kopia lustrzana https://github.com/FreeSpacenav/spnavcfg
135 wiersze
2.6 KiB
C
135 wiersze
2.6 KiB
C
/*
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spnavcfg - an interactive GUI configurator for the spacenavd daemon.
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Copyright (C) 2007 John Tsiombikas <nuclear@siggraph.org>
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <errno.h>
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#include <ctype.h>
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#include <unistd.h>
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#include "cfgfile.h"
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#include "cmd.h"
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#define CFGFILE "/etc/spnavrc"
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int get_daemon_pid(void);
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static int update_cfg(void);
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static void sig(int s);
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static struct cfg cfg;
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static int dpid = -1;
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int backend(int pfd)
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{
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signal(SIGTERM, sig);
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for(;;) {
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ssize_t res;
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int cmd;
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/* get command */
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if(read(pfd, &cmd, 1) == -1 && errno != EINTR) {
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perror("pipe read blew up in my face! wtf");
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return -1;
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}
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switch(cmd) {
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case CMD_PING:
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kill(getppid(), ((dpid = get_daemon_pid()) == -1) ? SIGUSR2 : SIGUSR1);
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break;
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case CMD_CFG:
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{
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char *buf = (char*)&cfg;
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int sz = sizeof cfg;
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while(sz && (res = read(pfd, buf, sz)) > 0) {
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buf += res;
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sz -= res;
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}
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update_cfg();
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}
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break;
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case CMD_STARTX:
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case CMD_STOPX:
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if(dpid == -1) {
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if((dpid = get_daemon_pid()) == -1) {
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return -1;
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}
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}
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if(kill(dpid, cmd == CMD_STARTX ? SIGUSR1 : SIGUSR2) == -1) {
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if(errno != EPERM) {
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dpid = -1;
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kill(getppid(), SIGUSR2);
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}
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}
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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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return 0;
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}
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int get_daemon_pid(void)
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{
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FILE *fp;
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char buf[64];
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if(!(fp = fopen("/tmp/.spnavd.pid", "r"))) {
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fprintf(stderr, "no spacenav pid file, can't find daemon\n");
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return -1;
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}
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fgets(buf, sizeof buf, fp);
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fclose(fp);
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if(!isdigit(buf[0])) {
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fprintf(stderr, "fucked up pidfile, can't find daemon\n");
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return -1;
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}
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return atoi(buf);
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}
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static int update_cfg(void)
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{
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if(write_cfg(CFGFILE, &cfg) == -1) {
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return -1;
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}
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if(dpid == -1) {
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if((dpid = get_daemon_pid()) == -1) {
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return -1;
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}
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}
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if(kill(dpid, SIGHUP) == -1 && errno != EPERM) {
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dpid = -1; /* invalidate pid, will be searched again next time */
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return -1;
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}
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return 0;
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}
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static void sig(int s)
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{
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_exit(0);
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}
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