I'm trying to figure out how to use pseudo-terminal's in linux, essentially I want to create a telnetd clone, something I mentioned in an earlier question.
我试图弄清楚如何在linux中使用伪终端，基本上我想创建一个telnetd克隆，我之前在一个问题中提到过。
I understand the concept of master and slave terminal, and I have a basic grasp on how to use syscalls in C.
我理解主从终端的概念，我对如何在C中使用系统调用有了基本的把握。
My question concerns the next step after opening a slave / master file descriptor. How to I launch getty in the slave? Are there any good resources on the net for using the forkpty(), openpty(),or another API?
我的问题涉及打开slave / master文件描述符后的下一步。如何在奴隶中启动getty？网上是否有使用forkpty（），openpty（）或其他API的好资源？
Some examples in C would help. This was a very similar question, but no one really provided any examples.
C中的一些例子会有所帮助。这是一个非常相似的问题，但没有人真正提供任何例子。
3 个解决方案
#1
9
Advanced Programming in the Unix Environment, 2nd Edition has a superb chapter on the pseudo-terminal layer available in Linux. The best part is the source code which contains a pty driver and very clearly demonstrates how to use the pty interfaces. (The pty program it builds is useful in its own right if you want to drive a terminal-only program programmatically but don't wish to use expect(1).)
Unix环境中的高级编程，第2版对Linux中可用的伪终端层有一个很好的章节。最好的部分是包含pty驱动程序的源代码，并且非常清楚地演示了如何使用pty接口。 （如果你想以编程方式驱动一个仅限终端的程序但不希望使用expect（1），它构建的pty程序本身就很有用。）
#2
3
include
#include <sys/stat.h>
#include <fcntl.h>
#define _XOPEN_SOURCE
#include <stdlib.h>
int main(int argc, char **argv)
{
char *slavename;
int masterfd;
masterfd = open("/dev/ptmx", O_RDWR);
grantpt(masterfd);
unlockpt(masterfd);
slavename = ptsname(masterfd);
...
}
I posted simple example of demonstrating pseudo terminal master slave concept. please go through this link to get clear understanding of terminals in Linux http://www.linusakesson.net/programming/tty/
我发布了演示伪终端主从概念的简单示例。请通过此链接了解Linux中的终端http://www.linusakesson.net/programming/tty/
#3
0
You don't lauch a getty for ptys. The getty is only the "listener" part of the process. For hardwired terminals, each individual terminal-device is "listening" constantly. For telnet, the daemon does the listening part(on a socket), and handles connection request by creating a pty pair, and fork()ing / exec()ing. And indeed: APUE handles ptys very well.
你不喜欢ptys。 getty只是该过程的“倾听者”部分。对于硬连线终端，每个终端设备都在不断“收听”。对于telnet，守护进程执行侦听部分（在套接字上），并通过创建pty对和fork（）ing / exec（）来处理连接请求。事实上：APUE很好地处理了ptys。
#1
9
Advanced Programming in the Unix Environment, 2nd Edition has a superb chapter on the pseudo-terminal layer available in Linux. The best part is the source code which contains a pty driver and very clearly demonstrates how to use the pty interfaces. (The pty program it builds is useful in its own right if you want to drive a terminal-only program programmatically but don't wish to use expect(1).)
Unix环境中的高级编程，第2版对Linux中可用的伪终端层有一个很好的章节。最好的部分是包含pty驱动程序的源代码，并且非常清楚地演示了如何使用pty接口。 （如果你想以编程方式驱动一个仅限终端的程序但不希望使用expect（1），它构建的pty程序本身就很有用。）
#2
3
include
#include <sys/stat.h>
#include <fcntl.h>
#define _XOPEN_SOURCE
#include <stdlib.h>
int main(int argc, char **argv)
{
char *slavename;
int masterfd;
masterfd = open("/dev/ptmx", O_RDWR);
grantpt(masterfd);
unlockpt(masterfd);
slavename = ptsname(masterfd);
...
}
I posted simple example of demonstrating pseudo terminal master slave concept. please go through this link to get clear understanding of terminals in Linux http://www.linusakesson.net/programming/tty/
我发布了演示伪终端主从概念的简单示例。请通过此链接了解Linux中的终端http://www.linusakesson.net/programming/tty/
#3
0
You don't lauch a getty for ptys. The getty is only the "listener" part of the process. For hardwired terminals, each individual terminal-device is "listening" constantly. For telnet, the daemon does the listening part(on a socket), and handles connection request by creating a pty pair, and fork()ing / exec()ing. And indeed: APUE handles ptys very well.
你不喜欢ptys。 getty只是该过程的“倾听者”部分。对于硬连线终端，每个终端设备都在不断“收听”。对于telnet，守护进程执行侦听部分（在套接字上），并通过创建pty对和fork（）ing / exec（）来处理连接请求。事实上：APUE很好地处理了ptys。