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/* vi: set sw=4 ts=4: */
/*
* Mini ps implementation(s) for busybox
*
* Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
* Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
*
* 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
*/
/*
* This contains _two_ implementations of ps for Linux. One uses the
* traditional /proc virtual filesystem, and the other use the devps kernel
* driver (written by Erik Andersen to avoid using /proc thereby saving 100k+).
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <termios.h>
#include <sys/ioctl.h>
#include "busybox.h"
static const int TERMINAL_WIDTH = 79; /* not 80 in case terminal has linefold bug */
#if ! defined CONFIG_FEATURE_USE_DEVPS_PATCH
extern int ps_main(int argc, char **argv)
{
procps_status_t * p;
int i, len;
#ifdef CONFIG_FEATURE_AUTOWIDTH
struct winsize win = { 0, 0, 0, 0 };
int terminal_width = TERMINAL_WIDTH;
#else
#define terminal_width TERMINAL_WIDTH
#endif
#ifdef CONFIG_FEATURE_AUTOWIDTH
ioctl(fileno(stdout), TIOCGWINSZ, &win);
if (win.ws_col > 0)
terminal_width = win.ws_col - 1;
#endif
printf(" PID Uid VmSize Stat Command\n");
while ((p = procps_scan(1)) != 0) {
char *namecmd = p->cmd;
if(p->rss == 0)
len = printf("%5d %-8s %s ", p->pid, p->user, p->state);
else
len = printf("%5d %-8s %6ld %s ", p->pid, p->user, p->rss, p->state);
i = terminal_width-len;
if(namecmd != 0 && namecmd[0] != 0) {
if(i < 0)
i = 0;
if(strlen(namecmd) > i)
namecmd[i] = 0;
printf("%s\n", namecmd);
} else {
namecmd = p->short_cmd;
if(i < 2)
i = 2;
if(strlen(namecmd) > (i-2))
namecmd[i-2] = 0;
printf("[%s]\n", namecmd);
}
free(p->cmd);
}
return EXIT_SUCCESS;
}
#else /* CONFIG_FEATURE_USE_DEVPS_PATCH */
/* The following is the second ps implementation --
* this one uses the nifty new devps kernel device.
*/
#include <linux/devps.h> /* For Erik's nifty devps device driver */
extern int ps_main(int argc, char **argv)
{
char device[] = "/dev/ps";
int i, j, len, fd;
pid_t num_pids;
pid_t* pid_array = NULL;
struct pid_info info;
char uidName[9];
#ifdef CONFIG_FEATURE_AUTOWIDTH
struct winsize win = { 0, 0, 0, 0 };
int terminal_width = TERMINAL_WIDTH;
#else
#define terminal_width TERMINAL_WIDTH
#endif
if (argc > 1 && **(argv + 1) == '-')
show_usage();
/* open device */
fd = open(device, O_RDONLY);
if (fd < 0)
perror_msg_and_die( "open failed for `%s'", device);
/* Find out how many processes there are */
if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
perror_msg_and_die( "\nDEVPS_GET_PID_LIST");
/* Allocate some memory -- grab a few extras just in case
* some new processes start up while we wait. The kernel will
* just ignore any extras if we give it too many, and will trunc.
* the list if we give it too few. */
pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
pid_array[0] = num_pids+10;
/* Now grab the pid list */
if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
perror_msg_and_die("\nDEVPS_GET_PID_LIST");
#ifdef CONFIG_FEATURE_AUTOWIDTH
ioctl(fileno(stdout), TIOCGWINSZ, &win);
if (win.ws_col > 0)
terminal_width = win.ws_col - 1;
#endif
/* Print up a ps listing */
printf(" PID Uid Stat Command\n");
for (i=1; i<pid_array[0] ; i++) {
info.pid = pid_array[i];
if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
perror_msg_and_die("\nDEVPS_GET_PID_INFO");
/* Make some adjustments as needed */
my_getpwuid(uidName, info.euid);
if(p.vmsize == 0)
len = printf("%5d %-8s %c ", p.pid, uidName, p.state);
else
len = printf("%5d %-8s %6d %c ", p.pid, uidName, p.vmsize, p.state);
if (strlen(info.command_line) > 1) {
for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) {
if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') {
*(info.command_line+j) = ' ';
}
}
*(info.command_line+j) = '\0';
puts(info.command_line);
} else {
printf("[%s]\n", info.name);
}
}
/* Free memory */
free( pid_array);
/* close device */
if (close (fd) != 0)
perror_msg_and_die("close failed for `%s'", device);
exit (0);
}
#endif /* CONFIG_FEATURE_USE_DEVPS_PATCH */
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