p12-4.c

SUN Solaris8平台下进程间通信

#include <sys/utsname.h>
#include <unistd.h>
#include <stdio.h>
#include "err_exit.h"
int main(void)
{
    union{
        short inum;
        char c[sizeof(short)];
    }un;
struct utsname uts;
un.inum = 0x0102;
    /* 打印出CPU名、操作系统及其版本号 */
    if(uname(&uts) < 0) 
       err_exit("Could not get host information\n");
    printf(" %s-%s-%s：", uts.machine, uts.sysname, uts.release);
    /* 检测字节顺序 */
    if(sizeof(short) != 2){
       printf("sizeof short =%d\n",sizeof(short));
       exit(0);
    }
    if(un.c[0] == 1 && un.c[1] == 2)
       printf("big_endian\n");
    else if(un.c[0] == 2 && un.c[1] == 1)
       printf("little_endian\n");
    else
       printf("unknown\n");
    exit(0);
}