A question about utime

#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) {err_ret("%s: stat error", argv[i]);continue;}if ((fd = open(argv[i], O_RDWR|O_TRUNC)) < 0) {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) {err_ret("%s: utime error", argv[i]);continue;}}exit(0);}

 

question:

      [ma@localhost ma]$ ls -l unlink.c
      -rw-r--r--    1 ma  ma         0  3月 26 03:06 unlink.c
      [ma@localhost ma]$ ls -lu unlink.c
      -rw-r--r--    1 ma  ma         0  3月 26 03:18 unlink.c
      [ma@localhost ma]$ ls -lc unlink.c
      -rw-r--r--    1 ma  ma         0  3月 26 03:18 unlink.c

    

      [ma@localhost ma]$ ./test unlink.c

      [ma@localhost ma]$ ls -l unlink.c
      -rw-r--r--    1 ma  ma         0  3月 26 03:06 unlink.c
      [ma@localhost ma]$ ls -lu unlink.c
      -rw-r--r--    1 ma  ma         0  3月 26 03:21 unlink.c
      [ma@localhost ma]$ ls -lc unlink.c
      -rw-r--r--    1 ma  ma         0  3月 26 03:21 unlink.c
     

      access time (ls -lu) is also changed, according to the code, it should not be changed,