zap.c

UNIX高级环境编程（第二版）文件系统部分的程序

#include    <sys/types.h>
#include    <sys/stat.h>
#include    <fcntl.h>
#include    <utime.h>
#include    "ourhdr.h"

int
main(int argc, char *argv[])
{
    int                i;
    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 (open(argv[i], O_RDWR | O_TRUNC) < 0) {    /* truncate */
            err_ret("%s: open error", argv[i]);
            continue;
        }
        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);
}