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关于sync.c中sync_image_load函数中open函数的问题 #2

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WangTingZheng opened this issue Nov 8, 2020 · 0 comments

WangTingZheng commented Nov 8, 2020

请看sync.c中的这一行：

image_fd = open(file_name, O_RDWR , S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); 
if (image_fd <= 0) 
{
	log_err(__FILE__, __LINE__, log_file, "sync_image_load---fd <= 0.");
	return -1;
}

当open函数中的第二个参数有O_CREAT时，第三个参数才会起效，代表第一个参数所指示的文件不存在时，自动创建文件，且文件的权限是第三个参数，您的代码中包含第三个参数，但是第二个参数中未包含O_CREAT，拿按道理第三个参数就没有意义，拿这里填上是为了什么呢，是否有其它方面的考虑呢？

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