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i am writing a milter which decrypts the email message.
For decryption i am using GMP library...
The code which gives the error is as follows:
mpz_t bigbody,encbody,decbody,n,d,e;
mpz_init_set_str (e, "5", 10);
mpz_init_set_str (n, "81072118814004638617775947138239917744589505176471539666269773100315781097546894455560658571445286325125766632676152452856383447352821337178984474781813475276075048299705214136395672502245955793627681061360075723595075874516950614187016991430293887968216015097675955399134514678660046996064181098182893072761", 10);
mpz_init_set_str (d, "32428847525601855447110378855295967097835802070588615866507909240126312439018757782224263428578114530050306653070460981142553378941128534871593789912725382636961637010791821646038659077539848411532121133465246631106852802485583932352673149866783600963924490576147444236696494852521901563664557493382382127469", 10);
char *STR;
STR=(char*)malloc(1000);
mpz_t array[10];
//mpz_array_init (array, 10, 308);
mpz_t array1[10];
//mpz_array_init (array1, 10, 100000);
char substring[400];
int i=0,lower=0,upper=308;
while(i<noofblocks)
{
="" strncpy(substring,="" data_buffer="" +="" lower,="" upper);
="" *(substring+308)="\0" ;
="" syslog(="" log_info,="" "conn#="" %d="" -="" substring="%s"," cd-="">connection_num, substring );
lower=upper;
upper=upper+308;
mpz_init_set_str(array[i],substring,10);
mpz_get_str (STR, 10, array[i]);
strcat(STR,"\0");
syslog( LOG_INFO, "conn# %d - Encrypted-Biginteger = %s", cd->connection_num, STR );
mpz_init(array1[i]);
mpz_powm (array1[i], array[i], d, n);
mpz_get_str (STR, 10, array1[i]);
syslog( LOG_INFO, "conn# %d - Decrypted-Biginteger = %s", cd->connection_num, STR );
size_t length;
void *ret;
char *decrypted;
decrypted=(char*)malloc(1000);
ret=mpz_export (decrypted, &length, 1,sizeof(data_buffer[0]), 0, 0, array1[i]);
//ret=mpz_export (decrypted, &length, 1,sizeof(data_buffer[0]), 0, 0, array1[i]);
strncpy(decrypted,ret,length);
*(decrypted+length)='\0';
syslog( LOG_INFO, "conn# %d - size decrypted = %d Decrypted = %s", cd->connection_num,length, (char *)ret );
fflush(stdout);
free(decrypted);
fflush(stdin);
mpz_clear(array[i]);
mpz_clear(array1[i]);
i++;
}
This code executes for 2 iterations and then give segmentation fault at mpz_powm( )
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shrims4u wrote: ...then give segmentation fault at mpz_powm( )
What are the values of array1[i], array[i], d, and n at that point?
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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the value of array[i] is a bignumber....
Also d and n are initialised...
The error is at mpz_powm....
you want me to write the values in numbers????
Actually it differs each time according to the message
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My, point, although subtle, was to ensure that the values you are passing to that function are valid. Some functions/libraries place the onus of validation solely on the caller (rather than handle the bad input and fail gracefully)
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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yah the values that are passed are proper...
The gdb output is as follows....
[New Thread -1208882288 (LWP 9012)]
[New Thread -1208879424 (LWP 9009)]
[New Thread -1219372144 (LWP 9017)]
GNU MP: Cannot allocate memory (size=3368600780)
Program received signal SIGABRT, Aborted.
[Switching to Thread -1219372144 (LWP 9017)]
0x00110402 in __kernel_vsyscall ()
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shrims4u wrote: GNU MP: Cannot allocate memory (size=3368600780)
I would guess that this is related to the problem. It's tried to allocate 3 Gb of memory, and failed...
As to why it's trying to allocate such a big chunk of memory, I couldn't say, but maybe stepping through until you get that error might help pin it down.
There are three kinds of people in the world - those who can count and those who can't...
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Actually it is a milter which decrypts the incoming mail messages...
<br />
<br />
<br />
#include <stdio.h><br />
#include <stdlib.h><br />
#include <unistd.h><br />
#include <string.h><br />
#include <pthread.h><br />
#include <syslog.h><br />
#include <sys/types.h><br />
#include <sys/socket.h><br />
#include <netinet/in.h><br />
#include <arpa/inet.h><br />
#include <sys/stat.h><br />
#include <fcntl.h><br />
<br />
#include <glib.h><br />
#include <gmime/gmime.h><br />
<br />
#include "libmilter/mfapi.h"<br />
<br />
#include "gmp.h"<br />
<br />
<br />
<br />
<br />
static void usage( void );<br />
static sfsistat sample_connect( SMFICTX* ctx, char* connhost, _SOCK_ADDR* connaddr );<br />
static sfsistat sample_helo( SMFICTX* ctx, char* helohost );<br />
static sfsistat sample_envfrom( SMFICTX* ctx, char** fromargs );<br />
static sfsistat sample_envrcpt( SMFICTX* ctx, char** rcptargs );<br />
static sfsistat sample_header( SMFICTX* ctx, char* name, char* value );<br />
static sfsistat sample_eoh( SMFICTX* ctx );<br />
static sfsistat sample_body( SMFICTX* ctx, unsigned char* bytes, size_t len );<br />
static sfsistat sample_eom( SMFICTX* ctx );<br />
static sfsistat sample_abort( SMFICTX* ctx );<br />
static sfsistat sample_close( SMFICTX* ctx );<br />
static void thread_data_destructor( void* data );<br />
<br />
int smfi_replacebody(<br />
SMFICTX *ctx,<br />
unsigned char *bodyp,<br />
int bodylen<br />
);<br />
<br />
<br />
int smfi_chgheader(<br />
SMFICTX *ctx,<br />
char *name,<br />
int hdridx,<br />
char *value<br />
);<br />
<br />
<br />
<br />
<br />
static char* argv0;<br />
static pthread_key_t key;<br />
static int connections;<br />
static char* data_buffer, *contentTypeBuffer;<br />
void *ret;
size_t size;<br />
int flag=0;<br />
<br />
GMimeMessage *message;<br />
GMimeStream *stream;<br />
GMimeParser *parser;<br />
GMimeMultipart *multipart;<br />
GMimePart *mime_part,*mime_part0;<br />
GMimeContentType *contentType,*contentType1;<br />
<br />
static struct smfiDesc smfilter =<br />
{<br />
"SAMPLE", <br />
SMFI_VERSION, <br />
SMFIF_CHGBODY | SMFIF_CHGHDRS, <br />
sample_connect, <br />
sample_helo, <br />
sample_envfrom, <br />
sample_envrcpt, <br />
sample_header, <br />
sample_eoh, <br />
sample_body, <br />
sample_eom, <br />
sample_abort, <br />
sample_close <br />
};<br />
<br />
<br />
int<br />
main( int argc, char** argv )<br />
{<br />
char* sockarg;<br />
<br />
<br />
<br />
g_mime_init (0);<br />
<br />
message = g_mime_message_new(FALSE);<br />
<br />
<br />
argv0 = strrchr( argv[0], '/' );<br />
if ( argv0 != (char*) 0 )<br />
++argv0;<br />
else<br />
argv0 = argv[0];<br />
<br />
connections = 0;<br />
<br />
if ( argc != 2 )<br />
usage();<br />
sockarg = argv[1];<br />
<br />
if ( pthread_key_create( &key, &thread_data_destructor ) )<br />
{<br />
perror( "pthread_key_create" );<br />
exit( 1 );<br />
}<br />
<br />
openlog( argv0, 0, LOG_MAIL );<br />
<br />
(void) smfi_setconn( sockarg );<br />
if ( smfi_register( smfilter ) == MI_FAILURE )<br />
{<br />
(void) fprintf( stderr, "%s: register failed\n", argv0 );<br />
exit( 1 );<br />
}<br />
if ( smfi_main() == MI_FAILURE )<br />
{<br />
(void) fprintf( stderr, "%s: milter failed\n", argv0 );<br />
exit( 1 );<br />
}<br />
<br />
syslog( LOG_INFO, "exitting - %d connections", connections );<br />
(void) pthread_key_delete( key );<br />
closelog();<br />
<br />
<br />
exit( 0 );<br />
}<br />
<br />
<br />
static void<br />
usage( void )<br />
{<br />
(void) fprintf( stderr, "usage: %s socket\n", argv0 );<br />
exit( 1 );<br />
}<br />
<br />
<br />
<br />
<br />
<br />
<br />
struct thread_data {<br />
int junk;<br />
};<br />
<br />
<br />
struct connection_data {<br />
int connection_num;<br />
int messages;<br />
int recipients;<br />
int headers;<br />
int bodyblocks;<br />
size_t bodybytes;<br />
int aborts;<br />
};<br />
<br />
<br />
<br />
static sfsistat<br />
sample_connect( SMFICTX* ctx, char* connhost, _SOCK_ADDR* connaddr )<br />
{<br />
struct thread_data* td;<br />
struct connection_data* cd;<br />
struct sockaddr_in* sin;<br />
<br />
td = (struct thread_data*) pthread_getspecific( key );<br />
if ( td == (struct thread_data*) 0 )<br />
{<br />
td = (struct thread_data*) malloc( sizeof(struct thread_data) );<br />
if ( td == (struct thread_data*) 0 )<br />
return SMFIS_TEMPFAIL;<br />
if ( pthread_setspecific( key, (void*) td ) )<br />
{<br />
free( (void*) td );<br />
return SMFIS_TEMPFAIL;<br />
}<br />
}<br />
<br />
cd = (struct connection_data*) malloc( sizeof(struct connection_data) );<br />
if ( cd == (struct connection_data*) 0 )<br />
return SMFIS_TEMPFAIL;<br />
(void) smfi_setpriv( ctx, (void*) cd );<br />
cd->connection_num = ++connections;<br />
<br />
sin = (struct sockaddr_in*) connaddr;<br />
syslog( LOG_INFO, "conn# %d - sample_connect( \"%s\" [%s] )", cd->connection_num, connhost, inet_ntoa( sin->sin_addr ) );<br />
<br />
cd->messages = 0;<br />
cd->aborts = 0;<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_helo( SMFICTX* ctx, char* helohost )<br />
{<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
syslog( LOG_INFO, "conn# %d - sample_helo( \"%s\" )", cd->connection_num, helohost );<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_envfrom( SMFICTX* ctx, char** fromargs )<br />
{<br />
data_buffer=(char*)malloc(100000000);<br />
<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
syslog( LOG_INFO, "conn# %d - sample_envfrom( \"%s\" )", cd->connection_num, fromargs[0] );<br />
<br />
<br />
++cd->messages;<br />
cd->recipients = 0;<br />
cd->headers = 0;<br />
cd->bodyblocks = 0;<br />
cd->bodybytes = 0;<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_envrcpt( SMFICTX* ctx, char** rcptargs )<br />
{<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
syslog( LOG_INFO, "conn# %d - sample_envrcpt( \"%s\" )", cd->connection_num, rcptargs[0] );<br />
<br />
++cd->recipients;<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_header( SMFICTX* ctx, char* name, char* value )<br />
{<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
syslog( LOG_INFO, "conn# %d - sample_header( \"%s\", \"%s\" )", cd->connection_num, name, value );<br />
<br />
++cd->headers;<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_eoh( SMFICTX* ctx )<br />
{<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
syslog( LOG_INFO, "conn# %d - sample_eoh()", cd->connection_num );<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_body( SMFICTX* ctx, unsigned char* bytes, size_t len )<br />
{<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
<br />
strncat(data_buffer, bytes, len);<br />
<br />
++cd->bodyblocks;<br />
cd->bodybytes += len;<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_eom( SMFICTX* ctx )<br />
{<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
syslog( LOG_INFO, "conn# %d - sample_eom(), %d recipients, %d headers, %d bodyblocks with %d bytes", cd->connection_num, cd->recipients, cd->headers, cd->bodyblocks, (int) cd->bodybytes );<br />
<br />
<br />
<br />
<br />
<br />
<br />
stream = g_mime_stream_mem_new_with_buffer (data_buffer, strlen(data_buffer) );<br />
<br />
<br />
parser = g_mime_parser_new_with_stream (stream);<br />
<br />
<br />
g_object_unref (stream);<br />
<br />
<br />
message = g_mime_parser_construct_message (parser);<br />
<br />
<br />
g_object_unref (parser);<br />
<br />
<br />
gboolean *is_html;<br />
const char *content = g_mime_message_get_body ( message , FALSE , is_html);<br />
strncpy(data_buffer,content,strlen(content));<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
syslog( LOG_INFO, "conn# %d - body = %s", cd->connection_num, content );<br />
<br />
int noOfBlocks = strlen(data_buffer)/308;<br />
syslog( LOG_INFO, "conn# %d - body = %d no of blocks = %d", cd->connection_num, strlen(data_buffer), noOfBlocks );<br />
<br />
mpz_t bigbody,encbody,decbody,n,d,e;<br />
<br />
<br />
<br />
mpz_init_set_str (e, "5", 10);<br />
<br />
mpz_init_set_str (n, "81072118814004638617775947138239917744589505176471539666269773100315781097546894455560658571445286325125766632676152452856383447352821337178984474781813475276075048299705214136395672502245955793627681061360075723595075874516950614187016991430293887968216015097675955399134514678660046996064181098182893072761", 10);<br />
<br />
mpz_init_set_str (d, "32428847525601855447110378855295967097835802070588615866507909240126312439018757782224263428578114530050306653070460981142553378941128534871593789912725382636961637010791821646038659077539848411532121133465246631106852802485583932352673149866783600963924490576147444236696494852521901563664557493382382127469", 10);<br />
<br />
<br />
<br />
char *STR;<br />
STR=(char*)malloc(1000);<br />
<br />
<br />
mpz_t array[10];<br />
mpz_array_init (array, 10, 308);<br />
mpz_t array1[10];<br />
mpz_array_init (array1, 10, 100000);<br />
<br />
char substring[400];<br />
int i=0,lower=0,upper=308;<br />
while(i<noOfBlocks)<br />
{ <br />
<br />
<br />
<br />
<br />
syslog( LOG_INFO, "conn# %d - i = %d", cd->connection_num, i );<br />
strncpy(substring, data_buffer + lower, upper);<br />
*(substring+308)='\0';<br />
syslog( LOG_INFO, "conn# %d - substring = %s", cd->connection_num, substring );<br />
lower=upper;<br />
upper=upper+308;<br />
<br />
<br />
<br />
<br />
<br />
mpz_init_set_str(array[i],substring,10);<br />
<br />
<br />
<br />
<br />
mpz_get_str (STR, 10, array[i]);<br />
strcat(STR,"\0");<br />
syslog( LOG_INFO, "conn# %d - Encrypted-Biginteger = %s", cd->connection_num, STR );<br />
<br />
<br />
<br />
mpz_init(array1[i]);<br />
mpz_powm (array1[i], array[i], d, n);<br />
<br />
<br />
mpz_get_str (STR, 10, array1[i]);<br />
syslog( LOG_INFO, "conn# %d - Decrypted-Biginteger = %s", cd->connection_num, STR );<br />
<br />
size_t length;<br />
void *ret;<br />
char *decrypted;<br />
decrypted=(char*)malloc(1000);<br />
<br />
ret=mpz_export (decrypted, &length, 1,sizeof(data_buffer[0]), 0, 0, array1[i]);<br />
<br />
strncpy(decrypted,ret,length);<br />
*(decrypted+length)='\0';<br />
<br />
<br />
syslog( LOG_INFO, "conn# %d - size decrypted = %d Decrypted = %s", cd->connection_num,length, (char *)ret );<br />
fflush(stdout);<br />
<br />
free(decrypted);<br />
fflush(stdin);<br />
fflush(stdout);<br />
i++;<br />
<br />
}<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_abort( SMFICTX* ctx )<br />
{<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
syslog( LOG_INFO, "conn# %d - sample_abort(), %d recipients, %d headers, %d bodyblocks with %d bytes", cd->connection_num, cd->recipients, cd->headers, cd->bodyblocks, (int) cd->bodybytes );<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
<br />
static sfsistat<br />
sample_close( SMFICTX* ctx )<br />
{<br />
struct connection_data* cd = (struct connection_data*) smfi_getpriv( ctx );<br />
<br />
syslog( LOG_INFO, "conn# %d - sample_close(), %d messages", cd->connection_num, cd->messages );<br />
<br />
if ( cd != (struct connection_data*) 0 )<br />
{<br />
(void) smfi_setpriv( ctx, (void*) 0 );<br />
free( (void*) cd );<br />
}<br />
<br />
return SMFIS_CONTINUE;<br />
}<br />
<br />
<br />
static void<br />
thread_data_destructor( void* data )<br />
{<br />
struct thread_data* td = (struct thread_data*) data;<br />
<br />
free( (void*) td );<br />
}
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I dint understand what you want me to do...
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Somewhere the program is trying to allocate a very large amount of memory. This is, I think, the cause of your problem. I haven't used this library/package, but I'm basing my conclusion on the error mesage you posted (see my last reply).
What I suggest is that you use a debugging tool to step through the program until it generates that error, and take a close look at exactly what is happening at that point. Or post here exactly which line is causing the problem.
There are three kinds of people in the world - those who can count and those who can't...
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Also i get this message from gdb.....
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1218634864 (LWP 9064)]
0x06d0199c in __gmpz_powm () from /usr/lib/sse2/libgmp.so.3
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You certainly did not deserve to be down voted for that response.
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i dint understand???
wat is down voting???
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When a response receives a 1 vote (located at the bottom right of the response).
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will you please help me???
you understood my problem?
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1. Be organized classes and write the application to allow load and display all kinds of image files with the extensions in the following categories. Jpg,. Bmp,. Dib,. Gif. Programs that change the image as horizontal turn, vertical (mirror), dial 900, the gray level to get the sound, get the wrong picture of the two special functions and stored into different (but still one of the significantly above).
Requirements: The thought by the audience. Can be programmed in the Windows environment. Do not use static function as eg in the theory, does not switch, in the case.
2. An "input directory" is a folder or a file, a directory of many "input folder". Drive is a special case of the directory. Be organized classes to perform concept computer, disk drive, folder, file with the relationship as over. Write the application for permission to view the content of the object type as similar functions of the software Tree NC.
3. For the types: circle, ellipse image, the polygon, crescent,'s wings, rhombus, parallelogram, trapezium, rectangle, square, triangle, triangle square, square triangle needed. Write a program that allows applications to create (or enter) the two pictures in one of the above. Notice in two pictures that are not intersecting, if any color to the bowl and the dark sea of the interface. The user can press the arrow keys to move one of two pictures, the +, - to zoom out one of the two pictures. Programs can work with all kinds of equipment in different graphics modes, text mode (each a '*' is a moral pixels). Program can zoom to pixel morally, from the graphics mode to text or vice versa, users do not see the object to be exhaustive or bé tí hon.
4. A road of many road Polyline (line), each line can be a straight section (Strait line), and (ARC), or a bezier polyline. Organization of classes necessary, establish the relationship between class and write a program that allows to create polyline, create a copy of the polyline, zoom in, zoom out, turn polyline, polyline separation (separation of the polyline in the a polyline into the road (line, arc, bezier), define two functions have polyline cross or not?
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Instead of keep posting the same message here all the time, why don't you redirect that effort into learning about your subject so you can do your homework.
Once you have specific queries about the technologies you're using, ask those specific queries - you're more likely to get a positive result.
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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See here.
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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It's still hard? For 2 days? You should really do something to remedy this. Go grab some tissues, lock yourself into a quiet room and go nuts. Afterwards it will be much easier to concentrate on the programming problem and solve it in no time!
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plz send me codez, sir. 
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Hello
I have a problem and will be very appreciated if somebody can help me with it.
We have software which run 3rd party tools and read response from StdOut.
How this implemented:
Main software create 2 pipes
Then create process for 3rd party tool and assign these pipes
Then read all data what send to StdOut of created process
And that very good works on Win95-WinXP.
But not under Vista.
Under Vista I cannot read any data from *.com files (old DOS format files).
Anybody know what can be reason?
Does Vista have some restriction for this files?
Any security issues?
Under WinXP any problem, all works very good with *.com and *.exe.
Also when I run in command line:
C:\Temp\>cc51.com > res.txt
res.txt is empty.
(cc51.com is the tool what we run in created process).
Any help will be appreciated.
Igor
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Thank you for answer.
I read these articles, but this is not my case.
I have 32 bit Vista and I can run this application and they work well.
The only issue - I cannot get output.
Any other ideas?
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Slepchenkov wrote: I have 32 bit Vista and I can run this application and they work well.
Did you mean that the .com application is working well in Vista ? Could you please explain how you made that conclusion ? 
Could you please share what happened when you type
C:\Temp\>cc51.com and the message/output you seen at your console ?
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Please see screen shot with command window:
www.bipom.com/support/cc51shot.png
As you see i started new command line in Windows Vista and run cc51.com.
It runs and return usage info.
Any other messages/warnings.
So it works.
This is compiler for C programs. I also can compile files under Vista with it.
So it works well.
Please note, I have Vista 32bit, not 64bit.
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Since I don't have a copy of cc51.com, I couldn't do any more tests to find out your problem  Sorry.
But from the sample screen and your original post, I have a question,
Are you missing something ?
The usage of CC51.com shows that you have to give the <name> right ? And the options too...
is it like C:\Temp>CC51.com some_file.c -q > res.txt
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