read1.c

来自「unix环境高级编程一书源代码 本书全面介绍了UNIX系统的程序设计界面—系统」· C语言 代码 · 共 29 行

#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 */
}