Lighttpd基础篇(七):Chunk.c

//作者：京东瀚览家居官方旗舰店   <--点击关注

//文件名：Chunk.c

/**
 * the network chunk-API
 *
 *
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>

#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>

#include <stdio.h>
#include <errno.h>
#include <string.h>

#include "chunk.h"

/* 初始化并返回一个chunkqueue 结构体指针*/
chunkqueue *chunkqueue_init(void) {
	chunkqueue *cq;

	cq = calloc(1, sizeof(*cq));

	cq->first = NULL;
	cq->last = NULL;

	cq->unused = NULL;

	return cq;
}

/* 初始化并返回一个chunk 结构体指针*/
static chunk *chunk_init(void) {
	chunk *c;

	c = calloc(1, sizeof(*c));

	c->mem = buffer_init();
	c->file.name = buffer_init();
	c->file.fd = -1;
	c->file.mmap.start = MAP_FAILED;   /* */
	c->next = NULL;

	return c;
}

/* 释放一个 chunk 结构体*/
static void chunk_free(chunk *c) {
	if (!c) return;

	buffer_free(c->mem);
	buffer_free(c->file.name);

	free(c);
}

/*  重置一个chunk 结构体*/
static void chunk_reset(chunk *c) {
	if (!c) return;

	buffer_reset(c->mem);

	if (c->file.is_temp && !buffer_is_empty(c->file.name)) {
		unlink(c->file.name->ptr);
	}

	buffer_reset(c->file.name);

	if (c->file.fd != -1) {
		close(c->file.fd);
		c->file.fd = -1;
	}
	if (MAP_FAILED != c->file.mmap.start) {
		munmap(c->file.mmap.start, c->file.mmap.length);
		c->file.mmap.start = MAP_FAILED;
	}
}


/* 释放一个chunkqueue 结构体*/
void chunkqueue_free(chunkqueue *cq) {
	chunk *c, *pc;

	if (!cq) return;

	for (c = cq->first; c; ) {
		pc = c;
		c = c->next;
		chunk_free(pc);
	}