linux socket 进程间通信

unix_stream_ops

af_unix.c 文件 

static const struct file_operations unix_seq_fops = {
.owner = THIS_MODULE,
.open= unix_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_net,
};

static const struct file_operations socket_file_ops = {
    .owner =    THIS_MODULE,
    .llseek =    no_llseek,
    .aio_read =    sock_aio_read,
    .aio_write =    sock_aio_write,
    .poll =        sock_poll,
    .unlocked_ioctl = sock_ioctl,
#ifdef CONFIG_COMPAT
    .compat_ioctl = compat_sock_ioctl,
#endif
    .mmap =        sock_mmap,
    .open =        sock_no_open,    /* special open code to disallow open via /proc */
    .release =    sock_close,
    .fasync =    sock_fasync,
    .sendpage =    sock_sendpage,
    .splice_write = generic_splice_sendpage,
    .splice_read =    sock_splice_read,
};

read write 系统调用：

fs/read_write.c  SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)

include/net/sock.h 

#define SOCK_MIN_SNDBUF 2048
#define SOCK_MIN_RCVBUF 256

socket 缓冲区大小判断设置：

http://blog.sina.com.cn/s/blog_9cffdcab01019m4f.html

参考资料：

http://danier.iteye.com/blog/575158

http://blog.youkuaiyun.com/embeddedfly/article/details/6411714

http://blog.youkuaiyun.com/embeddedfly/article/category/762474

http://blog.youkuaiyun.com/embeddedfly/article/details/6411905   sedmsg