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/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright 1998 by Albert Cahalan; all rights reserved.
* Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <dirent.h>
#include <string.h>
#include <stdlib.h>
#include <sys/param.h>
#include <unistd.h>
#include <fcntl.h>
#include "libbb.h"
#define PROCPS_BUFSIZE 1024
static int read_to_buf(const char *filename, void *buf)
{
int fd;
ssize_t ret;
fd = open(filename, O_RDONLY);
if (fd < 0)
return -1;
ret = read(fd, buf, PROCPS_BUFSIZE-1);
((char *)buf)[ret > 0 ? ret : 0] = 0;
close(fd);
return ret;
}
procps_status_t * procps_scan(int save_user_arg0)
{
static DIR *dir;
struct dirent *entry;
static procps_status_t ret_status;
char *name;
int n;
char status[32];
char *status_tail;
char buf[PROCPS_BUFSIZE];
procps_status_t curstatus;
int pid;
long tasknice;
struct stat sb;
if (!dir) {
dir = bb_xopendir("/proc");
}
for (;;) {
if ((entry = readdir(dir)) == NULL) {
closedir(dir);
dir = 0;
return 0;
}
name = entry->d_name;
if (!(*name >= '0' && *name <= '9'))
continue;
memset(&curstatus, 0, sizeof(procps_status_t));
pid = atoi(name);
curstatus.pid = pid;
status_tail = status + sprintf(status, "/proc/%d", pid);
if (stat(status, &sb))
continue;
bb_getpwuid(curstatus.user, sb.st_uid, sizeof(curstatus.user));
/* see proc(5) for some details on this */
strcpy(status_tail, "/stat");
n = read_to_buf(status, buf);
if (n < 0)
continue;
name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
if (name == 0 || name[1] != ' ')
continue;
*name = 0;
sscanf(buf, "%*s (%15c", curstatus.short_cmd);
n = sscanf(name+2,
"%c %d "
"%*s %*s %*s %*s " /* pgrp, session, tty, tpgid */
"%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
"%lu %lu " /* utime, stime */
#else
"%*s %*s " /* utime, stime */
#endif
"%*s %*s %*s " /* cutime, cstime, priority */
"%ld " /* nice */
"%*s %*s %*s " /* timeout, it_real_value, start_time */
"%*s " /* vsize */
"%ld", /* rss */
curstatus.state, &curstatus.ppid,
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
&curstatus.utime, &curstatus.stime,
#endif
&tasknice,
&curstatus.rss);
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
if (n != 6)
#else
if (n != 4)
#endif
continue;
if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
curstatus.state[1] = 'W';
else
curstatus.state[1] = ' ';
if (tasknice < 0)
curstatus.state[2] = '<';
else if (tasknice > 0)
curstatus.state[2] = 'N';
else
curstatus.state[2] = ' ';
#ifdef PAGE_SHIFT
curstatus.rss <<= (PAGE_SHIFT - 10); /* 2**10 = 1kb */
#else
curstatus.rss *= (getpagesize() >> 10); /* 2**10 = 1kb */
#endif
if (save_user_arg0) {
strcpy(status_tail, "/cmdline");
n = read_to_buf(status, buf);
if (n > 0) {
if (buf[n-1]=='\n')
buf[--n] = 0;
name = buf;
while (n) {
if (((unsigned char)*name) < ' ')
*name = ' ';
name++;
n--;
}
*name = 0;
if (buf[0])
curstatus.cmd = strdup(buf);
/* if NULL it work true also */
}
}
return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
}
}
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