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[CONNECTOR]: Add userspace example code into Documentation/connector/
I was asked several times to include userspace example code into Documentation, so if there is no policy against it, consider attached patch for 2.6.18. This program works with included Documentation/connector/cn_test.c connector module. Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Evgeniy Polyakov
David S. Miller
parent
94918ff68a
commit
897522ea1c
206
Documentation/connector/ucon.c
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206
Documentation/connector/ucon.c
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/*
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* ucon.c
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*
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* Copyright (c) 2004+ Evgeniy Polyakov <johnpol@2ka.mipt.ru>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <asm/types.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/poll.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include <linux/connector.h>
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#define DEBUG
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#define NETLINK_CONNECTOR 11
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#ifdef DEBUG
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#define ulog(f, a...) fprintf(stdout, f, ##a)
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#else
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#define ulog(f, a...) do {} while (0)
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#endif
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static int need_exit;
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static __u32 seq;
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static int netlink_send(int s, struct cn_msg *msg)
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{
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struct nlmsghdr *nlh;
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unsigned int size;
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int err;
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char buf[128];
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struct cn_msg *m;
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size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
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nlh = (struct nlmsghdr *)buf;
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nlh->nlmsg_seq = seq++;
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nlh->nlmsg_pid = getpid();
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nlh->nlmsg_type = NLMSG_DONE;
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nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
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nlh->nlmsg_flags = 0;
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m = NLMSG_DATA(nlh);
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#if 0
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ulog("%s: [%08x.%08x] len=%u, seq=%u, ack=%u.\n",
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__func__, msg->id.idx, msg->id.val, msg->len, msg->seq, msg->ack);
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#endif
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memcpy(m, msg, sizeof(*m) + msg->len);
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err = send(s, nlh, size, 0);
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if (err == -1)
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ulog("Failed to send: %s [%d].\n",
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strerror(errno), errno);
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return err;
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}
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int main(int argc, char *argv[])
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{
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int s;
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char buf[1024];
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int len;
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struct nlmsghdr *reply;
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struct sockaddr_nl l_local;
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struct cn_msg *data;
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FILE *out;
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time_t tm;
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struct pollfd pfd;
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if (argc < 2)
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out = stdout;
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else {
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out = fopen(argv[1], "a+");
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if (!out) {
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ulog("Unable to open %s for writing: %s\n",
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argv[1], strerror(errno));
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out = stdout;
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}
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}
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memset(buf, 0, sizeof(buf));
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s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
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if (s == -1) {
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perror("socket");
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return -1;
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}
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l_local.nl_family = AF_NETLINK;
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l_local.nl_groups = 0x123; /* bitmask of requested groups */
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l_local.nl_pid = 0;
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if (bind(s, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1) {
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perror("bind");
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close(s);
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return -1;
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}
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#if 0
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{
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int on = 0x57; /* Additional group number */
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setsockopt(s, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &on, sizeof(on));
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}
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#endif
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if (0) {
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int i, j;
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memset(buf, 0, sizeof(buf));
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data = (struct cn_msg *)buf;
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data->id.idx = 0x123;
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data->id.val = 0x456;
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data->seq = seq++;
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data->ack = 0;
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data->len = 0;
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for (j=0; j<10; ++j) {
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for (i=0; i<1000; ++i) {
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len = netlink_send(s, data);
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}
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ulog("%d messages have been sent to %08x.%08x.\n", i, data->id.idx, data->id.val);
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}
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return 0;
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}
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pfd.fd = s;
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while (!need_exit) {
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pfd.events = POLLIN;
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pfd.revents = 0;
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switch (poll(&pfd, 1, -1)) {
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case 0:
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need_exit = 1;
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break;
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case -1:
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if (errno != EINTR) {
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need_exit = 1;
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break;
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}
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continue;
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}
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if (need_exit)
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break;
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memset(buf, 0, sizeof(buf));
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len = recv(s, buf, sizeof(buf), 0);
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if (len == -1) {
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perror("recv buf");
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close(s);
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return -1;
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}
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reply = (struct nlmsghdr *)buf;
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switch (reply->nlmsg_type) {
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case NLMSG_ERROR:
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fprintf(out, "Error message received.\n");
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fflush(out);
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break;
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case NLMSG_DONE:
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data = (struct cn_msg *)NLMSG_DATA(reply);
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time(&tm);
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fprintf(out, "%.24s : [%x.%x] [%08u.%08u].\n",
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ctime(&tm), data->id.idx, data->id.val, data->seq, data->ack);
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fflush(out);
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break;
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default:
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break;
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}
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}
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close(s);
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return 0;
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}
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