apue 习题6.3

编写一程序，它调用 uname 并输出 utsname 结构中的所有字段，将该输出与uname -a命令的输出结果进行比较。

很简单的一道题

#include "apue.h"
#include <sys/utsname.h>

int
main(void)
{
    struct utsname *name = (struct utsname *)malloc(sizeof(struct utsname));

    if(uname(name) == -1)
        err_sys("uname error");
    printf("sysname = %s\n", name->sysname);
    printf("nodename = %s\n", name->nodename);
    printf("release = %s\n", name->release);
    printf("version = %s\n", name->version);
    printf("machine = %s\n", name->machine);
    exit(0);
}

在电脑运行的输出结果

sysname = Linux
nodename = debian
release = 3.16.0-4-amd64
version = #1 SMP Debian 3.16.7-ckt11-1+deb8u3 (2015-08-04)
machine = x86_64

与uname -a比较

Linux debian 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u3 (2015-08-04) x86_64 GNU/Linux