Question

我正在尝试使用POSIX信号处理POSIX定时器。当我尝试执行你可以找到的代码时，我得到：

错误的timer_settime：参数无效

在GAPIL上，基于高级Linux编程和Unix网络编程，我读到这可能发生在new_value.value中你指定了一个负时间值或高于999999999的纳秒数。但我认为我用的参数还可以......

#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/fcntl.h>
#include <sys/wait.h>
#include <stdbool.h>

void termination_handler(int signum)
{
    printf("Timer scaduto\n");
}

int main()
{
    timer_t timer1;
    struct sigevent sigeventStruct;
    sigeventStruct.sigev_notify = SIGEV_SIGNAL;
    sigeventStruct.sigev_signo = 10;
    if(timer_create(_POSIX_MONOTONIC_CLOCK, &sigeventStruct, &timer1) == -1)
    {
        printf( "Errore timer_create: %s\n", strerror( errno ) );
    }
    printf("timer_create eseguito\n");
    struct itimerspec tempoIniziale;
    tempoIniziale.it_value.tv_nsec = 0;

    struct itimerspec tempoFinale;
    tempoFinale.it_value.tv_nsec = 10000000;

    if(timer_settime(timer1, 0, &tempoIniziale, &tempoFinale) == -1)
    {
        printf( "Errore timer_settime: %s\n", strerror( errno ) );
    }





    struct sigaction newSigAzione, oldSigAzione;


    newSigAzione.sa_handler = termination_handler;
    //oldSigAzione.sa_handler = termination_handler;
    sigemptyset (&newSigAzione.sa_mask);

    newSigAzione.sa_flags = 0;


    sigaction (SIGEV_SIGNAL, NULL, &oldSigAzione);
    if(oldSigAzione.sa_handler != SIG_IGN)
    {
        //sigaction (SIGEV_SIGNAL, newSigAzione, NULL);
    }
    /*sigaction (SIGINT, NULL, &oldSigAzione);
    if (oldSigAzione.sa_handler != SIG_IGN)
      sigaction (SIGINT, &newSigAzione, NULL);
    sigaction (SIGHUP, NULL, &oldSigAzione);
    if (oldSigAzione.sa_handler != SIG_IGN)
      sigaction (SIGHUP, &newSigAzione, NULL);
    sigaction (SIGTERM, NULL, &oldSigAzione);
    if (oldSigAzione.sa_handler != SIG_IGN)
      sigaction (SIGTERM, &newSigAzione, NULL);*/

    /*sigaction (SIGTERM, &newSigAzione, NULL);*/

    return 0;
}

Answer 1

_POSIX_MONOTONIC_CLOCK是一个功能测试宏，可以告诉您系统上是否有单调时钟。

您可以在Linux上传递给timer_create（）的可用时钟ID是：

CLOCK_REALTIME
  System-wide realtime clock. Setting this clock requires appropriate privileges.
CLOCK_MONOTONIC
  Clock that cannot be set and represents monotonic time since some unspecified starting point.
CLOCK_PROCESS_CPUTIME_ID
  High-resolution per-process timer from the CPU.
CLOCK_THREAD_CPUTIME_ID
  Thread-specific CPU-time clock.

您还必须初始化struct sigevent和struct itimerspec中的所有成员。例如。你没有在structitimer_spec中设置.tv_sec，只设置.tv_nsec，这会在这些成员中产生垃圾值。

...
memset(&sigeventStruct, 0, sizeof sigeventStruct);
...
and 
struct itimerspec tempoFinale;
memset(&tempoFinale, 0, sizeof tempoFinale);
tempoFinale.it_value.tv_nsec = 10000000;

struct itimerspec as timer_create的参数无效参数

1 个答案: