How to fix ‘Certificate Import Error: The Private Key for this Client Certificate is missing or invalid’ error in the import certificate file

I work on Ubuntu 19. I have a .crt and a key file. I want to test my web app on https localhost. I wanted to add crt file to Chrome (settings > advanced > manage certificates -> import ). So I tried to import the .crt file but I got is this: “Certificate Import … Read more

Determine if a network interface is wireless or wired

I have a program that has two separate sections: one of them should be executed when the network interface is wireless LAN and the other one when it’s a wired LAN connection. How can I know that inside of my program? What function should I use to get that information? Answer If your device name … Read more

poll system call timeout

Attaching strace shows a lot of these messages: poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=10, events=POLLIN}], 6, 0) = 0 (Timeout) poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=10, events=POLLIN}], 6, 0) = 0 (Timeout) poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=10, events=POLLIN}], 6, … Read more

Error message “undefined reference for `CPU_ZERO'”

I included: #include <sched.h> #define _GNU_SOURCE Then in my code I have written (brief mention): cpu_set_t set; CPU_ZERO(&set); CPU_SET(proc_num, &set); if (sched_setaffinity(gettid(), sizeof(cpu_set_t), &set)) { perror(“sched_setaffinity”); return NULL; } But when I compile I find undefined reference to ‘CPU_ZERO’ undefined reference to ‘CPU_SET’ How can I fix this problem? Answer You need to place #define … Read more

How do I know if MongoDB needs more CPU/RAM? [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Stack Overflow. Closed 7 years ago. Improve this question I have a MongoDB server running on an inexpensive Linux VPS (1 x 2.0GHz CPU and 1GB RAM). It’s … Read more