Can't find library?

[mserougi]

Can anyone help me with this problem? I'm trying to run an application which is linked dynamically to a shared object file, my problem is that the app won't run from the phone itself, but it runs fine from telnet after running the .profile file. I mean that using my Redhat system, I compiled the library using arm and linked the app dynamically to it successfully and now I have the app binary and the .so file. The problem is that from telnet I can put the .so file somewhere where it's found and the app starts fine, but from the phone the app won't start probably cause it can't find the .so file and I just can't figure it out. Has anyone tried using a shared object (.so) with a custom app and running the app from the phone? Maybe anyone can tell me where the .so files should be put (if infact that is the problem) so that the app can be run from the phone and not telnet?

[rpconnect]

when you say "run from the phone" do you mean via a linloader script?

to get around this problem i almost always have a corresponding .sh script to set the paths correctly and then start executing the app, this way it can be started by a .lin script (.lin scripts are started as user ezx and the default paths are only what is in /home/native/.profile)

[mserougi]

no i mean using "linloader" itself and not using a script...by a .sh script do u mean that in the script i set the paths and also run the app from the same script? which brings me to my crucial problem: what paths need to be set for any app to use a .so file? can u maybe show me one of the scripts u used to run an app linked to a .so file?

[rpconnect]

If i had a binary called JoJo, then i'd first make a jojo.sh file that might look something like this:

#!/bin/bash
#

export PATH=$PATH:/diska/.system/bin:<path_to_any_additional_binaries_you_want>

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/diska/.system/.lib:<path_to_any_additional_libs_you_want>

# Sometimes I also add the QTDIR to LD_LIBRARY_PATH
# and set EZX_RES_FONT_PATH here to run ezx apps

# (i usually cd to the desired directory in case there are any relative
#  paths to comply with)
cd /diska/<wherever_the_JoJo_app_is>
./JoJo

then make the jojo.lin script to start the app as root:

#!/bin/bash
#

start-stop-daemon --start -c root -x /diska/<path_to_jojo.sh_file>/JoJo.sh &

although you do not have to start all apps as root, i often want the app to have root access (for bluetooth utils and config for example) so i tend to have the .lin script start things as root as my default m.o.

hope this helps...

[mserougi]

export LD_LIBRARY=$LD_LIBRARY_PATH:/diska/.system/.lib:<path_to_any_additional_libs_you_want>
[/code:1:83ad0270eb]

just to be sure about this: do u mean LD_LIBRARY_PATH=$LD_LIBRARY_PATH... or is it exactly as it is above? i'll definitely give this a try tomorrow...

[rpconnect]

@mserougi
yeah, i made a mistake when typing, it should be LD_LIBRARY_PATH=$LD_LIBRARY_PATH:... (i've fixed it now in the listing above) sorry for the confusion

[mserougi]

and it's definitely working! thx alot rpconnect by the way i got http working over sockets so if u ever need such functionality then let me know...

[rpconnect]

glad to know you got it working

i'm a complete newb to http, over sockets or otherwise, but i (and maybe some others?) would love to see some example code. i have a gumstix that i connnect to via the e680 over pand and the http socket access might lead to some interesting control possibilites.

can you share (post?) some of your example code?

[mserougi]

sure

following is the code to create a socket under linux, use it to send an HTTP request and then receive the response in a buffer, and if it's a file then i guess it'll just be downloaded:

#include <string>

#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>

#define HTTP_PORT 80
const std::string IP_ADDRESS = "xxx.xxx.xxx.xxx";
#define BUFF_SIZE 8192

int main(int argc, char** argv)
{
	struct sockaddr_in server;
	struct hostent* host_info;
	unsigned long addr;
	int sock;
	char buffer[BUFF_SIZE];
	int count;
	
	/* create socket */
	sock = socket( PF_INET, SOCK_STREAM, 0);
	if (sock < 0)
	{
		perror( "failed to create socket");
		exit(1);
	}
	
	memset( &server, 0, sizeof (server));
	/* convert servername to IP address */
	host_info = gethostbyname(IP_ADDRESS.c_str());
	if (NULL == host_info)
	{
		printf("unknown server");
		exit(1);
	}
	memcpy( (char *)&server.sin_addr, host_info->h_addr, host_info->h_length);
	
	server.sin_family = AF_INET;
	server.sin_port = htons( HTTP_PORT);
	
	/* connect to the server */
	if ( connect( sock, (struct sockaddr*)&server, sizeof( server)) < 0)
	{
		perror( "can't connect to server");
		exit(1);
	}
	
	/* create and send the http GET request */
	std::string tRequest = "GET /file.txt /*here we're targeting http://xxx.xxx.xxx.xxx/file.txt and we wanna download that file as an example*/HTTP/1.1 \nHost:" + IP_ADDRESS + "\n\n";
	send( sock, tRequest.c_str(), tRequest.length(), 0);
	
	do
	{
		count = recv( sock, buffer, sizeof(buffer), 0);
		// and we have our response stored in the buffer, safe and sound
	}
	while (count > 0);
	return 0;
}