C语言 在子线程setsid()后执行exevp(ssh,...)怎样不自动打开ssh-askpass

Question

问题描述

用C语言 在子线程setsid()后执行execvp(arglist[0], arglist);。如果没有安装ssh-askpass则提示

ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
Permission denied, please try again.
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
Permission denied, please try again.
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
root@192.168.1.1: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).

如果安装了则会自动启动ssh-askpass，要求输入密码。

怎样才能实现不启动启动ssh-askpass, 而是直接在命令行中输入ssh密码？而且注释掉setsid();会发现是不会启动ssh-askpass的。

环境

系统版本 Fedora 28
openssh版本 OpenSSH_7.8p1, OpenSSL 1.1.0h-fips 27 Mar 2018

相关代码

int main() {
    int pid;
    if ((pid = fork()) == 0) {
        printf("child");
        setsid();
        execlp("ssh", "ssh", "192.168.1.1", NULL);
    }
}