Porting linux pthread app 2 FreeBSD-4.2

Typedef

Hmmmmm what is the story with this?
Seems as if simple threading against -lc_r works ok in FreeBSD-4.2 but in certain situations there is some weirdness with __pthread_connect? What the fsck? How come I could compile something simple like code in this post against -lc_r and not get strange references to __pthread_connect? Has anyone come across this problem or know the fix?


/*Please disregard php tag ok?*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <pthread.h>

typedef struct node{
int scaned;
struct node*next;
}node_t;
/*if we keep scanned ports in a linked list then maybe we can avoid constraints of arrays on number of ports to
that we can scan or sumthin ?*/

int makesock(int scanthis);
void ifjoin(int successport);
int makenode(int port);
int scannode(int port);
void delnode(void);
void ctrl_c(int signal);

pthread_t threads;
node_t*head;
char*ipaddress;
void*retval;

int main(int argc, char*argv[])
{
int scanthis;
int highport,lowport,ipaddr,ctrl,x,e,f;
int done=0;
int true=1;
if(argc<3)
{printf("\nUsage skim [ipaddress] [lowport] [highport] [timeout]\n");
printf("If you want to omit timeout for default 5 seconds umkay?\n\n\n");
return -1;};

ipaddress=argv[1];
lowport=atoi(argv[2]);
highport=atoi(argv[3]);
if(argv[4]){
f=atoi(argv[4]);
if(f<=0)
{f=5;};
}
else{f=5;};/*if user wants to specify a timeout see if we can allow else use default of 2 or sumthin?*/

ctrl=highport-lowport;
x=0;
(void) signal(SIGINT, ctrl_c);
while(true){
do
{scanthis=random()%highport;
if(scanthis>=lowport)
{
if((scannode(scanthis)==0))
{
done=0;
for(e=1; e<3;e++)
{if(done==0)
{pthread_create(&threads, NULL,(void*)makesock,(void*)scanthis);
sleep(f);
done=1;}
else{pthread_cancel(threads);/*commenting this bad programming style? faster though?*/
break;};/*if thread joins we should get a connect message right so otherwise we must
terminate the thread correct?*/
x++;};
};/*if scannode*/
}; /*if scanthis*/
}while(x<ctrl); /*for x*/
if(x=ctrl)
break;};/*if true*/
delnode();
printf("Goodbye\n");
return 0;
};

int makesock(int scanthis)
{ struct sockaddr_in address;
int sckfd;
int adrlen,x;
sckfd=socket(AF_INET, SOCK_STREAM, 0);
address.sin_family=AF_INET;
address.sin_addr.s_addr=inet_addr(ipaddress);
address.sin_port=htons(scanthis);
adrlen=sizeof(address);
makenode(scanthis);
x=connect(sckfd,(struct sockaddr*)&address, adrlen);
if(x==0){
ifjoin(scanthis);
};
return 0;
};

void ifjoin(successport)
{

pthread_join(threads,NULL);
printf("port %d open\n",successport);
return;
};

int makenode(int port)
{
static node_t*make;
static nummade;
make=(node_t*)malloc(sizeof(node_t));
make->scaned=port;
make->next=head;
head=make;
make++;
return 0;
};

int scannode(int port)
{
node_t*scan;
scan=head;
while(scan!=NULL)
{if(scan->scaned==port)
return -1;
scan=scan->next;};
return 0;
};

void delnode(void)
{
node_t*deln;
while(head!=NULL)
{deln=head;
head=head->next;
free(deln);
};
return;
};

void ctrl_c(int signal)
{
printf("Received interrupt signal\n");
printf("Please wait while I release allocated memory umkay?\n");
delnode();
exit(0);
return;
};

Trojan

What kind of error message are you getting? Give us some output please.

Al.

Typedef

Specifically I think
undefined reference to __pthread_connect (which is why I find above confusing) if you see the use of connect?
&
undefined reference to __pthread_read , undefined reference to __pthread_write , but it seems as if I could use send recv in place of where I have used these, however the errors with connect or the threaded connect (__pthread_connect which is presumably available in -lpthread, but not in -lc_r)I doubt I would have any luck finding a replacement for connect do you? Also I did seem so have pthread in /usr/local/lib/pthread_someversion - which I tried putting into /usr/lib with relevant symlinks to make pthread.so yeah? And it would seem to compile fine but just not thread yeah? Instead of thread it seems as best it may just execute the function without creating a seperate thread of execution, but what do you expect from a hack like that?
HELP.

Seems as if FreeBSDers are slightly aware of problems with 4.2, but I would like to know if there is some reasonable workaround?



http://gtklex.sourceforge.net/gtklex_1_0.tar.bz2

Trojan

Why not try Slackware



Al.

ecksor

I assume you did a man pthread on FreeBSD and saw this bit?

A FreeBSD specific option has been added to gcc to make linking threaded
processes simple. gcc -pthread links a threaded process against libc_r
instead of libc.

Doesn't look like it does anything different to -lc_r, but you never know ...

Typedef

I'm assuming that (hopefully) the configure script will figure out if pthreads are supported and then link against the right lib as appropiate, here if you want to dload the sources etc
http://gtklex.sourceforge.net

Oh btw if anyone is interested in getting involved in some os project and has some contrib to make then do let me know ok?
cout@eircom.net

moist

Hopefully Gtklex will enable the end user to download files via HTTP or FTP suspend, and resume an indefinate number of times.

Erm whats wrong with 'wget -c' ?

Anyhow, There were thread problems with 4.2 (sadly due to some rushed code changes >:| ) I don't know
of any 'fix' apart from upgrading.
You could search the mailing list archives, or perhaps ask on one of the lists.

I tried the code on my 4.4 machine but it started complaining about autoconf and gnome.
I really don't want to go there at this time in the morning