From owner-freebsd-questions  Wed Aug 21 12:52: 9 2002
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Date: Wed, 21 Aug 2002 15:49:34 -0400 (EDT)
From: John Bleichert <syborg@stny.rr.com>
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Reply-To: John Bleichert <syborg@stny.rr.com>
To: Gianmarco Giovannelli <gmarco@giovannelli.it>
Cc: questions@FreeBSD.ORG
Subject: Re: Porting from win32 to UNIX: Sockets
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On Wed, 21 Aug 2002, Gianmarco Giovannelli wrote:

> Date: Wed, 21 Aug 2002 20:44:27 +0200
> From: Gianmarco Giovannelli <gmarco@giovannelli.it>
> To: questions@FreeBSD.ORG
> Subject: Porting from win32 to UNIX: Sockets
> 
> Hi a friend of mine involved in a porting project.
> He has asking me something about socket and more I am not able to answer  :-)
> 
> Thanks for your attention...
> 
> --- begin ---
> 
> [...]
> that are familiar with "low-level-TCP/IP" coding.
> plz help
> 
> following problem:
> I don't know how to get an errorcode in case of socket-operation failed 
> (send/recv)
> in windows it goes like this
> 
> e.g
> res = send(....);
> if (res==SOCKET_ERROR)
> {
> err = WSAGetLastError();
> if (err==....) ...;
> }
> 
> but how to do this in linux/UNIX/BSD ?
> what's the equivalent of WSAGetLastError ?
> 
> furthermore I need to know the errorcodes of
> "wouldblock" and "connreset"
> 
> 
> --- end ---
> 
> Best Regards,
> Gianmarco Giovannelli ,  "Unix expert since yesterday"

Errors are stored in the errno(3) variable. To read this, try something 
like:

 if ((br= read(s,buf,n-bcount)) > 0) {
	// do something
 } else {
	printf("error returned: %s\n", strerror(errno));
 }

check out the errno(3) and strerror(3) man pages.

JB

/* 
 * John Bleichert
 * syborg@stny.rr.com
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