使用procf/< pid>/状态了解进程状态

本文介绍了使用procf/< pid>/状态了解进程状态的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用Solaris.

I am working on Solaris.

我知道，如果有一个正在运行的进程，则有一个名为/proc/<PID>/status的文件，其中<PID>是进程ID，它包含一个名为state的字段.

I know that if there is a process running, there is a file called /proc/<PID>/status, where <PID> is the process id, and it contains a field called state.

作为示例，我使用了我的shell程序:

As an example, I used my shell process:

> ps PID TTY TIME CMD 18671 0:01 tcsh

其进程ID为18671.

whose process id is 18671.

我编写了一个简单的C程序来提取该信息:

I had written a simple C program for extracting that information:

#include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/procfs.h> #include <sys/fcntl.h> static void get_status (pid_t pid) { char procpath[100]; char buf[100]; int pfd; char State[100]; char Name[100]; prstatus_t * pms; FILE *proc; sprintf(procpath, "/proc/%d/status", pid); proc = fopen(procpath,"r"); if (proc) { printf("Open Successful\n"); fgets(buf,256,proc); sscanf(buf,"Name:\t%s",Name); fgets(buf,256,proc); sscanf(buf,"State:\t%c",State); } printf("%s",Name); printf("%s",State); } int main(int argc, char **argv) { get_status(18671); }

它不会产生任何输出:

> ./a.out Open Successful >

procfs的在线资料说，我们只需在proc/<pid>/status上做个尝试，即可检查过程的状态.

The online material for procfs says that we can simply do a cat on proc/<pid>/status and check the state of the process.

但是对于我来说，它是一个二进制文件.我从未在任何地方看到它是二进制的.

But in my case it's a binary file. I never saw it mentioned anywhere that it is binary.

有没有一种方法可以使用简单的C程序来获取当前进程的状态?

Is there a way where I could use a simple C program to get the state of the current process?

也可以接受C ++解决方案.

A C++ solution would also be acceptable.

推荐答案

这是您应该从/proc/pid/status中读取的结构:

This is the struct you should read out of /proc/pid/status:

typedef struct pstatus { int pr_flags; /* flags (see below) */ int pr_nlwp; /* number of active lwps in the process */ pid_t pr_pid; /* process id */ pid_t pr_ppid; /* parent process id */ pid_t pr_pgid; /* process group id */ pid_t pr_sid; /* session id */ id_t pr_aslwpid; /* historical; now always zero */ id_t pr_agentid; /* lwp id of the /proc agent lwp, if any */ sigset_t pr_sigpend; /* set of process pending signals */ uintptr_t pr_brkbase; /* address of the process heap */ size_t pr_brksize; /* size of the process heap, in bytes */ uintptr_t pr_stkbase; /* address of the process stack */ size_t pr_stksize; /* size of the process stack, in bytes */ timestruc_t pr_utime; /* process user cpu time */ timestruc_t pr_stime; /* process system cpu time */ timestruc_t pr_cutime; /* sum of children's user times */ timestruc_t pr_cstime; /* sum of children's system times */ sigset_t pr_sigtrace; /* set of traced signals */ fltset_t pr_flttrace; /* set of traced faults */ sysset_t pr_sysentry; /* set of system calls traced on entry */ sysset_t pr_sysexit; /* set of system calls traced on exit */ char pr_dmodel; /* data model of the process (see below) */ char pr_pad[3]; taskid_t pr_taskid; /* task id */ projid_t pr_projid; /* project id */ int pr_nzomb; /* number of zombie lwps in the process */ zoneid_t pr_zoneid; /* zone id */ int pr_filler[15]; /* reserved for future use */ lwpstatus_t pr_lwp; /* status of the representative lwp */ } pstatus_t;

请注意，它是在头文件procfs.h中定义的.声明一个pstatus_t变量，并将sizeof(pstatus_t)个字节读入该变量.

Note it's defined in header file procfs.h. Declare a pstatus_t variable and read sizeof(pstatus_t) bytes into that variable.

提示:也不能通过ls使用，也可以使用/proc/self/psinfo读取自身过程的psinfo.

Tip: Also not available through ls, you can also use /proc/self/psinfo to read psinfo of self process.