在 Darwin/OSX 中以编程方式确定进程信息

问题描述

我有一个具有以下成员函数的类:

I have a class with the following member functions:

/// caller pid
virtual pid_t Pid() const = 0; 

/// physical memory size in KB
virtual uint64_t Size() const = 0;  

/// resident memory for this process
virtual uint64_t Rss() const = 0; 

/// cpu used by this process
virtual double PercentCpu() const = 0; 

/// memory used by this process
virtual double PercentMemory() const = 0; 

/// number of threads in this process
virtual int32_t Lwps() const = 0; 

这个类的职责是返回有关调用者的进程信息.物理内存大小可以很容易地通过 sysctl 调用来确定，而 pid 是微不足道的，但除了在 ps 或 top 上调用 popen 并解析输出之外，其余的调用都让我无法接受——这是不可接受的.任何帮助将不胜感激.

This class' duty is to return process information about caller. Physical memory size can easily determined by a sysctl call, and pid is trivial, but the remaining calls have eluded me, aside from invoking a popen on ps or top and parsing the output - which isn't acceptable. Any help would be greatly appreciated.

要求:
在 g++ 4.0 上编译
没有 obj-c
OSX 10.5

Requirements:
Compiles on g++ 4.0
No obj-c
OSX 10.5

推荐答案

进程信息来自pidinfo:

cristi:~ diciu$ grep proc_pidinfo /usr/include/libproc.h

int proc_pidinfo(int pid, int flavor, uint64_t arg,  void *buffer, int buffersize);

cpu 负载来自host_statistics:

cristi:~ diciu$ grep -r host_statistics /usr/include/

/usr/include/mach/host_info.h:/* host_statistics() */

/usr/include/mach/mach_host.defs:routine host_statistics(

/usr/include/mach/mach_host.h:/* Routine host_statistics */

/usr/include/mach/mach_host.h:kern_return_t host_statistics

有关更多详细信息，请查看 top 和 lsof 的源代码，它们是开源的(您需要注册为 Apple 开发人员，但这是免费的):

For more details, check out sources for top and lsof, they are open source (you need to register as an Apple developer but that's free of charge):

https://opensource.apple.com/source/top/top-111.20.1/libtop.c.auto.html

后期所有这些接口都是特定于版本的，因此您在编写生产代码 (libproc.h) 时需要考虑到这一点:

Later edit: All these interfaces are version specific, so you need to take that into account when writing production code (libproc.h):

/*
 * This header file contains private interfaces to obtain process information.
 * These interfaces are subject to change in future releases.
 */

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