file_table.c

来自「一个用于学习的操作系统」· C语言 代码 · 共 27 行

/*
 *  linux/fs/file_table.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <fairysky/fs.h>
#include <fairysky/string.h>

struct file file_table[NR_FILE] = {};

struct file * get_empty_file_pointer(void)
{
    int i;
    struct file * f = file_table;

    for (i = 0; i++ < NR_FILE; ++f) {
        if (! f->f_count) {
            memset(f, 0, sizeof(*f));
            f->f_count = 1;
            return f;
        }
    }
    return NULL;
}