Nanosleep in signal call


 
Thread Tools Search this Thread
Top Forums Programming Nanosleep in signal call
Prev   Next
# 1  
Old 12-30-2015
Nanosleep in signal call

Hi @ll Smilie

I have a problem with my code but first a short description:

1. I have one signal call SIGUSR1
2. In the signal I try to use nanosleep and now:

When I put kill -SIGUSR1 pid --> sometimes works fine, sometimes returns me an error with ,,Interrupt system call", sometimes I got error with "Success". Why? What mistake did I make? How to improve that?

My code:

Code:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <time.h>

void handler_signal(int signal)
{
   const char *signal_name;
   sigset_t pending; // syngaly oczekujace
   int losowy_czas ;  
   struct timespec ts; 
   int ret; 
   
   
   losowy_czas = rand() % 15 + 5;  
   ts.tv_sec = 0; 
   ts.tv_nsec = losowy_czas * 100000000;
   
   ret = clock_nanosleep(CLOCK_MONOTONIC,0,&ts,NULL); 

   if(ret)
	perror("Blad funkcji clock_nanosleep");   	


   switch(signal)
   {
   	case SIGUSR1:
		signal_name = "SIGUSR1"; 
		break;
	default:
		fprintf(stderr,"Zlapany zly sygnal: %d \n", signal); 
		return; 
  }

  //unsafe I know ! 
  printf("To ja - sygnal ! %s Wylosowany czas %d \n", signal_name,losowy_czas);  

}
int main(int argc, char *argv[])
{
   int i; 
   char *endptr; 
 
   struct sigaction sa; 	
 
  
   srand((unsigned int) time(NULL)); 
   /*     PROCES P    */


   sa.sa_handler = &handler_signal;
   sa.sa_flags = SA_RESTART; 
   
   sigfillset(&sa.sa_mask); 
   
   if(sigaction(SIGUSR1,&sa,NULL) == -1)
   {
	perror("Nie mozna obsluzyc SIGUSR1");	
   }

   
   for(i=0; i<2000; i++)
   {
     printf("Running %i \n", i);
     sleep(1); 
   }  

   return;
}


Last edited by Scrutinizer; 12-30-2015 at 02:33 PM.. Reason: Spelling
 
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Programming

nanosleep

Application runs on both solaris 6 and 10. solaris 6 having only posix4.so library, solaris 10 having libposix4.so and librt.so Can we link application to lposix4 instead of lrt for nanosleep, sothat application will run in both machines? (2 Replies)
Discussion started by: satish@123
2 Replies

2. Programming

Where is nanosleep?

I use nanosleep under solaris10,like follows: #include <pthread.h> #include <time.h> #include <sys/time.h> struct to_info{ void (*to_fn)(void *); void *to_arg; struct timespec to_wait; }; void *timeout_helper(void *arg){ struct to_info *tip; nanosleep(&tip->to_wait,NULL);... (1 Reply)
Discussion started by: konvalo
1 Replies

3. UNIX for Dummies Questions & Answers

Why do I need to call make if I call gcc ?

Why do I need to call make if I call gcc ? I thought gcc already compiles the sources. thanks (1 Reply)
Discussion started by: aneuryzma
1 Replies

4. Infrastructure Monitoring

diffrence between method call and function call in perl

Hello, I have a problem with package and name space. require "/Mehran/DSGateEngineLib/general.pl"; use strict; sub System_Status_Main_Service_Status_Intrusion_Prevention { my %idpstatus; my @result; &General_ReadHash("/var/dsg/idp/settings",\%idpstatus); #print... (4 Replies)
Discussion started by: Zaxon
4 Replies

5. Programming

Problem with signal handler and interrupted system call

Hi, I have a daq program that runs in an infinite loop until it receives SIGINT. A handler catches the signal and sets a flag to stop the while loop. After the loop some things have to be cleaned up. The problem is that I want my main while loop to wait until the next full second begins, to... (2 Replies)
Discussion started by: soeckel
2 Replies

6. Programming

nanosleep returns prematurely, with return value 0

Hi, I have encountered the following problem on Solaris 10: I have a thread that is asleep on nanosleep (set to 24 hours). Something that happens on another thread, causes the nanosleep to exit, even though the time has not elapsed. The returned value is 0 (so it doesn't look like it... (1 Reply)
Discussion started by: MeMyself
1 Replies

7. UNIX for Advanced & Expert Users

how to differentiate system call from library call

Hi, Ho do I differentiate system call from library call? for example if I am using chmod , how do I find out if it is a system call or library call? Thanks Muru (2 Replies)
Discussion started by: muru
2 Replies

8. Programming

nanosleep

Hello, Can anyone, please, guide me on the use of nanosleep. I'm learning threads. I want to introduce a delay (not nested for loops, something more customizable). Nanosleep looked useful (or any other form of customizable and easy-to-use delay). Sleep is too long. :) (2 Replies)
Discussion started by: ameya
2 Replies

9. Programming

sigwait system call in UNIX signal

Hi Everybody, I have gone through man of sigwait and new to UNIX signals. Could anyone explain me about the following lines mentioned in sigwait man help ? "The selection of a signal in set is independent of the signal mask of the calling thread or LWP. This means a thread or LWP can ... (1 Reply)
Discussion started by: md7ahuja
1 Replies
Login or Register to Ask a Question