1 信号函数
代码示例
#include "ourhdr.h"
#include "signal.h"
static void sig_usr(int); /* one handler for both signals */
int
main(void)
{
if (signal(SIGUSR1, sig_usr) == SIG_ERR)
err_sys("can't catch SIGUSR1");
if (signal(SIGUSR2, sig_usr) == SIG_ERR)
err_sys("can't catch SIGUSR2");
for ( ; ; )
pause();
}
static void
sig_usr(int signo) /* argument is signal number */
{
if (signo == SIGUSR1)
printf("received SIGUSR1\n");
else if (signo == SIGUSR2)
printf("received SIGUSR2\n");
else
err_dump("received signal %d\n", signo);
}
运行结果：
[root@rac1 signal]# ./a.out & [1] 10516 [root@rac1 signal]# kill -USR1 10516 received SIGUSR1 [root@rac1 signal]# kill -USR2 10516 [root@rac1 signal]# received SIGUSR2 [root@rac1 signal]# kill 10516 [root@rac1 signal]# [1]+ Terminated ./a.out
