initial work on daemon
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08aca40316
@ -6,13 +6,13 @@ AC_LANG([C])
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AM_INIT_AUTOMAKE
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# Checks for programs.
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AC_PROG_CC
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AC_PROG_CC_C99
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# Checks for libraries.
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PKG_CHECK_MODULES([gammu], [gammu >= 1.0])
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# Checks for header files.
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AC_CHECK_HEADERS([fcntl.h stdlib.h string.h syslog.h unistd.h])
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AC_CHECK_HEADERS([fcntl.h signal.h stdlib.h string.h syslog.h unistd.h])
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# Checks for typedefs, structures, and compiler characteristics.
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184
yasnd.c
184
yasnd.c
@ -1,63 +1,149 @@
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// #include <gammu/gammu.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <signal.h>
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#include <string.h>
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// #include <gammu/gammu.h>
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// Target hosts count
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#define NUM_HOSTS 3
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// Should we do excessive debug logging or not
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#define DEBUG
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typedef struct {
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char* hostname; // address of host
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pid_t helper_pid; // pid of helper('pinger') child process
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int fail_count; // how many times in a row host was unreachable
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} host_decl;
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host_decl hosts[NUM_HOSTS];
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void init()
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{
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hosts[0].hostname="10.0.0.1";
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hosts[0].fail_count=0;
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hosts[1].hostname="10.0.0.2";
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hosts[1].fail_count=0;
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hosts[2].hostname="10.0.0.254";
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hosts[2].fail_count=0;
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}
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void log_event(const char *message)
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{
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#ifdef DEBUG
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syslog(LOG_INFO,"%s",message);
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#endif
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}
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void check_host(int num,host_decl host)
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{
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pid_t pid = fork();
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if (pid < 0) {
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exit(EXIT_FAILURE);
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}
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// If pid == 0, then we are in the child
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if (pid == 0) {
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char tmp[50];
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sprintf(tmp, "Pinging host %s", host.hostname);
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log_event(tmp);
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execl("/bin/ping","/bin/ping","-c 4","-n",host.hostname,(char*) 0);
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// STUB: check result of exec call
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exit(EXIT_SUCCESS);
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}
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// Save child's pid
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host.helper_pid=pid;
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}
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void loop_function()
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{
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for (int i=0;i<NUM_HOSTS;i++)
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{
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check_host(i,hosts[i]);
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}
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for (int i=0;i<NUM_HOSTS;i++)
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{
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int pid_status;
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int result = waitpid(hosts[i].helper_pid, &pid_status, NULL);
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if (result > 0)
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{
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if (WIFEXITED(pid_status))
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{
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char tmp[50];
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sprintf(tmp, "Finished child %d with result %d", result, WEXITSTATUS(pid_status));
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log_event(tmp);
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// if host is alive - reset failure counter
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// otherwise - increment it
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if (WEXITSTATUS(pid_status) == 0)
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hosts[i].fail_count=0;
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else
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hosts[i].fail_count++;
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}
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}
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}
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}
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void termination_handler(int signum)
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{
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closelog();
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exit(EXIT_SUCCESS);
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}
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int main(void) {
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/* Our process ID and Session ID */
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pid_t pid, sid;
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/* Fork off the parent process */
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pid = fork();
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if (pid < 0) {
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exit(EXIT_FAILURE);
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}
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/* If we got a good PID, then
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we can exit the parent process. */
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if (pid > 0) {
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exit(EXIT_SUCCESS);
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}
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/* Our process ID and Session ID */
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pid_t pid, sid;
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/* Change the file mode mask */
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umask(0);
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/* Open any logs here */
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/* Create a new SID for the child process */
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sid = setsid();
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if (sid < 0) {
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/* Log the failure */
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exit(EXIT_FAILURE);
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}
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/* Fork off the parent process */
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pid = fork();
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if (pid < 0) {
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exit(EXIT_FAILURE);
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}
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/* If we got a good PID, then we can exit the parent process. */
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if (pid > 0) {
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exit(EXIT_SUCCESS);
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}
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/* Change the current working directory */
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if ((chdir("/")) < 0) {
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/* Log the failure */
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exit(EXIT_FAILURE);
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}
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/* Close out the standard file descriptors */
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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/* Daemon-specific initialization goes here */
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/* The Big Loop */
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while (1) {
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/* Do some task here ... */
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sleep(30); /* wait 30 seconds */
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}
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exit(EXIT_SUCCESS);
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/* Change the file mode mask */
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umask(0);
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/* Open any logs here */
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openlog("yasnd", LOG_PID|LOG_CONS, LOG_USER);
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/* Create a new SID for the child process */
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sid = setsid();
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if (sid < 0) {
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/* Log the failure */
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exit(EXIT_FAILURE);
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}
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/* Change the current working directory */
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if ((chdir("/")) < 0) {
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/* Log the failure */
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exit(EXIT_FAILURE);
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}
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/* Close out the standard file descriptors */
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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// Set signal handler for SIGTERM
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signal(SIGTERM, termination_handler);
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// Init apropriate structures
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init();
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/* The Big Loop */
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while (1) {
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loop_function();
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// sleep(60); /* wait 60 seconds */
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exit(EXIT_SUCCESS);
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}
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exit(EXIT_SUCCESS);
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}
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