I would like to change the y axis so the wave raises from 0.15 and the peak is at 0.18. Instead of -1 to 1 from scipy import signal import numpy as np import matplotlib.pyplot as plt t = np.linspace(0, 3, 500) plt.plot(t, signal.sawtooth(np.pi * 4 * t)) plt.show() >Solution : You could do the… Read More How to change sawtooth function so it raises from 0.15 to 0.18 instead of -1 to 1

I have this code: #include <signal.h> #include <unistd.h> #include <stdio.h> #include <sys/wait.h> #include <stdlib.h> int cpt = 0; void handler (int sig) { cpt++ ; } int main() { int i; signal(SIGCHLD, handler); for (i = 0; i < 5; i++) { if (fork() == 0) { exit(0); } } while (wait(NULL) != -1) ;… Read More Linux signals program doesn't return the same value on each execution

I have this code: #include <signal.h> #include <unistd.h> #include <stdio.h> #include <sys/wait.h> #include <stdlib.h> int cpt = 0; void handler (int sig) { cpt++ ; } int main() { int i; signal(SIGCHLD, handler); for (i = 0; i < 5; i++) { if (fork() == 0) { exit(0); } } while (wait(NULL) != -1) ;… Read More Linux signals program doesn't return the same value on each execution

In the following code, I try to send SIGINT, SIGHUP, SIGQUIT signal to child process. void sighup(int sig); void sigint(int sig); void sigquit(int sig); These are my signal handler. the issue is signal handler never invoked. #include<stdio.h> #include<signal.h> #include<stdlib.h> #include<unistd.h> void sighup(int sig); void sigint(int sig); void sigquit(int sig); int main() { int pid, i,… Read More How to fix signal handler functions are never invoked in c?

In my C program, I want to get the PID of the process, send a SIGSTOP to that and wait until a SIGCONT arrives from another terminal. So, the procedure looks like int pid_t = getpid(); printf("PID %d has been stopped\n", pid_t); STOP(pid_t); while (not_received_CONT(pid_t)) ; // continue the program How can I complete that?… Read More Stop/continue a C program

I’m using signal to transmit messages within my program, I write code like this: union sigval sv; sv.sival_ptr = (void*) data; pid_t pid = getpid(); if (sigqueue(pid, SIGUSR2, sv) != 0) { Log("failed: %d", errno); return 0; } else { // do something } And I found that if I don’t register a handler, my… Read More Linux signal: process exit if there's no handler

After reading the documentation I still don’t really understand signal blocking. If you have a mask that blocks a given signal, do you need to unblock that signal first to allow the program to intercept it or does signal blocking behave in a different way? If you use sigsuspend, does your program get suspended until… Read More Understanding signal blocking and signal suspension

i am trying to understand how signals works. When i put sigsuspend outside of the while loop the code works otherwise it doesn’t. Why? static void signal_handler(int sig) { printf("SIGUSR1 has been received!"); } int main() { struct sigaction sigact; sigset_t sigset; sigemptyset(&sigset); sigact.sa_handler = signal_handler; sigact.sa_mask = sigset; sigact.sa_flags = 0; sigaction(SIGUSR1, &sigact, NULL);… Read More Why sigsuspend does not work in while loop?