SHELL

How to get process id

#include <iostream>
#include <Windows.h>
#include <tlhelp32.h>
#include <tchar.h>

std::uint32_t get_proc_id(const std::wstring& name)
{
	auto result = 0ul;
	auto snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);

	if (snapshot == INVALID_HANDLE_VALUE)
		return result;

	auto pe32w = PROCESSENTRY32W{};				// use the wide version of the struct
	pe32w.dwSize = sizeof(PROCESSENTRY32W);

	if (!Process32FirstW(snapshot, &pe32w))
		return CloseHandle(snapshot), result;

	while (Process32NextW(snapshot, &pe32w))
	{
		if (name == pe32w.szExeFile)			// use std::wstring's operator, not comparing pointers here
		{
			result = pe32w.th32ProcessID;
			break;
		}
	}

	CloseHandle(snapshot);
	return result;
}

int main()
{
	const auto pid = get_proc_id(L"explorer.exe");
	std::cout << pid;

	std::cin.get();
}

how to get process id in linux

lsof -i tcp:3000
kill -9 pId

To get process ID

julien@ubuntu:~/c/shell$ cat pid.c
#include <stdio.h>
#include <unistd.h>

/**
 * main - PID
 *
 * Return: Always 0.
 */
int main(void)
{
    pid_t my_pid;

    my_pid = getpid();
    printf("%u
", my_pid);
    return (0);
}
julien@ubuntu:~/c/shell$ gcc -Wall -Werror -pedantic pid.c -o mypid && ./mypid
3237
julien@ubuntu:~/c/shell$ ./mypid 
3238
julien@ubuntu:~/c/shell$ ./mypid 
3239
julien@ubuntu:~/c/shell$