test_fork.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "menu.h"

#define FONTSIZE 10
int PrintMenuOS()
{
    int i, j;
    char data_M[FONTSIZE][FONTSIZE] =
    {
        "          ",
        "  *    *  ",
        " ***  *** ",
        " * *  * * ",
        " * *  * * ",
        " *  **  * ",
        " *      * ",
        " *      * ",
        " *      * ",
        "          "
    };
    char data_e[FONTSIZE][FONTSIZE] =
    {
        "          ",
        "          ",
        "    **    ",
        "   *  *   ",
        "  *    *  ",
        "  ******  ",
        "  *       ",
        "   *      ",
        "    ***   ",
        "          "
    };
    char data_n[FONTSIZE][FONTSIZE] =
    {
        "          ",
        "          ",
        "    **    ",
        "   *  *   ",
        "  *    *  ",
        "  *    *  ",
        "  *    *  ",
        "  *    *  ",
        "  *    *  ",
        "          "
    };
    char data_u[FONTSIZE][FONTSIZE] =
    {
        "          ",
        "          ",
        "  *    *  ",
        "  *    *  ",
        "  *    *  ",
        "  *    *  ",
        "  *    *  ",
        "   *  **  ",
        "    **  * ",
        "          "
    };
    char data_O[FONTSIZE][FONTSIZE] =
    {
        "          ",
        "   ****   ",
        "  *    *  ",
        " *      * ",
        " *      * ",
        " *      * ",
        " *      * ",
        "  *    *  ",
        "   ****   ",
        "          "
    };
    char data_S[FONTSIZE][FONTSIZE] =
    {
        "          ",
        "    ****  ",
        "   **     ",
        "  **      ",
        "   ***    ",
        "     **   ",
        "      **  ",
        "     **   ",
        "  ****    ",
        "          "
    };

    for(i=0; i<FONTSIZE; i++)
    {
        for(j=0; j<FONTSIZE; j++)
        {
            printf("%c", data_M[i][j]);
        }
        for(j=0; j<FONTSIZE; j++)
        {
            printf("%c", data_e[i][j]);
        }
        for(j=0; j<FONTSIZE; j++)
        {
            printf("%c", data_n[i][j]);
        }
        for(j=0; j<FONTSIZE; j++)
        {
            printf("%c", data_u[i][j]);
        }
        for(j=0; j<FONTSIZE; j++)
        {
            printf("%c", data_O[i][j]);
        }
        for(j=0; j<FONTSIZE; j++)
        {
            printf("%c", data_S[i][j]);
        }
        printf("\n");
    }
    return 0;
}

int Quit(int argc, char *argv[])
{
    /* add XXX clean ops */
}

int Time(int argc, char *argv[])
{
    time_t tt;
    struct tm *t;
    tt = time(NULL);
    t = localtime(&tt);
    printf("time:%d:%d:%d:%d:%d:%d\n",t->tm_year+1900, t->tm_mon, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
    return 0;
}

int TimeAsm(int argc, char *argv[])
{
    time_t tt;
    struct tm *t;
    asm volatile(
        "mov $0,%%ebx\n\t"
        "mov $0xd,%%eax\n\t" 
        "int $0x80\n\t" 
        "mov %%eax,%0\n\t"  
        : "=m" (tt) 
    );
    t = localtime(&tt);
    printf("time:%d:%d:%d:%d:%d:%d\n",t->tm_year+1900, t->tm_mon, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
    return 0;
}

int Fork(int argc, char *argv[])
{
	int pid;
	/* fork another process */
	pid = fork();
	if (pid<0) 
	{ 
		/* error occurred */
		fprintf(stderr,"Fork Failed!");
		exit(-1);
	} 
	else if (pid==0) 
	{
		/*	 child process 	*/
    	printf("This is Child Process!\n");
	} 
	else 
	{ 	
		/* 	parent process	 */
    	printf("This is Parent Process!\n");
		/* parent will wait for the child to complete*/
		wait(NULL);
		printf("Child Complete!\n");
	}
}

int main()
{
    PrintMenuOS();
    SetPrompt("MenuOS>>");
    MenuConfig("version","MenuOS V1.0(Based on Linux 3.18.6)",NULL);
    MenuConfig("quit","Quit from MenuOS",Quit);
    MenuConfig("time","Show System Time",Time);
    MenuConfig("time-asm","Show System Time(asm)",TimeAsm);
    MenuConfig("fork","Fork a new process",Fork);
    ExecuteMenu();
}