如何在 App Store 批准的应用程序中获取有关可用内存和正在运行的进程的信息?(是的，有一个！)

How to get information about free memory and running processes in an App Store approved app? (Yes, there is one!)(如何在 App Store 批准的应用程序中获取有关可用内存和正在运行的进程的信息?(是的，有一个！))

问题描述

There is an app called "Activity Monitor Touch" in the App Store, which displays background processes as well as free memory.

So there MUST be an public API to access this information. The evidence:

I'm already searching for days but can't find any good starting point. How can this app figure all this stuff out without any jailbreaking / hacking / etc.?

Until recently I was sure that something like this is absolutely impossible on iOS.

I've found this code snippet:

- (NSArray *)runningProcesses {

    int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};
    size_t miblen = 4;

    size_t size;
    int st = sysctl(mib, miblen, NULL, &size, NULL, 0);

    struct kinfo_proc * process = NULL;
    struct kinfo_proc * newprocess = NULL;

    do {

        size += size / 10;
        newprocess = realloc(process, size);

        if (!newprocess){

            if (process){
                free(process);
            }

            return nil;
        }

        process = newprocess;
        st = sysctl(mib, miblen, process, &size, NULL, 0);

    } while (st == -1 && errno == ENOMEM);

    if (st == 0){

        if (size % sizeof(struct kinfo_proc) == 0){
            int nprocess = size / sizeof(struct kinfo_proc);

            if (nprocess){

                NSMutableArray * array = [[NSMutableArray alloc] init];

                for (int i = nprocess - 1; i >= 0; i--){

                    NSString * processID = [[NSString alloc] initWithFormat:@"%d", process[i].kp_proc.p_pid];
                    NSString * processName = [[NSString alloc] initWithFormat:@"%s", process[i].kp_proc.p_comm];

                    NSDictionary * dict = [[NSDictionary alloc] initWithObjects:[NSArray arrayWithObjects:processID, processName, nil] 
                                                                        forKeys:[NSArray arrayWithObjects:@"ProcessID", @"ProcessName", nil]];
                    [processID release];
                    [processName release];
                    [array addObject:dict];
                    [dict release];
                }

                free(process);
                return [array autorelease];
            }
        }
    }

    return nil;
}

But I can't make it run on the iPhone. Xcode doesn't know these symbols: CTL_KERN, KERN_PROC, KERN_PROC_ALL

So of course I must import a header file or library. Does anyone know where these belong to, and how the headers must be imported to make this work?

Works like a charm:

#import <sys/sysctl.h>

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