zap.c

UNIX环境高级编程第二版（英文版）配书的源代码

#include "apue.h"
#include <fcntl.h>
#include <utime.h>

int
main(int argc, char *argv[])
{
	int				i, fd;
	struct stat		statbuf;
	struct utimbuf	timebuf;

	for (i = 1; i < argc; i++) {
		if (stat(argv[i], &statbuf) < 0) {	/* fetch current times */
			err_ret("%s: stat error", argv[i]);
			continue;
		}
		if ((fd = open(argv[i], O_RDWR | O_TRUNC)) < 0) { /* truncate */
			err_ret("%s: open error", argv[i]);
			continue;
		}
		close(fd);
		timebuf.actime  = statbuf.st_atime;
		timebuf.modtime = statbuf.st_mtime;
		if (utime(argv[i], &timebuf) < 0) {		/* reset times */
			err_ret("%s: utime error", argv[i]);
			continue;
		}
	}
	exit(0);
}