read1.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_alrm(int);

int
main(void)
{
    int        n;
    char    line[MAXLINE];

    if (signal(SIGALRM, sig_alrm) == SIG_ERR)
        err_sys("signal(SIGALRM) error");
    alarm(10);
    if ( (n = read(STDIN_FILENO, line, MAXLINE)) < 0)
        err_sys("read error");
    alarm(0);

    write(STDOUT_FILENO, line, n);

    exit(0);
}

static void
sig_alrm(int signo)
{
    return;    /* nothing to do, just return to interrupt the read */
}