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C - create Process Daemon

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  1. #include <stdio.h>
  2. #include <unistd.h>
  3.  
  4. #include <sys/types.h>
  5. #include <sys/stat.h>
  6.  
  7. int main(int argc, char *argv[])
  8. {
  9. 	/*
  10. 	 * Funzione che mi crea un demone
  11. 	 */
  12.  
  13. 	int pid;
  14.  
  15. 	// create - fork 1
  16. 	if(fork()) return 0;
  17.  
  18. 	// it separates the son from the father
  19. 	chdir("/");
  20. 	setsid();
  21. 	umask(0);
  22.  
  23. 	// create - fork 2
  24. 	pid = fork();
  25.  
  26. 	if(pid)
  27. 	{
  28. 		printf("Daemon: %d\n", pid);
  29. 		return 0;
  30. 	}
  31.  
  32. 	/****** Codice da eseguire ********/	
  33. 	FILE *f;
  34.  
  35. 	f=fopen("/tmp/coa.log", "w");
  36.  
  37. 	while(1)
  38. 	{
  39. 		fprintf(f, "ciao\n");
  40. 		fflush(f);
  41. 		sleep(2);
  42. 	}
  43. 	/**********************************/
  44. }

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