that you haven't allocated any
memory to hold the name.  In any case you have allocate storage for the
hostname:

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>

#define MAX_HOST_LEN   512

int main()
{
    int counter = 2;
    char hostname[MAX_HOST_LEN];
    WORD wVersionRequested;
    WSADATA wsaData;

    wVersionRequested = MAKEWORD(1, 1);
    if (WSAStartup(wVersionRequested,&wsaData)) 
    {
        printf("\nWSAStartup() failed");
        exit(1);
    }

    counter = gethostname(hostname, MAX_HOST_LEN);
    printf("Details: %d, %s\n", counter, hostname);

    return 0;
}

This gives: Details: 0, rwells-w2k
On my system: WinXP SP2, GCC 3.4.4

Roger Wells, P.E.
SAIC
221 Third St
Newport, RI 02840
401-847-4210 (voice)
401-849-1585 (fax)
roger.k.wells@saic.com

-----Original Message-----
From: mingw-users-admin@lists.sourceforge.net
[mailto:mingw-users-admin@lists.sourceforge.net] On Behalf Of
SourceForge.net
Sent: Monday, November 21, 2005 10:56 AM
To: noreply@sourceforge.net
Subject: [Mingw-users] [mingw - C/C++] gethostname() is failing


Read and respond to this message at: 
https://sourceforge.net/forum/message.php?msg_id=3436821
By: db_parida

Hi All,

I am stuck at a place when the gethostname() function is failing even if I
have
loaded the library.

See the code below. The result ('counter')is always -1. Please help me...

Code:
-------------
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>

#define MAX_HOST_LEN   512

int main()
{
        int counter=2;
		char *hostname;
		WORD wVersionRequested;
      	WSADATA wsaData;
 
      	wVersionRequested = MAKEWORD(1, 1);
	if (WSAStartup(0x0101,&wsaData)) 
    {
        printf("\nWSAStartup() failed");
		exit(1);
	}
 
		counter=gethostname(hostname, MAX_HOST_LEN);
		printf("Details: %d",counter);

        return 0;
}



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