p4-11.c

SUN Solaris8平台下进程间通信

#include <sys/types.h>
#include <utime.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "err_exit.h"
int main(int argc, char *argv[])
{
    int i;
    struct  stat statbuf;
    struct utimbuf times;
    if (argc != 2) {
       printf("Usage: a.out filename\n");
       exit(1);
    }
    if (stat(argv[1],&statbuf) < 0)       /* 获得文件的当前时间 */
       err_exit(argv[1]);
if (open(argv[1],O_RDWR|O_TRUNC) < 0)      /* 截断文件 */
       err_exit(argv[1]);
    printf("%s is truncated now.\n", argv[1] );
    times.actime = statbuf.st_atime;          /* 恢复文件时间至原时间 */
    times.modtime = statbuf.st_mtime;   
    if (utime(argv[1], &times) == 0)            
       printf ("utime() call successful\n");
    else
       printf ("ERROR: utime() call failed. %s\n",strerror(errno));
    exit(0);
}