child-process

问题 I'm trying to write a Task control program, very much like Supervisor. I run some programs from a config file and let them run in the background, while in the main process I read and execute other commands. Before fork() -ing, in the main process I call: sigaction(SIGINT, &the_handler, NULL); Where the_handler stores the reference of a simple print function. When CTRL+C is pressed, the child processes are interrupted as well (which I don't want). I could run: signal(SIGINT, SIG_IGN); after

问题 I'm trying to write a Task control program, very much like Supervisor. I run some programs from a config file and let them run in the background, while in the main process I read and execute other commands. Before fork() -ing, in the main process I call: sigaction(SIGINT, &the_handler, NULL); Where the_handler stores the reference of a simple print function. When CTRL+C is pressed, the child processes are interrupted as well (which I don't want). I could run: signal(SIGINT, SIG_IGN); after

问题 I have a process that spawns a helper process. Sometimes I need to debug start-up failures in the second process. On Windows, I would use Image File Execution Options , or ntsd -o . However, I have no idea how to do this with gdb on OS X. 回答1: Use gdb --wait. For example, try gdb --wait TextEdit from the command line, then launch TextEdit. 回答2: I don't think that you can have gdb launch in the same manner. Instead, run your parent process from within gdb or attach to the running process

问题 I have a process that spawns a helper process. Sometimes I need to debug start-up failures in the second process. On Windows, I would use Image File Execution Options , or ntsd -o . However, I have no idea how to do this with gdb on OS X. 回答1: Use gdb --wait. For example, try gdb --wait TextEdit from the command line, then launch TextEdit. 回答2: I don't think that you can have gdb launch in the same manner. Instead, run your parent process from within gdb or attach to the running process

问题 I have the following script which executes a shell command: #!/usr/bin/env node const { execSync } = require('child_process'); try { const data = execSync( 'yarn licenses generate-disclaimer --prod', { encoding: 'utf8', maxBuffer: 50 * 1024 * 1024 } ); console.log(data.length); return true; } catch (error) { console.error(`Failed to generate disclaimer: ${error.message}`); return false; } data is a Buffer containing stdout of the child process. As I understand, the way to convert it to a

问题 I have the following script which executes a shell command: #!/usr/bin/env node const { execSync } = require('child_process'); try { const data = execSync( 'yarn licenses generate-disclaimer --prod', { encoding: 'utf8', maxBuffer: 50 * 1024 * 1024 } ); console.log(data.length); return true; } catch (error) { console.error(`Failed to generate disclaimer: ${error.message}`); return false; } data is a Buffer containing stdout of the child process. As I understand, the way to convert it to a

问题 I have the following script which executes a shell command: #!/usr/bin/env node const { execSync } = require('child_process'); try { const data = execSync( 'yarn licenses generate-disclaimer --prod', { encoding: 'utf8', maxBuffer: 50 * 1024 * 1024 } ); console.log(data.length); return true; } catch (error) { console.error(`Failed to generate disclaimer: ${error.message}`); return false; } data is a Buffer containing stdout of the child process. As I understand, the way to convert it to a

问题 My application places bets on certain sporting events. Almost like an automatic betting bot. A part of this is to track the current status of the event so it can make an informed calculation whether to place a bet or not. To do this, I poll the status of an event every minute using setInterval . A single sporting event is "watched" by 1 child process. There could be up 100+ sporting events at any one time meaning there could be 100+ child process' spawned & actively polling. worker/index.js

问题 #include <stdio.h> #include <unistd.h> int do_fork(int depth) { if (!depth) { return fork(); } int val = do_fork(depth - 1); printf("%d\n", val); return val; } int main() { int val; scanf("%d", &val); do_fork(val); } I tried this code several times, with several different values on several different machines. It doesn't matter how big the number is, I always see the pid of the child printed one next to the other with no zeros in between. Only when the pids are all printed, the child starts

问题 I have the following python code (script.py): import sys import numpy as np from scipy import stats def generateBeta() : fit = (0.075252656968743836, 498.49505071718869, 9.9999999999999991e-05, 0.18136881492296397) rnd = stats.beta.rvs(fit[0], fit[1], fit[2], fit[3], 581) rndStr = "" for i in rnd: rndStr += str(i) + ',' print rndStr[0:len(rndStr)-1] if __name__ =='__main__' : generateBeta() When running "python script.py" I get something like: 0.000461650100253,0.000100731728317,0