I want to write a console-based process manager. In the first step I think I should have a list of running proceses. I'm using Windows.

• c
• windows

You can look at this example on MSDN. This might also help.

Well, since you wanted to know how to do this on mac, this can't hurt:

struct ProcessList {
    pid_t value;
    struct ProcessList *next;
};

struct ProcessList *getProcesses()
{
    struct ProcessList *process = malloc(sizeof(struct ProcessList));
    struct ProcessList *next = process;
    ProcessSerialNumber psn = { 0, kNoProcess };

    GetProcessPID(&psn, &process->value);

    while (noErr == GetNextProcess(&psn)) {
        pid_t pid;
        if (noErr == GetProcessPID(&psn, &pid)) {
            next = next->next = malloc(sizeof(struct ProcessList));
            next->value = pid;
        }
    }

    next->next = NULL;
    return process;
}

Obviously, this returns a linked list of the processes running, until you hit NULL for a process list.

You can use the CreateToolhelp32Snapshot function to create a snapshot of the currently running processes. Then you can use Process32First and Process32Next to enumerate through this list.