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/*
AND auto nice daemon - renice programs according to their CPU usage.
Copyright (C) 1999-2003 Patrick Schemitz <schemitz@users.sourceforge.net>
http://and.sourceforge.net/
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <ctype.h>
#include <syslog.h>
#include <sys/stat.h>
#include <signal.h>
#include <asm/param.h> /* kernel interrupt frequency: HZ */
#include "and.h"
/*
AND -- auto-nice daemon/Linux version.
Linux-specific AND version. Makes excessive use of the Linux
/proc filesystem and is not portable.
1999-2003 Patrick Schemitz, <schemitz@users.sourceforge.net>
http://and.sourceforge.net/
*/
static DIR *linux_procdir = 0;
static struct and_procent linux_proc;
int linux_readproc (char *fn)
{
/* Scan /proc/<pid>/stat file. Format described in proc(5).
l1: pid comm state ppid
l2: pgrp session tty tpgid
l3: flags minflt cminflt majflt cmajflt
l4: utime stime cutime cstime
l5: counter priority
*/
FILE* f;
int i;
long li;
long unsigned u, ujf, sjf;
char state;
char buffer [1024];
if (!(f = fopen(fn,"rt"))) return 0;
fscanf(f,"%d %1023s %c %d",&(linux_proc.pid),buffer,&state,&(linux_proc.ppid));
fscanf(f,"%d %d %d %d",&i,&i,&i,&i);
fscanf(f,"%lu %lu %lu %lu %lu",&u,&u,&u,&u,&u);
fscanf(f,"%lu %lu %ld %ld",&ujf,&sjf,&li,&li);
fscanf(f,"%ld %d",&li,&(linux_proc.nice));
i = feof(f);
fclose(f);
if (i) return 0;
if (state == 'Z') return 0; /* ignore zombies */
ujf += sjf; /* take into account both usr and sys time */
ujf /= HZ; /* convert jiffies to seconds */
linux_proc.utime = ujf > INT_MAX ? INT_MAX: (int) ujf;
buffer[strlen(buffer)-1] = 0; /* remove () around command name */
strncpy(linux_proc.command,&buffer[1],1023);
linux_proc.command[1023] = 0;
and_printf(3, "Linux: process %s pid: %d ppid: %d\n",
linux_proc.command, linux_proc.pid, linux_proc.ppid);
return 1;
}
struct and_procent *linux_getnext ()
{
char name [1024];
struct dirent *entry;
struct stat dirstat;
if (!linux_procdir) return NULL;
while ((entry = readdir(linux_procdir)) != NULL) { /* omit . .. apm bus... */
if (isdigit(entry->d_name[0])) break;
}
if (!entry) return NULL;
/* stat() /proc/<pid> directory to get uid/gid */
snprintf(name, 1024, "/proc/%s",entry->d_name);
if (stat(name,&dirstat)) return linux_getnext();
/* read the job's stat "file" to get command, nice level, etc */
snprintf(name, 1024, "/proc/%s/stat",entry->d_name);
if (!linux_readproc(name)) return linux_getnext();
linux_proc.uid = dirstat.st_uid;
linux_proc.gid = dirstat.st_gid;
return &linux_proc;
}
struct and_procent *linux_getfirst ()
{
if (linux_procdir) {
rewinddir(linux_procdir);
} else {
linux_procdir = opendir("/proc");
if (!linux_procdir) {
and_printf(0,"cannot open /proc, aborting.\n");
abort();
}
}
return linux_getnext();
}
int main (int argc, char** argv)
{
and_setprocreader(&linux_getfirst,&linux_getnext);
return and_main(argc,argv);
}
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