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  * Licensed under the GPL v2, see the file LICENSE in this tarball.
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <dirent.h>
  14 #include <errno.h>
  15 #include <fcntl.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #include <termios.h>
  19 #include <sys/ioctl.h>
  20 #include "busybox.h"
  21 #if ENABLE_SELINUX
  22 #include <selinux/selinux.h>  /* for is_selinux_enabled()  */
  23 #endif
  24
  25 #define TERMINAL_WIDTH 80
  26
  27 extern int ps_main(int argc, char **argv)
  28 {
  29         procps_status_t * p;
  30         int i, len, terminal_width;
  31 #if ENABLE_SELINUX
  32         int use_selinux = 0;
  33         security_context_t sid=NULL;
  34 #endif
  35
  36         get_terminal_width_height(0, &terminal_width, NULL);
  37
  38 #if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
  39         /* handle arguments */
  40         /* bb_getopt_ulflags(argc, argv,) would force a leading dash */
  41         for (len = 1; len < argc; len++) {
  42                 char *c = argv[len];
  43                 while (*c) {
  44                         if (ENABLE_FEATURE_PS_WIDE && *c == 'w')
  45                                 /* if w is given once, GNU ps sets the width to 132,
  46                                  * if w is given more than once, it is "unlimited"
  47                                  */
  48                                 terminal_width =
  49                                         (terminal_width==TERMINAL_WIDTH) ? 132 : INT_MAX;
  50 #if ENABLE_SELINUX
  51                         if (*c == 'c' && is_selinux_enabled())
  52                                 use_selinux = 1;
  53 #endif
  54                         c++;
  55                 }
  56         }
  57 #endif
  58
  59         /* Go one less... */
  60         terminal_width--;
  61 #if ENABLE_SELINUX
  62         if (use_selinux)
  63           printf("  PID Context                          Stat Command\n");
  64         else
  65 #endif
  66           printf("  PID  Uid     VmSize Stat Command\n");
  67
  68         while ((p = procps_scan(1)) != 0)  {
  69                 char *namecmd = p->cmd;
  70 #if ENABLE_SELINUX
  71                 if (use_selinux )
  72                   {
  73                         char sbuf[128];
  74                         len = sizeof(sbuf);
  75
  76                         if (is_selinux_enabled()) {
  77                           if (getpidcon(p->pid,&sid)<0)
  78                             sid=NULL;
  79                         }
  80
  81                         if (sid) {
  82                           /*  I assume sid initilized with NULL  */
  83                           len = strlen(sid)+1;
  84                           safe_strncpy(sbuf, sid, len);
  85                           freecon(sid);
  86                           sid=NULL;
  87                         }else {
  88                           safe_strncpy(sbuf, "unknown",7);
  89                         }
  90                         len = printf("%5d %-32s %s ", p->pid, sbuf, p->state);
  91                 }
  92                 else
  93 #endif
  94                   if(p->rss == 0)
  95                     len = printf("%5d %-8s        %s ", p->pid, p->user, p->state);
  96                   else
  97                     len = printf("%5d %-8s %6ld %s ", p->pid, p->user, p->rss, p->state);
  98
  99                 i = terminal_width-len;
 100
 101                 if(namecmd && namecmd[0]) {
 102                         if(i < 0)
 103                                 i = 0;
 104                         if(strlen(namecmd) > i)
 105                                 namecmd[i] = 0;
 106                         printf("%s\n", namecmd);
 107                 } else {
 108                         namecmd = p->short_cmd;
 109                         if(i < 2)
 110                                 i = 2;
 111                         if(strlen(namecmd) > (i-2))
 112                                 namecmd[i-2] = 0;
 113                         printf("[%s]\n", namecmd);
 114                 }
 115                 /* no check needed, but to make valgrind happy..  */
 116                 if (ENABLE_FEATURE_CLEAN_UP && p->cmd)
 117                         free(p->cmd);
 118         }
 119         return EXIT_SUCCESS;
 120 }
 121