sigusr.c

UNIX编程高级环境（第二版）的信号部分的程序源码

#include    <signal.h>
#include    "ourhdr.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);
    return;
}