back to scratko.xyz
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--daemon.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/daemon.c b/daemon.c
new file mode 100644
index 0000000..6bdb46b
--- /dev/null
+++ b/daemon.c
@@ -0,0 +1,80 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <time.h>
+#include <stdlib.h>
+#include <syslog.h>
+
+volatile sig_atomic_t get_info = 0;
+volatile sig_atomic_t signal_counter = 0;
+
+void handler(int s)
+{
+ signal(SIGUSR1, handler);
+ signal(SIGALRM, handler);
+
+ switch(s) {
+ case SIGUSR1:
+ get_info = 1;
+ ++signal_counter;
+ break;
+ case SIGALRM:
+ get_info = 1;
+ alarm(300);
+ }
+}
+
+int main()
+{
+ int fd, pid;
+ char *path = "/tmp/ordinary_daemon.log";
+ FILE *file;
+ time_t start, end;
+ double dif;
+
+ signal(SIGUSR1, handler);
+ signal(SIGALRM, handler);
+ close(0);
+ close(1);
+ close(2);
+ open("/dev/null", O_RDONLY);
+ open("/dev/null", O_WRONLY);
+ open("/dev/null", O_WRONLY);
+ chdir("/");
+ pid = fork();
+ if(pid > 0)
+ exit(0);
+ setsid();
+ pid = fork();
+ if(pid > 0)
+ exit(0);
+ fd = open(path, O_CREAT | O_WRONLY | O_TRUNC, 0666);
+ file = fdopen(fd, "w");
+ if(fd == -1) {
+ perror("can't open file");
+ exit(1);
+ }
+ openlog("ordinary daemon", 0, LOG_USER);
+ syslog(LOG_INFO, "daemon started");
+ alarm(300);
+ pid = getpid();
+ time(&start);
+
+ while(1) {
+ pause();
+ if(get_info) {
+ time(&end);
+ dif = difftime(end, start);
+ fprintf(file, "time spent (in sec): %.2f pid: %u SIGUSR1: %u\n",
+ dif, pid, signal_counter);
+ syslog(LOG_INFO, "time spent (in sec): %.2f pid: %u SIGUSR1: %u",
+ dif, pid, signal_counter);
+ fflush(file);
+ get_info = 0;
+ }
+ }
+ closelog();
+ close(fd);
+ return 0;
+}