问题描述
我试图POSIX计时器togheter与POSIX信号处理。
当我尝试excecute的code，你可以找到downhere，我得到：
Errore timer_settime：无效的参数
在GAPIL书，那是基于高级Linux编程和Unix网络编程，我读到这可能发生new_value.value您指定一个负的时间值或纳秒数比999999999更高内部时。
但我认为，我已经使用的参数是可以的...
的#include＆LT;＆string.h中GT;
＃包括LT＆;＆stdio.h中GT;
＃包括LT＆;＆fcntl.h GT;
＃包括LT＆;＆time.h中GT;
＃包括LT＆;＆stdlib.h中GT;
＃包括LT＆;＆errno.h中GT;
＃包括LT＆;＆unistd.h中GT;
＃包括LT＆;＆signal.h中GT;
＃包括LT＆; SYS / types.h中＆GT;
＃包括LT＆; SYS / socket.h中＆GT;
＃包括LT＆; ARPA / inet.h＆GT;
＃包括LT＆; netinet / in.h中＆GT;
＃包括LT＆;＆netdb.h中GT;
＃包括LT＆; SYS / fcntl.h＆GT;
＃包括LT＆; SYS / wait.h＆GT;
＃包括LT＆;＆stdbool.h GT;无效termination_handler（INT正负号）
{
的printf（计时器斯卡杜托\\ n）;
}诠释的main（）
{
timer_t定时器1;
结构的sigevent sigeventStruct;
sigeventStruct.sigev_notify = SIGEV_SIGNAL;
sigeventStruct.sigev_signo = 10;
如果（timer_create（_POSIX_MONOTONIC_CLOCK，＆安培; sigeventStruct，＆安培;定时器1）== -1）
{
的printf（Errore timer_create：％S \\ n字符串错误（错误））;
}
的printf（timer_create eseguito \\ n）;
结构itimerspec tempoIniziale;
tempoIniziale.it_value.tv_nsec = 0; 结构itimerspec tempoFinale;
tempoFinale.it_value.tv_nsec =千万; 如果（timer_settime（定时器1，0，＆安培; tempoIniziale，＆安培; tempoFinale）== -1）
{
的printf（Errore timer_settime：％S \\ n字符串错误（错误））;
} 结构sigaction的newSigAzione，oldSigAzione;
newSigAzione.sa_handler = termination_handler;
//oldSigAzione.sa_handler = termination_handler;
sigemptyset（安培; newSigAzione.sa_mask）; newSigAzione.sa_flags = 0;
的sigaction（SIGEV_SIGNAL，NULL，＆安培; oldSigAzione）;
如果（oldSigAzione.sa_handler！= SIG_IGN）
{
//的sigaction（SIGEV_SIGNAL，newSigAzione，NULL）;
}
/ *的sigaction（SIGINT，NULL，＆安培; oldSigAzione）;
如果（oldSigAzione.sa_handler！= SIG_IGN）
的sigaction（SIGINT，和放大器; newSigAzione，NULL）;
的sigaction（SIGHUP，NULL，＆安培; oldSigAzione）;
如果（oldSigAzione.sa_handler！= SIG_IGN）
的sigaction（SIGHUP，＆安培; newSigAzione，NULL）;
的sigaction（SIGTERM，NULL，＆安培; oldSigAzione）;
如果（oldSigAzione.sa_handler！= SIG_IGN）
的sigaction（SIGTERM，＆安培; newSigAzione，NULL）; * / / *的sigaction（SIGTERM，＆安培; newSigAzione，NULL）; * / 返回0;
}
_POSIX_MONOTONIC_CLOCK是一个功能测试宏告诉你单调时钟是否可用在系统上。
可用的时钟IDS你可以通过在Linux上timer_create（）是：
CLOCK_REALTIME
全系统实时时钟。设置此时钟要求相应的权限。
CLOCK_MONOTONIC
不能设置时钟和再presents因为一些不确定的起点单调的时间。
CLOCK_PROCESS_CPUTIME_ID
高分辨率每进程计时器从CPU。
CLOCK_THREAD_CPUTIME_ID
线程特定的CPU时钟。
您还必须初始化所有在结构的sigevent 成员和结构itimerspec 。
例如。您没有设置 .tv_sec 在structitimer_spec，只有 .tv_nsec ，这导致在这些成员垃圾值。
...
memset的（安培; sigeventStruct，0，sizeof的sigeventStruct）;
...
和
结构itimerspec tempoFinale;
memset的（安培; tempoFinale，0，sizeof的tempoFinale）;
tempoFinale.it_value.tv_nsec =千万;
I was trying POSIX timers togheter with POSIX signals handling.When I try to excecute the code you can find downhere, I get:
Errore timer_settime: Invalid argument
On GAPIL book, that is based upon Advanced Linux Programming and Unix network programming, I read that this can happen when inside new_value.value you specified a negative time value or a number of nanoseconds higher than 999999999.But I think that parameters I have used are okay...
#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;
}
_POSIX_MONOTONIC_CLOCK is a feature test macro that tells you whether monotonic clocks are available on the system.
The available clock ids you can pass to timer_create() on Linux are:
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.
You must also initialize all the members in struct sigevent and struct itimerspec. E.g. you don't set .tv_sec in the structitimer_spec, only .tv_nsec , which results in garbage values in those members.
...
memset(&sigeventStruct, 0, sizeof sigeventStruct);
...
and
struct itimerspec tempoFinale;
memset(&tempoFinale, 0, sizeof tempoFinale);
tempoFinale.it_value.tv_nsec = 10000000;
这篇关于结构体itimerspec为timer_create的参数无效的参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！