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正确使用 unix 中调用 wget 命令的 exec 命令
原标题:proper use of exec command to call wget in unix

我试图从 c+++ 程序中在 unix 中调用 wget 。 我想在使用叉子后在孩子体内调用它, 我需要使用 exec 而不是系统 () 。 我所做的是

pid_t pID = fork();
if (pID == 0)
{
   execl("/bin/wget","wget", "http://google.gr",(char*)0);
}

and expect to have a html file in the same folder the executable file is, but this does not happen, how should i do it properly?

最佳回答

首先,不要使用 /bin/wget -- wget ,也不会总是安装在 /bin 中;在第一个参数中仅通过 >wget 就会导致搜索APTH。

其次, 您不应该假设 < code> execl 没有返回。 相反, 您应该调用 < code>perror () 来适当记录错误( 然后, 在您的代码中, 退出为非零状态) 。

您也可以在父进程上使用 starce -f 来查看正在发生的情况, 并查找执行程序, 但无论如何, 在您的代码中添加错误处理是正确的事情 。

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