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ipref3 dll for windows

I try to build ipref3.dll for windows

I found How to compile iperf3 for Windows

Built it but i got only iperf3.exe and libiperf.a

I found, how create dll manual

gcc -s -shared -o iperf3.dll units.o timer.o tcp_window_size.o tcp_info.o net.o iperf_util.o iperf_sctp.o iperf_udp.o iperf_tcp.o iperf_server_api.o iperf_locale.o iperf_client_api.o iperf_error.o iperf_api.o cjson.o -Wl,--enable-auto-import,--export-all-symbols,--subsystem,windows


after i found how need to initialize

HMODULE h = LoadLibrary(TEXT("cygwin1.dll"));
PFN_CYGWIN_DLL_INIT init = (PFN_CYGWIN_DLL_INIT)GetProcAddress(h, "cygwin_dll_init");
init();


Now i can load dll and make initialization but when i start test iperf_run_client application is crashed

Unhandled exception at 0x611537C0 (cygwin1.dll) in iprerf-server.exe:
0xC0000005: Access violation reading location 0x00740000.

How can solve this problem?

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <WinSock2.h>
//#include <unistd.h>
#include <string.h>
//#include <sysexits.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif

#include "iperf_api.h"

#ifdef WIN64
#pragma comment(lib, "iperf3_64.lib")
#else
#pragma comment(lib, "iperf3.lib")
#endif

#pragma comment(lib, "ws2_32.lib")


typedef void *register_frame();
typedef int *hello_f();

typedef int(*PFN_HELLO)();
typedef void(*PFN_CYGWIN_DLL_INIT)();

#pragma pack(push, 1)

int main(int argc, char** argv)

WSADATA wsaData;
int wsaErr = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (wsaErr != 0)
printf("WSAStartup failed with error: %dn", wsaErr);
return 1;


//PFN_HELLO fnHello;
HMODULE /*hLib, */h = LoadLibrary(TEXT("cygwin1.dll"));
PFN_CYGWIN_DLL_INIT init = (PFN_CYGWIN_DLL_INIT)GetProcAddress(h, "cygwin_dll_init");
init();

char* argv0;
char* host;
int port;
struct iperf_test *test;

argv0 = strrchr(argv[0], '/');
if (argv0 != (char*)0)
++argv0;
else
argv0 = argv[0];

if (argc != 3)
fprintf(stderr, "usage: %s [host] [port]n", argv0);
exit(EXIT_FAILURE);

host = argv[1];
port = atoi(argv[2]);

test = iperf_new_test();
if (test == NULL)
fprintf(stderr, "%s: failed to create testn", argv0);
exit(EXIT_FAILURE);

iperf_defaults(test);
iperf_set_verbose(test, 1);

iperf_set_test_role(test, 'c');
iperf_set_test_server_hostname(test, host);
iperf_set_test_server_port(test, port);
/* iperf_set_test_reverse( test, 1 ); */
iperf_set_test_omit(test, 3);
iperf_set_test_duration(test, 5);
iperf_set_test_reporter_interval(test, 1);
iperf_set_test_stats_interval(test, 1);
/* iperf_set_test_json_output( test, 1 ); */

if (iperf_run_client(test) < 0)
fprintf(stderr, "%s: error - %sn", argv0, iperf_strerror(i_errno));
exit(EXIT_FAILURE);


if (iperf_get_test_json_output_string(test))
fprintf(iperf_get_test_outfile(test), "%zd bytes of JSON emittedn",
strlen(iperf_get_test_json_output_string(test)));


iperf_free_test(test);
exit(EXIT_SUCCESS);




2 Answers
2

The reason why the shared lib is not built is:

libtool: warning: undefined symbols not allowed in x86_64-unknown-cygwin
shared libraries; building static only


the easy way to bypass it, in a clean build is to use:

$ make libiperf_la_LIBADD="-no-undefined"


The build will include the shared libray and the import library

$ find . -name "*dll*"
./src/.libs/cygiperf-0.dll
./src/.libs/libiperf.dll.a


For what I see to make a build on cygwin is also needed to remove a definition
in src/iperf_config.h after running configure

src/iperf_config.h

configure

/* #define HAVE_SETPROCESSAFFINITYMASK 1 */


PS #1: iperf-2.0.5-1 is available as cygwin package

PS #2: your code is Windows-like while Cygwin is a Unix-like system, you can not mix them

I found solution

1) It need to create addition dll: my_crt0.dll

#include <sys/cygwin.h>
#include <stdlib.h>

typedef int (*MainFunc) (int argc, char *argv, char **env);

void my_crt0 (MainFunc f)

cygwin_crt0(f);



gcc -c my_crt0.c
gcc -o my_crt0.dll my_crt0.o -s -shared -Wl,--subsystem,windows,--enable-auto-import,--export-all-symbols,--out-implib,my_crt0.lib


2) Modify main code

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <WinSock2.h>
#include <string.h>

#include "iperf_api.h"

#pragma comment(lib, "iperf3.lib")
#pragma comment(lib, "ws2_32.lib")

typedef int(*MainFunc) (int argc, char *argv, char **env);
typedef void(*my_crt0)(MainFunc f);

int main2(int argc, char** argv, char **env)

char* argv0;
char* host;
int port;
struct iperf_test *test;

host = (char*)"127.0.0.1";
port = 4000;

test = iperf_new_test();
if (test == NULL)
exit(EXIT_FAILURE);


iperf_defaults(test);
iperf_set_verbose(test, 1);

iperf_set_test_role(test, 'c');
iperf_set_test_server_hostname(test, host);
iperf_set_test_server_port(test, port);
/* iperf_set_test_reverse( test, 1 ); */
iperf_set_test_omit(test, 3);
iperf_set_test_duration(test, 5);
iperf_set_test_reporter_interval(test, 1);
iperf_set_test_stats_interval(test, 1);
/* iperf_set_test_json_output( test, 1 ); */

iperf_strerror(0);

if (iperf_run_client(test) < 0)
fprintf(stderr, "%s: error - %sn", argv0, iperf_strerror(i_errno));
exit(EXIT_FAILURE);


if (iperf_get_test_json_output_string(test))
fprintf(iperf_get_test_outfile(test), "%zd bytes of JSON emittedn",
strlen(iperf_get_test_json_output_string(test)));


iperf_free_test(test);
exit(EXIT_SUCCESS);

return 1;


int main(int argc, char** argv)

WSADATA wsaData;
int wsaErr = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (wsaErr != 0)
printf("WSAStartup failed with error: %dn", wsaErr);
return 1;



HMODULE /*hLib, */h = LoadLibrary(TEXT("my_crt0.dll"));
my_crt0 init = (my_crt0)GetProcAddress(h, "my_crt0");
init(main2);


exit(EXIT_SUCCESS);



Now it compiled and worked to VS 2015

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