190 lines
4.9 KiB
C
190 lines
4.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini ps implementation(s) for busybox
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*
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* Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
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* Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* This contains _two_ implementations of ps for Linux. One uses the
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* traditional /proc virtual filesystem, and the other use the devps kernel
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* driver (written by Erik Andersen to avoid using /proc thereby saving 100k+).
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <string.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include "busybox.h"
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static const int TERMINAL_WIDTH = 79; /* not 80 in case terminal has linefold bug */
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#if ! defined CONFIG_FEATURE_USE_DEVPS_PATCH
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extern int ps_main(int argc, char **argv)
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{
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procps_status_t * p;
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int i, len;
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#ifdef CONFIG_FEATURE_AUTOWIDTH
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struct winsize win = { 0, 0, 0, 0 };
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int terminal_width = TERMINAL_WIDTH;
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#else
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#define terminal_width TERMINAL_WIDTH
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#endif
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#ifdef CONFIG_FEATURE_AUTOWIDTH
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ioctl(fileno(stdout), TIOCGWINSZ, &win);
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if (win.ws_col > 0)
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terminal_width = win.ws_col - 1;
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#endif
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printf(" PID Uid VmSize Stat Command\n");
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while ((p = procps_scan(1)) != 0) {
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char *namecmd = p->cmd;
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if(p->rss == 0)
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len = printf("%5d %-8s %s ", p->pid, p->user, p->state);
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else
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len = printf("%5d %-8s %6ld %s ", p->pid, p->user, p->rss, p->state);
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i = terminal_width-len;
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if(namecmd != 0 && namecmd[0] != 0) {
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if(i < 0)
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i = 0;
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if(strlen(namecmd) > i)
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namecmd[i] = 0;
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printf("%s\n", namecmd);
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} else {
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namecmd = p->short_cmd;
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if(i < 2)
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i = 2;
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if(strlen(namecmd) > (i-2))
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namecmd[i-2] = 0;
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printf("[%s]\n", namecmd);
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}
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free(p->cmd);
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}
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return EXIT_SUCCESS;
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}
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#else /* CONFIG_FEATURE_USE_DEVPS_PATCH */
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/* The following is the second ps implementation --
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* this one uses the nifty new devps kernel device.
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*/
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#include <linux/devps.h> /* For Erik's nifty devps device driver */
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extern int ps_main(int argc, char **argv)
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{
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char device[] = "/dev/ps";
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int i, j, len, fd;
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pid_t num_pids;
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pid_t* pid_array = NULL;
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struct pid_info info;
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char uidName[9];
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#ifdef CONFIG_FEATURE_AUTOWIDTH
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struct winsize win = { 0, 0, 0, 0 };
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int terminal_width = TERMINAL_WIDTH;
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#else
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#define terminal_width TERMINAL_WIDTH
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#endif
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if (argc > 1 && **(argv + 1) == '-')
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show_usage();
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/* open device */
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fd = open(device, O_RDONLY);
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if (fd < 0)
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perror_msg_and_die( "open failed for `%s'", device);
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/* Find out how many processes there are */
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if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
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perror_msg_and_die( "\nDEVPS_GET_PID_LIST");
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/* Allocate some memory -- grab a few extras just in case
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* some new processes start up while we wait. The kernel will
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* just ignore any extras if we give it too many, and will trunc.
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* the list if we give it too few. */
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pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
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pid_array[0] = num_pids+10;
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/* Now grab the pid list */
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if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
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perror_msg_and_die("\nDEVPS_GET_PID_LIST");
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#ifdef CONFIG_FEATURE_AUTOWIDTH
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ioctl(fileno(stdout), TIOCGWINSZ, &win);
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if (win.ws_col > 0)
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terminal_width = win.ws_col - 1;
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#endif
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/* Print up a ps listing */
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printf(" PID Uid Stat Command\n");
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for (i=1; i<pid_array[0] ; i++) {
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info.pid = pid_array[i];
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if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
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perror_msg_and_die("\nDEVPS_GET_PID_INFO");
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/* Make some adjustments as needed */
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my_getpwuid(uidName, info.euid);
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if(p.vmsize == 0)
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len = printf("%5d %-8s %c ", p.pid, uidName, p.state);
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else
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len = printf("%5d %-8s %6d %c ", p.pid, uidName, p.vmsize, p.state);
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if (strlen(info.command_line) > 1) {
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for( j=0; j<(sizeof(info.command_line)-1) && j < (terminal_width-len); j++) {
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if (*(info.command_line+j) == '\0' && *(info.command_line+j+1) != '\0') {
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*(info.command_line+j) = ' ';
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}
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}
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*(info.command_line+j) = '\0';
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puts(info.command_line);
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} else {
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printf("[%s]\n", info.name);
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}
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}
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/* Free memory */
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free( pid_array);
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/* close device */
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if (close (fd) != 0)
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perror_msg_and_die("close failed for `%s'", device);
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exit (0);
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}
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#endif /* CONFIG_FEATURE_USE_DEVPS_PATCH */
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