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136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/*
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* Yet another daemon library especially designed to be used
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* with libsxmp based daemons.
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*
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* (c) Alexander Vdolainen 2016 <avdolainen@zoho.com>
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*
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* libsxmp is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by 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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*
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* libsxmp is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser 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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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <pthread.h>
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#include <ctype.h>
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#include <dlfcn.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <tdata/usrtc.h>
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#include <sexpr/sexp.h>
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#include <ydaemon/ydaemon.h>
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int yd_mainloop(yd_context_t *ctx)
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{
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usrtc_node_t *node = NULL;
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yd_mod_t *mod;
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/* we will locked here */
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pthread_mutex_lock(&ctx->looplock);
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/* if we're here ... somebody decide to end the loop */
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yd_mod_ctx_wrlock(ctx);
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for(node = usrtc_last(ctx->modules); ;node = usrtc_prev(ctx->modules, node)) {
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mod = (yd_mod_t *)usrtc_node_getdata(node);
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mod->shutdown(ctx);
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/* for() */
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if(node == usrtc_first(ctx->modules)) break;
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}
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yd_mod_ctx_unlock(ctx);
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return 0;
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}
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void yd_mainloop_exit(yd_context_t *ctx)
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{
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pthread_mutex_unlock(&ctx->looplock);
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return;
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}
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/*
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* daemon workout
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*/
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void yddaemon(yd_context_t *ctx)
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{
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pid_t pid;
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ydc_conf_val_t *rval;
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/* fork the first time to detach the controlling terminal
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* and avoid to be a group leader.
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*/
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pid = fork();
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if(pid < 0) exit(EXIT_FAILURE); /* something goes wrong ... */
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if(pid > 0) exit(EXIT_SUCCESS); /* parent can take a rest */
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/* try to become a session leader */
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if(setsid() < 0) exit(EXIT_FAILURE); /* something goes wrong ... */
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/* ignore fucking signals */
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signal(SIGCHLD, SIG_IGN);
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signal(SIGHUP, SIG_IGN);
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signal(SIGPIPE, SIG_IGN);
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/* fork the second time, to avoid be a session leader - the goal is
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* regain a terminal control never.
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*/
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pid = fork();
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if(pid < 0) exit(EXIT_FAILURE); /* something goes wrong ... */
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if(pid > 0) exit(EXIT_SUCCESS); /* parent can take a rest */
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/* reset mask */
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umask(0);
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/* change working directory to root */
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// chdir("/");
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#if 0
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/* test and change if set */
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if(!ydc_conf_get_val(ctx->zvalues, "daemon/workingdir", &rval)) {
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if(rval->type == STRING) chdir((const char *)rval->value);
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}
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#endif
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/* let's a deal */
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fclose(stdin);
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fclose(stderr);
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fclose(stdout);
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/* if oe - mean we allowing to write a lof file thru standard prints ... */
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stdin = fopen("/dev/null", "r");
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#if 0
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if(ctx->logcontext->se && !ydc_conf_get_val(ctx->zvalues, "daemon/logfile", &rval)) {
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if(rval->type == STRING) {
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stdout = fopen((char *)rval->value, "a");
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stderr = fopen((char *)rval->value, "a");
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}
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} else {
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#endif
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stdout = fopen("/dev/null", "a");
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stderr = fopen("/dev/null", "a");
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#if 0
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}
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#endif
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ctx->daemon = 1;
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return;
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}
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