procps/ps.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini ps implementation(s) for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  19  * Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <dirent.h>
  26 #include <errno.h>
  27 #include <fcntl.h>
  28 #include <ctype.h>
  29 #include <string.h>
  30 #include <termios.h>
  31 #include <sys/ioctl.h>
  32 #include "busybox.h"
  33 #ifdef CONFIG_SELINUX
  34 #include <selinux/selinux.h>  /* for is_selinux_enabled()  */
  35 #endif
  36
  37 static const int TERMINAL_WIDTH = 79;      /* not 80 in case terminal has linefold bug */
  38
  39
  40
  41 extern int ps_main(int argc, char **argv)
  42 {
  43         procps_status_t * p;
  44         int i, len;
  45         int terminal_width = TERMINAL_WIDTH;
  46
  47 #ifdef CONFIG_SELINUX
  48         int use_selinux = 0;
  49         security_context_t sid=NULL;
  50         if(is_selinux_enabled() && argv[1] && !strcmp(argv[1], "-c") )
  51                 use_selinux = 1;
  52 #endif
  53
  54         get_terminal_width_height(0, &terminal_width, NULL);
  55         /* Go one less... */
  56         terminal_width--;
  57
  58 #ifdef CONFIG_SELINUX
  59         if (use_selinux)
  60           printf("  PID Context                          Stat Command\n");
  61         else
  62 #endif
  63           printf("  PID  Uid     VmSize Stat Command\n");
  64
  65         while ((p = procps_scan(1)) != 0)  {
  66                 char *namecmd = p->cmd;
  67 #ifdef CONFIG_SELINUX
  68                 if ( use_selinux )
  69                   {
  70                         char sbuf[128];
  71                         len = sizeof(sbuf);
  72
  73                         if (is_selinux_enabled()) {
  74                           if (getpidcon(p->pid,&sid)<0)
  75                             sid=NULL;
  76                         }
  77
  78                         if (sid) {
  79                           /*  I assume sid initilized with NULL  */
  80                           len = strlen(sid)+1;
  81                           safe_strncpy(sbuf, sid, len);
  82                           freecon(sid);
  83                           sid=NULL;
  84                         }else {
  85                           safe_strncpy(sbuf, "unknown",7);
  86                         }
  87                         len = printf("%5d %-32s %s ", p->pid, sbuf, p->state);
  88                 }
  89                 else
  90 #endif
  91                   if(p->rss == 0)
  92                     len = printf("%5d %-8s        %s ", p->pid, p->user, p->state);
  93                   else
  94                     len = printf("%5d %-8s %6ld %s ", p->pid, p->user, p->rss, p->state);
  95                 i = terminal_width-len;
  96
  97                 if(namecmd != 0 && namecmd[0] != 0) {
  98                         if(i < 0)
  99                 i = 0;
 100                         if(strlen(namecmd) > i)
 101                                 namecmd[i] = 0;
 102                         printf("%s\n", namecmd);
 103                 } else {
 104                         namecmd = p->short_cmd;
 105                         if(i < 2)
 106                                 i = 2;
 107                         if(strlen(namecmd) > (i-2))
 108                                 namecmd[i-2] = 0;
 109                         printf("[%s]\n", namecmd);
 110                 }
 111                 free(p->cmd);
 112         }
 113         return EXIT_SUCCESS;
 114 }
 115