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If the iucv message limit for a communication path is exceeded, sendmsg() returns -EAGAIN instead of -EPIPE. The calling application can then handle this error situtation, e.g. to try again after waiting some time. For blocking sockets, sendmsg() waits up to the socket timeout before returning -EAGAIN. For the new wait condition, a macro has been introduced and the iucv_sock_wait_state() has been refactored to this macro. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/*
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* Copyright 2006 IBM Corporation
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* IUCV protocol stack for Linux on zSeries
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* Version 1.0
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* Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
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*
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*/
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#ifndef __AFIUCV_H
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#define __AFIUCV_H
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#include <asm/types.h>
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#include <asm/byteorder.h>
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#include <linux/list.h>
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#include <linux/poll.h>
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#include <linux/socket.h>
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#ifndef AF_IUCV
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#define AF_IUCV 32
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#define PF_IUCV AF_IUCV
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#endif
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/* Connection and socket states */
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enum {
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IUCV_CONNECTED = 1,
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IUCV_OPEN,
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IUCV_BOUND,
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IUCV_LISTEN,
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IUCV_SEVERED,
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IUCV_DISCONN,
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IUCV_CLOSING,
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IUCV_CLOSED
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};
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#define IUCV_QUEUELEN_DEFAULT 65535
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#define IUCV_CONN_TIMEOUT (HZ * 40)
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#define IUCV_DISCONN_TIMEOUT (HZ * 2)
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#define IUCV_CONN_IDLE_TIMEOUT (HZ * 60)
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#define IUCV_BUFSIZE_DEFAULT 32768
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/* IUCV socket address */
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struct sockaddr_iucv {
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sa_family_t siucv_family;
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unsigned short siucv_port; /* Reserved */
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unsigned int siucv_addr; /* Reserved */
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char siucv_nodeid[8]; /* Reserved */
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char siucv_user_id[8]; /* Guest User Id */
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char siucv_name[8]; /* Application Name */
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};
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/* Common socket structures and functions */
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struct sock_msg_q {
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struct iucv_path *path;
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struct iucv_message msg;
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struct list_head list;
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spinlock_t lock;
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};
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#define iucv_sk(__sk) ((struct iucv_sock *) __sk)
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struct iucv_sock {
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struct sock sk;
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char src_user_id[8];
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char src_name[8];
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char dst_user_id[8];
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char dst_name[8];
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struct list_head accept_q;
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spinlock_t accept_q_lock;
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struct sock *parent;
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struct iucv_path *path;
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struct sk_buff_head send_skb_q;
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struct sk_buff_head backlog_skb_q;
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struct sock_msg_q message_q;
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unsigned int send_tag;
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u8 flags;
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u16 msglimit;
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};
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/* iucv socket options (SOL_IUCV) */
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#define SO_IPRMDATA_MSG 0x0080 /* send/recv IPRM_DATA msgs */
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#define SO_MSGLIMIT 0x1000 /* get/set IUCV MSGLIMIT */
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/* iucv related control messages (scm) */
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#define SCM_IUCV_TRGCLS 0x0001 /* target class control message */
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struct iucv_sock_list {
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struct hlist_head head;
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rwlock_t lock;
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atomic_t autobind_name;
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};
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unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
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poll_table *wait);
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void iucv_sock_link(struct iucv_sock_list *l, struct sock *s);
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void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *s);
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int iucv_sock_wait_cnt(struct sock *sk, unsigned long timeo);
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void iucv_accept_enqueue(struct sock *parent, struct sock *sk);
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void iucv_accept_unlink(struct sock *sk);
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struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock);
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#endif /* __IUCV_H */
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