Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Nanosleep in signal call
Top Forums Programming Nanosleep in signal call Post 302963488 by mattdj on Thursday 31st of December 2015 08:54:21 AM
Old 12-31-2015
THX for ansewer, mate !

Ok, so: I have to have some random numbers - Can I do that better? (1)
Second - I try to block SIGUSR1 -I will be grateful if you could tell if I do this in the right way.
Code:
void handler_signal(int signal)
{
   sigset_t pending; // syngaly oczekujace
   int losowy_czas ;  
   struct timespec ts; 
   int ret; 
   sigset_t mask; 
  
   sigemptyset (&mask);
   sigaddset (&mask, SIGUSR1); // block SIGUSR1
   
   srand((unsigned int) time(NULL));    //transfer RAND here
   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: 
		break;
	default:
		fprintf(stderr,"Zlapany zly sygnal: %d \n", signal); 
		return; 
  }

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

}


In the singal will be some read function but first I want to have sure that everything is all right.
 

9 More Discussions You Might Find Interesting

1. 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

2. 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

3. 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

4. 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

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. 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

7. 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

8. 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

9. 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

LEARN ABOUT OSF1

nanosleep

nanosleep(3)						     Library Functions Manual						      nanosleep(3)

NAME

       nanosleep - Suspends a process from execution for the specified timer interval (P1003.1b)

LIBRARY

       Realtime Library (librt.so, librt.a)

SYNOPSIS

       #include <time.h>

       int nanosleep (
       const struct timespec *rqtp,
       struct timespec *rmtp);

PARAMETERS

       *rqtp   A pointer to the timespec data structure that defines the time interval during which the calling process is suspended.

       *rmtp   A  pointer  to the timespec data structure that receives the amount of time remaining in the previously requested interval, or zero
	       if the full interval has elapsed.

DESCRIPTION

       The nanosleep function suspends a process until one of the following conditions is met:

	  o  The time interval specified in rqtp has elapsed.

	  o  A signal is delivered to the calling process and the action is to deliver a signal to a signal-catching function (or to terminate the
	     process).

       The  suspension	time may be longer than requested because the argument value is rounded up to an integer multiple of the clock resolution,
       or due to the scheduling of other activity. Except when it is interrupted by a signal, the suspension time is not less than the time speci-
       fied by the rqtp argument (as measured by the system clock).

RETURN VALUES

       When the nanosleep function returns because the requested time has elapsed, the call is successful and a value of 0 (zero) is returned.

       If the nanosleep function returns because it was interrupted by a signal, a value of -1 is returned.  If the rmtp argument is not NULL, the
       timespec structure referenced by the call is updated to contain the time remaining in the interval.  If the  rmtp  argument  is	NULL,  the
       remaining time is not returned.

       On an unsuccessful call, a value of -1 is returned and errno is set to indicate that an error occurred.

ERRORS

       The nanosleep function fails under the following conditions:

       [EINTR]	      The nanosleep function was interrupted by a signal.

       [EINVAL]       The rqtp argument specified a nanosecond value less than zero or greater than or equal to 1000 million.

RELATED INFORMATION

       Functions: sleep(1)

       Guide to Realtime Programming delim off

																      nanosleep(3)
All times are GMT -4. The time now is 12:46 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy