busybox分析--2.hostname

1.1 hostname代码

cong@msi:/work/test/tcpip/9test$ cat echo.c
#include "utils.h"
#include <sys/utsname.h>
int main ( int argc, char *argv[] )
{
    struct utsname uts;
    uname(&uts);
    dbmsg("sysname=%s",uts.sysname);
    dbmsg("nodename=%s",uts.nodename);
    dbmsg("release=%s",uts.release);
    dbmsg("version=%s",uts.version);
    dbmsg("machine=%s",uts.machine);

    return EXIT_SUCCESS;
}

1.2 结构体及运行结果

#include <sys/utsname.h>
int uname(struct utsname *buf);

struct utsname {
   char sysname[];   // Operating system name (e.g., "Linux")
   char nodename[];  // hostname
   char release[];   // Operating system release (e.g., "2.6.28")
   char version[];   // Operating system version
   char machine[];   // Hardware identifier
};

cong@msi:/work/test/tcpip/9test$ ./echo
echo.c:main[7]: sysname=Linux
echo.c:main[8]: nodename=msi     //这就是hostname的结果
echo.c:main[9]: release=3.13.0-49-generic
echo.c:main[10]: version=#81-Ubuntu SMP Tue Mar 24 19:29:48 UTC 2015
echo.c:main[11]: machine=x86_64

hostname.rar (下载后改名为hostname.tar.gz)