Hello erveryone I get an not defined reference error everytime i complie my code.
Here is the code:
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#define MESSWERTTIMER (SIGRTMAX)
#define MESSREIHENTIMER (SIGRTMAX-1)
static void handler(int signo, siginfo_t *siginfo, void *context){
if(signo==MESSWERTTIMER){
}else if(signo==MESSREIHENTIMER){
}else if(signo ==SIGINT){
//timer_delete(timerid2);
//timer_delete(timerid1);
puts("Messwerte anzeigen");
perror("CTRL+C cached!\n");
exit(1);
}
}
//eventuell zwei sigevents zwei timer!!!!!!!
int main(void){
struct sigaction siga;
struct sigevent sigev1,sigev2;
struct itimerspec tspec,tspec2;
timer_t timerid1,timerid2;
sigset_t mask;
memset(&siga,0,sizeof(siga));
sigemptyset(&siga.sa_mask);
siga.sa_flags=SA_SIGINFO;
siga.sa_sigaction = &handler;
if(sigaction(MESSWERTTIMER,&siga,NULL)==-1){
perror("sigaction for MESSWERTTIMER failed horribly\n");
exit(EXIT_FAILURE);
}
if(sigaction(MESSREIHENTIMER,&siga,NULL)==-1){
perror("sigaction for MESSREIHENTIMER failed horribly\n");
exit(EXIT_FAILURE);
}
sigaction(SIGINT,&siga,NULL);
//blocking timer signals temporarily
printf("blocking signals for a short time\n");
sigemptyset(&mask);
sigaddset(&mask,MESSWERTTIMER);
sigaddset(&mask,MESSREIHENTIMER);
if(sigprocmask(SIG_SETMASK,&mask,NULL)==-1){
perror("sigprocmask\n");
exit(EXIT_FAILURE);
}
//creating timers
sigev1.sigev_notify=SIGEV_SIGNAL;
sigev1.sigev_signo=MESSWERTTIMER;
sigev1.sigev_value.sival_ptr= &timerid1;
sigev2.sigev_notify=SIGEV_SIGNAL;
sigev2.sigev_signo=MESSREIHENTIMER;
sigev2.sigev_value.sival_ptr= &timerid2;
if(timer_create(CLOCK_REALTIME,&sigev1,&timerid1)==-1){
perror("timer create 1\n");
exit(EXIT_FAILURE);
}
if(timer_create(CLOCK_REALTIME,&sigev2,&timerid2)==-1){
perror("timer create 2\n");
exit(EXIT_FAILURE);
}
tspec.it_value.tv_sec =0 ;
tspec.it_value.tv_nsec= 100000;
tspec.it_interval.tv_sec= tspec.it_value.tv_sec;
tspec.it_interval.tv_nsec= tspec.it_value.tv_nsec;
tspec2.it_value.tv_sec = 1;
tspec2.it_value.tv_nsec= 10000;
tspec2.it_interval.tv_sec= tspec2.it_value.tv_sec;
tspec2.it_interval.tv_nsec= tspec2.it_value.tv_nsec;
//unblocking signals
if(sigprocmask(SIG_UNBLOCK,&mask,NULL)==-1){
perror("sigprocmask unblock\n");
exit(EXIT_FAILURE);
}
if(timer_settime(timerid1,0,&tspec,NULL)==-1){
perror("settime 1\n");
exit(EXIT_FAILURE);
}
if(timer_settime(timerid2,0,&tspec2,NULL)==-1){
perror("settime 2\n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
my handler is not done yet, so don`t mind it.
Makefile:
nr1: nr1.c
gcc -Wall nr1.c -o nr1
clean:
rm -rf nr1
And here the compiler message, I hope you don`t mind it is in german:
gcc -Wall nr1.c -o nr1
nr1.c:9:1: warning: "/*" within comment [-Wcomment]
/****************************************************************************/
^
/tmp/ccnoBsjh.o: In Funktion `main':
nr1.c:(.text+0x1f9): Nicht definierter Verweis auf `timer_create'
nr1.c:(.text+0x22d): Nicht definierter Verweis auf `timer_create'
nr1.c:(.text+0x2fc): Nicht definierter Verweis auf `timer_settime'
nr1.c:(.text+0x335): Nicht definierter Verweis auf `timer_settime'
collect2: error: ld returned 1 exit status
make: *** [nr1] Fehler 1
I looked through the board and couldn`t find a matching solution. So Iḿ hoping, that you can help me.
