getuser.c

dos的实模式下实现多任务处理的演示。（转载）

/**
    PC-MOS/386 Ver. 3.0 Interface Functions
    Copyright (C) 1988, 1989 More Custom Software. All rights reserved.
    Written in Microsoft C ver. 5.1
    Copyright Microsoft Corporation, 1984-1987. All rights reserved.

    - Description -
    If available, will return 'user' signed on in the specified
    'task'.

    - Return -
    'User' signed on if available.
    Empty string if noone signed on.

    - Note -
    'user' string must be a minimum of five characters.
    if 'task' == -1, current task will be used.

**/
#include <mos.h>

char *get_user(task, user)
int task;
char *user;
{
    register int x;
    char far *tcb;

    if (ismos()) {
	tcb = get_tcb(task);
	for(x = 0; x != 4; x++)
	    *(user + x) = *(tcb + x + 123);
	*(user + 4) = '\0';
	return(user);
    } else
	return((char *)0);
}