Re_ _proc_PID_stat.pdf

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10.11.2018
Re: /proc/PID/stat
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Re: /proc/PID/stat
From:
Bharadwaj Yadavalli <sby ives lkg dec com>
To:
axp-list redhat com
Cc:
gatgul voicenet com
Subject:
Re: /proc/PID/stat
Date:
Wed, 24 Jan 2001 12:39:45 -0500 (EST)
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);
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10.11.2018
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';
Re: /proc/PID/stat
}
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
Follow-Ups:
Re: /proc/PID/stat
From:
Uncle George <gatgul@voicenet.com>
References:
/proc/PID/stat
From:
Uncle George <gatgul@voicenet.com>
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