Perl sethostent 函数 - 菜鸟教程

描述

sethostent 应该在第一次调用gethostent之前调用此函数。STAYOPEN参数是可选的，在大多数系统上未使用。当gethostent()检索主机数据库中下一行的信息时，然后sethostent设置（或重置）枚举到主机条目集的开头。

句法

以下是此函数的简单语法-


sethostent STAYOPEN

返回值

此函数不返回任何值。

示例

以下是显示其基本用法的示例代码-

 
while( ($name, $aliases, $addrtype, $length, @addrs) = gethostent() ) {
   print "Name  = $name\n";
   print "Aliases  = $aliases\n";
   print "Addr Type  = $addrtype\n";
   print "Length  = $length\n";
   print "Addrs  = @addrs\n";
}

sethostent(1);

while( ($name, $aliases, $addrtype, $length, @addrs) = gethostent() ) {
   print "Name  = $name\n";
   print "Aliases  = $aliases\n";
   print "Addr Type  = $addrtype\n";
   print "Length  = $length\n";
   print "Addrs  = @addrs\n";
}

endhostent();  # Closes the database;

执行以上代码后，将产生以下结果--


Name  = ip-50-62-147-141.ip.secureserver.net
Aliases  = ip-50-62-147-141 localhost.secureserver.net localhost.localdomain localhost
Addr Type  = 2
Length  = 4
Addrs  = 
Name  = ip-50-62-147-141.ip.secureserver.net
Aliases  = ip-50-62-147-141 localhost.secureserver.net localhost.localdomain localhost
Addr Type  = 2
Length  = 4
Addrs  =