我正在创建一个外壳,该外壳将模仿Linux中外壳的行为,例如执行ls,mkdir,find等命令,现在我已经使用termios来监听箭头键和按下Enter键,如果用户按下向上箭头键,则向用户显示先前执行的命令。但是在执行完我的shell程序之后,在输入第一个命令后,例如:ls
,将显示命令的输出,但是在那之后,我无法执行另一个命令,因为在终端中键入并按Enter只是在new上打印文本行并且不执行它。
我的代码:
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <term.h>
#include <curses.h>
#include <unistd.h>
static struct termios initial_settings, new_settings;
static int peek_character = -1;
void init_keyboard();
void close_keyboard();
int kbhit();
int readch();
int main() {
int ch;
char str[1000][200];
init_keyboard();
int i = 0;
int j = 0;
while(ch != 'q') {
if(kbhit()) {
ch = readch();
if (ch == 10) {
system(str[i]);
i++;
} else {
str[i][j] = ch;
j++;
}
}
}
close_keyboard();
exit(0);
}
void init_keyboard() {
tcgetattr(0, &initial_settings);
new_settings = initial_settings;
// new_settings.c_iflag &= ~BRKINT;
// new_settings.c_iflag &= ICRNL;
new_settings.c_lflag &= ~ICANON;
new_settings.c_lflag &= ECHO;
new_settings.c_lflag &= ~ISIG;
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VMIN] = 0;
tcsetattr(0, TCSANOW, &new_settings);
}
void close_keyboard() {
tcsetattr(0, TCSANOW, &initial_settings);
}
int kbhit() {
char ch;
int nread;
if (peek_character != -1) {
return 1;
}
new_settings.c_cc[VMIN] = 0;
tcsetattr(0, TCSANOW, &new_settings);
nread = read(0, &ch,1);
new_settings.c_cc[VMIN]=1;
tcsetattr(0, TCSANOW, &new_settings);
if (nread == 1) {
peek_character = ch;
return 1;
}
return 0;
}
int readch() {
char ch;
if (peek_character != -1) {
ch = peek_character;
peek_character = -1;
return ch;
}
read(0, &ch,1);
return ch;
}
您需要fork()创建新的流程,导致system()执行您的命令并离开...试试这个代码: