2 * Copyright (c) 1998 Adrian Sun (asun@zoology.washington.edu)
3 * All rights reserved. See COPYRIGHT.
5 * this file provides the following functions:
6 * dsi_stream_write: just write a bunch of bytes.
7 * dsi_stream_read: just read a bunch of bytes.
8 * dsi_stream_send: send a DSI header + data.
9 * dsi_stream_receive: read a DSI header + data.
19 #include <sys/types.h>
25 #include <atalk/dsi.h>
26 #include <netatalk/endian.h>
28 #define min(a,b) ((a) < (b) ? (a) : (b))
31 /* write raw data. return actual bytes read. checks against EINTR
32 * aren't necessary if all of the signals have SA_RESTART
34 size_t dsi_stream_write(DSI *dsi, void *data, const size_t length)
40 while (written < length) {
41 if (((len = write(dsi->socket, (u_int8_t *) data + written,
42 length - written)) == -1 && errno == EINTR) ||
47 syslog(LOG_ERR, "dsi_stream_write: %m");
54 dsi->write_count += written;
58 /* read raw data. return actual bytes read. this will wait until
59 * it gets length bytes */
60 size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
66 while (stored < length) {
67 if ((len = read(dsi->socket, (u_int8_t *) data + stored,
68 length - stored)) == -1 && errno == EINTR)
73 else {/* eof or error */
74 syslog(LOG_ERR, "dsi_stream_read(%d): %m", len);
79 dsi->read_count += stored;
84 /* write data. 0 on failure. this assumes that dsi_len will never
85 * cause an overflow in the data buffer. */
86 int dsi_stream_send(DSI *dsi, void *buf, size_t length)
88 char block[DSI_BLOCKSIZ];
96 block[0] = dsi->header.dsi_flags;
97 block[1] = dsi->header.dsi_command;
98 memcpy(block + 2, &dsi->header.dsi_requestID,
99 sizeof(dsi->header.dsi_requestID));
100 memcpy(block + 4, &dsi->header.dsi_code, sizeof(dsi->header.dsi_code));
101 memcpy(block + 8, &dsi->header.dsi_len, sizeof(dsi->header.dsi_len));
102 memcpy(block + 12, &dsi->header.dsi_reserved,
103 sizeof(dsi->header.dsi_reserved));
106 sigprocmask(SIG_BLOCK, &dsi->sigblockset, &oldset);
108 if (!length) { /* just write the header */
109 length = (dsi_stream_write(dsi, block, sizeof(block)) == sizeof(block));
110 sigprocmask(SIG_SETMASK, &oldset, NULL);
111 return length; /* really 0 on failure, 1 on success */
115 iov[0].iov_base = block;
116 iov[0].iov_len = sizeof(block);
117 iov[1].iov_base = buf;
118 iov[1].iov_len = length;
120 towrite = sizeof(block) + length;
121 dsi->write_count += towrite;
122 while (towrite > 0) {
123 if (((len = writev(dsi->socket, iov, 2)) == -1 && errno == EINTR) ||
127 if (len == towrite) /* wrote everything out */
129 else if (len < 0) { /* error */
130 syslog(LOG_ERR, "dsi_stream_send: %m");
131 sigprocmask(SIG_SETMASK, &oldset, NULL);
136 if (towrite > length) { /* skip part of header */
137 iov[0].iov_base = (char *) iov[0].iov_base + len;
138 iov[0].iov_len -= len;
139 } else { /* skip to data */
140 if (iov[0].iov_len) {
141 len -= iov[0].iov_len;
144 iov[1].iov_base = (char *) iov[1].iov_base + len;
145 iov[1].iov_len -= len;
150 /* write the header then data */
151 if ((dsi_stream_write(dsi, block, sizeof(block)) != sizeof(block)) ||
152 (dsi_stream_write(dsi, buf, length) != length)) {
153 sigprocmask(SIG_SETMASK, &oldset, NULL);
158 sigprocmask(SIG_SETMASK, &oldset, NULL);
163 /* read data. function on success. 0 on failure. data length gets
164 * stored in length variable. this should really use size_t's, but
165 * that would require changes elsewhere. */
166 int dsi_stream_receive(DSI *dsi, void *buf, const int ilength,
169 char block[DSI_BLOCKSIZ];
171 /* read in the header */
172 if (dsi_stream_read(dsi, block, sizeof(block)) != sizeof(block))
175 dsi->header.dsi_flags = block[0];
176 dsi->header.dsi_command = block[1];
177 memcpy(&dsi->header.dsi_requestID, block + 2,
178 sizeof(dsi->header.dsi_requestID));
179 memcpy(&dsi->header.dsi_code, block + 4, sizeof(dsi->header.dsi_code));
180 memcpy(&dsi->header.dsi_len, block + 8, sizeof(dsi->header.dsi_len));
181 memcpy(&dsi->header.dsi_reserved, block + 12,
182 sizeof(dsi->header.dsi_reserved));
183 dsi->clientID = ntohs(dsi->header.dsi_requestID);
185 /* make sure we don't over-write our buffers. */
186 *rlength = min(ntohl(dsi->header.dsi_len), ilength);
187 if (dsi_stream_read(dsi, buf, *rlength) != *rlength)