Re: [9fans] Plan9ports lib9p question: serving to a plain 'ol tcp socket

[Russ Cox <russcox@gmail.com>]

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Attached is a replacement for /usr/local/plan9/src/lib9/post9p.c
(note that it says /lib9/ not /lib9p/!).  If you put that in, then you
should be able to just call threadpostmountsrv with a service 
of 'tcp!*!12345' or whatever you want. 

If you do this, then the service loop will be single-threaded
(as lib9p service loops always are) and the library will handle
feeding it messages from potentially many different active
connections.

Russ

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from postmaster@ethel:
The following attachment had content that we can't
prove to be harmless.  To avoid possible automatic
execution, we changed the content headers.
The original header was:

	Content-Type: text/x-csrc; name="post9p.c"
	Content-Transfer-Encoding: base64
	Content-Disposition: attachment; filename="post9p.c"

[-- Attachment #2.2: post9p.c.suspect --]
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#include <u.h>
#include <libc.h>

int
post9pservice(int fd, char *name)
{
	int i;
	char *ns, *s;
	Waitmsg *w;

	if(strchr(name, '!'))	/* assume is already network address */
		s = strdup(name);
	else{
		if((ns = getns()) == nil)
			return -1;
		s = smprint("unix!%s/%s", ns, name);
		free(ns);
	}
	if(s == nil)
		return -1;
	switch(fork()){
	case -1:
		return -1;
	case 0:
		dup(fd, 0);
		dup(fd, 1);
		for(i=3; i<20; i++)
			close(i);
		execlp("9pserve", "9pserve", "-u", s, (char*)0);
		fprint(2, "exec 9pserve: %r\n");
		_exits("exec");
	default:
		w = wait();
		if(w == nil)
			return -1;
		close(fd);
		free(s);
		if(w->msg && w->msg[0]){
			free(w);
			werrstr("9pserve failed");
			return -1;
		}
		free(w);
		return 0;
	}
}