1/* 2 * $Id: dsi_attn.c,v 1.8 2009-10-25 06:13:11 didg Exp $ 3 * 4 * Copyright (c) 1997 Adrian Sun (asun@zoology.washington.edu) 5 * All rights reserved. See COPYRIGHT. 6 */ 7 8#ifdef HAVE_CONFIG_H 9#include "config.h" 10#endif /* HAVE_CONFIG_H */ 11 12#include <stdio.h> 13#include <string.h> 14#include <signal.h> 15#include <sys/types.h> 16 17#include <atalk/dsi.h> 18#include <atalk/afp.h> 19#include <netatalk/endian.h> 20 21#ifndef MIN 22#define MIN(a,b) ((a) < (b) ? (a) : (b)) 23#endif /* MIN */ 24 25/* send an attention. this may get called at any time, so we can't use 26 * DSI buffers to send one. 27 return 0 on error 28 29 */ 30int dsi_attention(DSI *dsi, AFPUserBytes flags) 31{ 32 /* header + AFPUserBytes */ 33 char block[DSI_BLOCKSIZ + sizeof(AFPUserBytes)]; 34 u_int32_t len, nlen; 35 u_int16_t id; 36 37 if (dsi->flags & DSI_SLEEPING) 38 return 1; 39 40 if (dsi->in_write) { 41 return -1; 42 } 43 id = htons(dsi_serverID(dsi)); 44 flags = htons(flags); 45 len = MIN(sizeof(flags), dsi->attn_quantum); 46 nlen = htonl(len); 47 48 memset(block, 0, sizeof(block)); 49 block[0] = DSIFL_REQUEST; /* sending a request */ 50 block[1] = DSIFUNC_ATTN; /* it's an attention */ 51 memcpy(block + 2, &id, sizeof(id)); 52 /* code = 0 */ 53 memcpy(block + 8, &nlen, sizeof(nlen)); 54 memcpy(block + 16, &flags, sizeof(flags)); 55 /* reserved = 0 */ 56 57 /* send an attention */ 58 return dsi_stream_write(dsi, block, DSI_BLOCKSIZ + len, DSI_NOWAIT); 59} 60