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Re: /proc/PID/stat



	From : Uncle George <gatgul@voicenet.com>
	Date : Tue Jan 23 20:11:30 2001
        
        Is there a pgm that will interpret all the fields that are printed by
        
        cat /proc/PID/stat ( or statm, or any of the info on a per process basis
        )

See if the following simple function and the associated structure
that I put together sometime ago while checking out some threads-
related stuff on Linux/Alpha is of use. Also note that the format 
characters as given in the man page for proc are not all correct 
on Alpha. I just when to the sources to get them right (RTFS?:-))

typedef struct statstruct_proc {
  int           pid;                      /** The process id. **/
  char          exName [_POSIX_PATH_MAX]; /** The filename of the executable **/
  char          state; /** 1 **/          /** R is running, S is sleeping, 
			   D is sleeping in an uninterruptible wait,
			   Z is zombie, T is traced or stopped **/
  unsigned      euid,                      /** effective user id **/
                egid;                      /** effective group id */					     
  int           ppid;                     /** The pid of the parent. **/
  int           pgrp;                     /** The pgrp of the process. **/
  int           session;                  /** The session id of the process. **/
  int           tty;                      /** The tty the process uses **/
  int           tpgid;                    /** (too long) **/
  unsigned int	flags;                    /** The flags of the process. **/
  unsigned int	minflt;                   /** The number of minor faults **/
  unsigned int	cminflt;                  /** The number of minor faults with childs **/
  unsigned int	majflt;                   /** The number of major faults **/
  unsigned int  cmajflt;                  /** The number of major faults with childs **/
  int           utime;                    /** user mode jiffies **/
  int           stime;                    /** kernel mode jiffies **/
  int		cutime;                   /** user mode jiffies with childs **/
  int           cstime;                   /** kernel mode jiffies with childs **/
  int           counter;                  /** process's next timeslice **/
  int           priority;                 /** the standard nice value, plus fifteen **/
  unsigned int  timeout;                  /** The time in jiffies of the next timeout **/
  unsigned int  itrealvalue;              /** The time before the next SIGALRM is sent to the process **/
  int           starttime; /** 20 **/     /** Time the process started after system boot **/
  unsigned int  vsize;                    /** Virtual memory size **/
  unsigned int  rss;                      /** Resident Set Size **/
  unsigned int  rlim;                     /** Current limit in bytes on the rss **/
  unsigned int  startcode;                /** The address above which program text can run **/
  unsigned int	endcode;                  /** The address below which program text can run **/
  unsigned int  startstack;               /** The address of the start of the stack **/
  unsigned int  kstkesp;                  /** The current value of ESP **/
  unsigned int  kstkeip;                 /** The current value of EIP **/
  int		signal;                   /** The bitmap of pending signals **/
  int           blocked; /** 30 **/       /** The bitmap of blocked signals **/
  int           sigignore;                /** The bitmap of ignored signals **/
  int           sigcatch;                 /** The bitmap of catched signals **/
  unsigned int  wchan;  /** 33 **/        /** (too long) **/
  int		sched, 		  /** scheduler **/
                sched_priority;		  /** scheduler priority **/
		
} procinfo;

int get_proc_info(pid_t pid, procinfo * pinfo)
{
  char szFileName [_POSIX_PATH_MAX],
    szStatStr [2048],
    *s, *t;
  FILE *fp;
  struct stat st;
  
  if (NULL == pinfo) {
    errno = EINVAL;
    return -1;
  }

  sprintf (szFileName, "/proc/%u/stat", (unsigned) pid);
  
  if (-1 == access (szFileName, R_OK)) {
    return (pinfo->pid = -1);
  } /** if **/

  if (-1 != stat (szFileName, &st)) {
  	pinfo->euid = st.st_uid;
  	pinfo->egid = st.st_gid;
  } else {
  	pinfo->euid = pinfo->egid = -1;
  }
  
  
  if ((fp = fopen (szFileName, "r")) == NULL) {
    return (pinfo->pid = -1);
  } /** IF_NULL **/
  
  if ((s = fgets (szStatStr, 2048, fp)) == NULL) {
    fclose (fp);
    return (pinfo->pid = -1);
  }

  /** pid **/
  sscanf (szStatStr, "%u", &(pinfo->pid));
  s = strchr (szStatStr, '(') + 1;
  t = strchr (szStatStr, ')');
  strncpy (pinfo->exName, s, t - s);
  pinfo->exName [t - s] = '\0';
  
  sscanf (t + 2, "%c %d %d %d %d %d %u %u %u %u %u %d %d %d %d %d %d %u %u %d %u %u %u %u %u %u %u %u %d %d %d %d %u",
	  /*       1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33*/
	  &(pinfo->state),
	  &(pinfo->ppid),
	  &(pinfo->pgrp),
	  &(pinfo->session),
	  &(pinfo->tty),
	  &(pinfo->tpgid),
	  &(pinfo->flags),
	  &(pinfo->minflt),
	  &(pinfo->cminflt),
	  &(pinfo->majflt),
	  &(pinfo->cmajflt),
	  &(pinfo->utime),
	  &(pinfo->stime),
	  &(pinfo->cutime),
	  &(pinfo->cstime),
	  &(pinfo->counter),
	  &(pinfo->priority),
	  &(pinfo->timeout),
	  &(pinfo->itrealvalue),
	  &(pinfo->starttime),
	  &(pinfo->vsize),
	  &(pinfo->rss),
	  &(pinfo->rlim),
	  &(pinfo->startcode),
	  &(pinfo->endcode),
	  &(pinfo->startstack),
	  &(pinfo->kstkesp),
	  &(pinfo->kstkeip),
	  &(pinfo->signal),
	  &(pinfo->blocked),
	  &(pinfo->sigignore),
	  &(pinfo->sigcatch),
	  &(pinfo->wchan));
  fclose (fp);
  return 0;
}


Bharadwaj





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