1 use crate::{syscall::SystemError, time::TimeSpec}; 2 3 use super::ProcessControlBlock; 4 5 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)] 6 #[repr(C)] 7 pub struct RUsage { 8 /// User time used 9 pub ru_utime: TimeSpec, 10 /// System time used 11 pub ru_stime: TimeSpec, 12 13 // 以下是linux的rusage结构体扩展 14 /// Maximum resident set size 15 pub ru_maxrss: usize, 16 /// Integral shared memory size 17 pub ru_ixrss: usize, 18 /// Integral unshared data size 19 pub ru_idrss: usize, 20 /// Integral unshared stack size 21 pub ru_isrss: usize, 22 /// Page reclaims (soft page faults) 23 pub ru_minflt: usize, 24 /// Page faults (hard page faults) 25 pub ru_majflt: usize, 26 /// Swaps 27 pub ru_nswap: usize, 28 /// Block input operations 29 pub ru_inblock: usize, 30 /// Block output operations 31 pub ru_oublock: usize, 32 /// IPC messages sent 33 pub ru_msgsnd: usize, 34 /// IPC messages received 35 pub ru_msgrcv: usize, 36 /// Signals received 37 pub ru_nsignals: usize, 38 /// Voluntary context switches 39 pub ru_nvcsw: usize, 40 /// Involuntary context switches 41 pub ru_nivcsw: usize, 42 } 43 44 /// 45 /// Definition of struct rusage taken from BSD 4.3 Reno 46 /// 47 /// We don't support all of these yet, but we might as well have them.... 48 /// Otherwise, each time we add new items, programs which depend on this 49 /// structure will lose. This reduces the chances of that happening. 50 #[derive(Debug, Clone, Copy, PartialEq, Eq)] 51 pub enum RUsageWho { 52 RUsageSelf = 0, 53 RUsageChildren = -1, 54 /// sys_wait4() uses this 55 RUsageBoth = -2, 56 /// only the calling thread 57 RusageThread = 1, 58 } 59 60 impl TryFrom<i32> for RUsageWho { 61 type Error = SystemError; 62 63 fn try_from(value: i32) -> Result<Self, Self::Error> { 64 match value { 65 0 => Ok(RUsageWho::RUsageSelf), 66 -1 => Ok(RUsageWho::RUsageChildren), 67 -2 => Ok(RUsageWho::RUsageBoth), 68 1 => Ok(RUsageWho::RusageThread), 69 _ => Err(SystemError::EINVAL), 70 } 71 } 72 } 73 74 impl ProcessControlBlock { 75 /// 获取进程资源使用情况 76 /// 77 /// ## TODO 78 /// 79 /// 当前函数尚未实现，只是返回了一个默认的RUsage结构体 80 pub fn get_rusage(&self, _who: RUsageWho) -> Option<RUsage> { 81 let rusage = RUsage::default(); 82 83 Some(rusage) 84 } 85 } 86