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;
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.
Requirements:
Compiles on g++ 4.0
No obj-c
OSX 10.5
Process info comes from 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 load comes from 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
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
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.
*/