【发布时间】：2014-03-27 07:49:24
【问题描述】：
#include <features.h>
#include <time.h>
#include <sys/time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define million 1000000L
timer_t firstTimerID, secondTimerID, thirdTimerID;
double Task2ms_Raster, Task10ms_Raster, Task100ms_Raster;
struct sockaddr_in addr, client;
int acceptSocket;
char buf[1024];
char a[128];
long rc, sentbytes;
int port = 18033;
void TASK1(Task2ms_Raster)
{
struct timespec start, stop;
uint32 startTime, stopTime;
if( (startTime = clock_gettime( CLOCK_REALTIME, &start)) == -1 ) {
perror("clock gettime");
}
startTime =start.tv_sec + 0.00000001 * start.tv_nsec;
// printf("start time is %lf", StartTime);
// return EXIT_SUCCESS;
/* Trigger DAQ for the 2ms XCP raster. */
if( XCPEVENT_DAQ_OVERLOAD & Xcp_DoDaqForEvent_2msRstr( ))
{
++numDaqOverload2ms;
}
/* Update those variables which are modified every 2ms. */
counter32 += slope32;
/* Trigger STIM for the 2ms XCP raster. */
if( enableBypass2ms )
{
if( XCPEVENT_MISSING_DTO & Xcp_DoStimForEvent_2msRstr( ) )
{
++numMissingDto2ms;
}
}
if( (stopTime = clock_gettime( CLOCK_REALTIME, &stop)) == -1 ) {
perror( "clock gettime" );
}
stopTime = stop.tv_sec + 0.00000001 * stop.tv_nsec;
//printf("stop time is %ld", stopTime);
duration2ms = (stopTime- startTime);
// printf( "time difference is= %ld\n", duration2ms );
}
void TASK2(Task10ms_Raster)
{
struct timespec start, stop;
uint32 startTime, stopTime;
if( (startTime = clock_gettime( CLOCK_REALTIME, &start)) == -1 ) {
perror( "clock gettime" );
}
startTime =start.tv_sec + 0.00000001 * start.tv_nsec;
// printf("start time is %lf", StartTime);
/* Trigger DAQ for the 10ms XCP raster. */
if( XCPEVENT_DAQ_OVERLOAD & Xcp_DoDaqForEvent_10msRstr( ))
{
++numDaqOverload10ms;
}
/* Update those variables which are modified every 10ms. */
counter16 += slope16;
/* Trigger STIM for the 10ms XCP raster. */
if( enableBypass10ms )
{
if( XCPEVENT_MISSING_DTO & Xcp_DoStimForEvent_10msRstr( ) )
{
++numMissingDto10ms;
}
}
if( (stopTime = clock_gettime( CLOCK_REALTIME, &stop)) == -1 ) {
perror( "clock gettime" );
}
Xcp_CmdProcessor();
stopTime = stop.tv_sec + 0.00000001 * stop.tv_nsec;
//printf("stop time is %lf", stopTime);
duration10ms = ( stop.tv_sec - start.tv_sec )
+ (double)( stop.tv_nsec - start.tv_nsec )
/ (double)million;
// printf( "time difference is= %ld\n", duration10ms );
}
void TASK3(Task100ms_Raster)
{
struct timespec start, stop;
uint32 startTime, stopTime;
if( (startTime = clock_gettime( CLOCK_REALTIME, &start)) == -1 )
{
perror("clock gettime");
}
startTime =start.tv_sec + 0.00000001 * start.tv_nsec;
// printf("start time is %lf", startTime);
/* Trigger DAQ for the 100ms XCP raster. */
if( XCPEVENT_DAQ_OVERLOAD & Xcp_DoDaqForEvent_100msRstr( ))
{
++numDaqOverload100ms;
}
/* Update those variables which are modified every 100ms. */
counter8 += slope8;
/* Trigger STIM for the 100ms XCP raster. */
if( enableBypass100ms )
{
if( XCPEVENT_MISSING_DTO & Xcp_DoStimForEvent_100msRstr( ) )
{
++numMissingDto100ms;
}
}
if((stopTime = clock_gettime( CLOCK_REALTIME, &stop)) == -1 ) {
perror( "clock gettime" );
}
stopTime = stop.tv_sec + 0.00000001 * stop.tv_nsec;
// printf("stop time is %lf", stopTime);
duration100ms = ( stop.tv_sec - start.tv_sec )
+ (double)( stop.tv_nsec - start.tv_nsec )
/ (double)million;
// printf( "time difference is= %ld\n", duration100ms );
}
static void timerHandler( int sig, siginfo_t *si, void *uc )
{
timer_t *tidp;
tidp = si->si_value.sival_ptr;
if ( *tidp == firstTimerID )
TASK1(Task2ms_Raster);
else if ( *tidp == secondTimerID )
TASK2(Task10ms_Raster);
else if ( *tidp == thirdTimerID )
TASK3(Task100ms_Raster);
}
static int makeTimer( char *name, timer_t *timerID, int expireMS, int intervalMS )
{
struct sigevent te;
struct itimerspec its;
struct sigaction sa;
int sigNo = SIGRTMIN;
/* Set up signal handler. */
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = timerHandler;
sigemptyset(&sa.sa_mask);
if (sigaction(sigNo, &sa, NULL) == -1)
{
perror("sigaction");
}
/* Set and enable alarm */
te.sigev_notify = SIGEV_SIGNAL;
te.sigev_signo = sigNo;
te.sigev_value.sival_ptr = timerID;
timer_create(CLOCK_REALTIME, &te, timerID);
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = intervalMS * 1000000;
its.it_value.tv_sec = 0;
its.it_value.tv_nsec = expireMS * 1000000;
timer_settime(*timerID, 0, &its, NULL);
return 1;
}
int CreateSocket()
{
socklen_t len = sizeof(client);
// Socket creation for UDP
acceptSocket=socket(AF_INET,SOCK_DGRAM,0);
if(acceptSocket==-1)
{
printf("Failure: socket creation is failed, failure code\n");
return 1;
}
else
{
printf("Socket started!\n");
}
memset(&addr, 0, sizeof(addr));
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
addr.sin_addr.s_addr=htonl(INADDR_ANY);
rc=bind(acceptSocket,(struct sockaddr*)&addr,sizeof(addr));
if(rc== -1)
{
printf("Failure: listen, failure code:\n");
return 1;
}
else
{
printf("Socket an port %d \n",port);
}
if(acceptSocket == -1)
{
printf("Fehler: accept, fehler code:\n");
return 1;
}
else
{
while(rc!=-1)
{
rc=recvfrom(acceptSocket,buf, sizeof(buf), 0, (struct sockaddr*) &client, &len);
if(rc==0)
{
printf("Server has no connection..\n");
break;
}
if(rc==-1)
{
printf("something went wrong with data %s", strerror(errno));
break;
}
XcpIp_RxCallback( (uint16) rc, (uint8*) buf, (uint16) port );
makeTimer("First Timer", &firstTimerID, 2, 2); //2ms
makeTimer("Second Timer", &secondTimerID, 10, 10); //10ms
makeTimer("Third Timer", &thirdTimerID, 100, 100); //100ms
}
}
close(acceptSocket);
return 0;
}
int main()
{
Xcp_Initialize();
CreateSocket();
return 0;
}
void XcpApp_IpTransmit( uint16 XcpPort, Xcp_StatePtr8 pBytes, uint16 numBytes )
{
if ((long)XcpPort==port){
sentbytes = sendto(acceptSocket,(char*)pBytes,(long)numBytes,0, (struct sockaddr*)&client, sizeof(client));
}
XcpIp_TxCallback(port,(uint16)sentbytes);
}
我正在研究客户端和服务器架构。我的代码工作正常，服务器正在等待来自客户端的请求，当客户端向服务器发送请求时，我在调试模式下收到以下消息。 “__kernel_vsyscall() at 0xb779e424”没有可用的源代码
我正在开发 linux 操作系统。
【问题讨论】：
-
你覆盖了一些局部变量（main），破坏了堆栈，这将使你正确地回到操作系统。仔细查看你拥有的任何数组。
标签： linux sockets udp kernel system-calls