1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright 1998 by Albert Cahalan; all rights reserved.
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6 | * Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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9 | */
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10 |
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11 | #include <dirent.h>
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12 | #include <string.h>
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13 | #include <stdlib.h>
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14 | #include <sys/param.h>
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15 | #include <unistd.h>
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16 | #include <fcntl.h>
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17 |
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18 | #include "libbb.h"
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19 |
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20 |
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21 | #define PROCPS_BUFSIZE 1024
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22 |
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23 | static int read_to_buf(const char *filename, void *buf)
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24 | {
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25 | int fd;
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26 | ssize_t ret;
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27 |
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28 | fd = open(filename, O_RDONLY);
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29 | if(fd < 0)
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30 | return -1;
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31 | ret = read(fd, buf, PROCPS_BUFSIZE-1);
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32 | ((char *)buf)[ret > 0 ? ret : 0] = 0;
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33 | close(fd);
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34 | return ret;
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35 | }
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36 |
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37 |
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38 | procps_status_t * procps_scan(int save_user_arg0)
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39 | {
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40 | static DIR *dir;
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41 | struct dirent *entry;
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42 | static procps_status_t ret_status;
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43 | char *name;
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44 | int n;
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45 | char status[32];
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46 | char *status_tail;
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47 | char buf[PROCPS_BUFSIZE];
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48 | procps_status_t curstatus;
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49 | int pid;
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50 | long tasknice;
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51 | struct stat sb;
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52 |
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53 | if (!dir) {
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54 | dir = bb_xopendir("/proc");
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55 | }
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56 | for(;;) {
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57 | if((entry = readdir(dir)) == NULL) {
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58 | closedir(dir);
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59 | dir = 0;
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60 | return 0;
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61 | }
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62 | name = entry->d_name;
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63 | if (!(*name >= '0' && *name <= '9'))
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64 | continue;
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65 |
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66 | memset(&curstatus, 0, sizeof(procps_status_t));
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67 | pid = atoi(name);
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68 | curstatus.pid = pid;
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69 |
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70 | status_tail = status + sprintf(status, "/proc/%d", pid);
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71 | if(stat(status, &sb))
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72 | continue;
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73 | bb_getpwuid(curstatus.user, sb.st_uid, sizeof(curstatus.user));
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74 |
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75 | /* see proc(5) for some details on this */
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76 | strcpy(status_tail, "/stat");
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77 | n = read_to_buf(status, buf);
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78 | if(n < 0)
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79 | continue;
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80 | name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
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81 | if(name == 0 || name[1] != ' ')
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82 | continue;
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83 | *name = 0;
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84 | sscanf(buf, "%*s (%15c", curstatus.short_cmd);
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85 | n = sscanf(name+2,
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86 | "%c %d "
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87 | "%*s %*s %*s %*s " /* pgrp, session, tty, tpgid */
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88 | "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
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89 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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90 | "%lu %lu " /* utime, stime */
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91 | #else
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92 | "%*s %*s " /* utime, stime */
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93 | #endif
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94 | "%*s %*s %*s " /* cutime, cstime, priority */
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95 | "%ld " /* nice */
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96 | "%*s %*s %*s " /* timeout, it_real_value, start_time */
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97 | "%*s " /* vsize */
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98 | "%ld", /* rss */
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99 | curstatus.state, &curstatus.ppid,
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100 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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101 | &curstatus.utime, &curstatus.stime,
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102 | #endif
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103 | &tasknice,
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104 | &curstatus.rss);
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105 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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106 | if(n != 6)
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107 | #else
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108 | if(n != 4)
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109 | #endif
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110 | continue;
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111 |
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112 | if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
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113 | curstatus.state[1] = 'W';
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114 | else
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115 | curstatus.state[1] = ' ';
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116 | if (tasknice < 0)
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117 | curstatus.state[2] = '<';
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118 | else if (tasknice > 0)
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119 | curstatus.state[2] = 'N';
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120 | else
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121 | curstatus.state[2] = ' ';
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122 |
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123 | #ifdef PAGE_SHIFT
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124 | curstatus.rss <<= (PAGE_SHIFT - 10); /* 2**10 = 1kb */
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125 | #else
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126 | curstatus.rss *= (getpagesize() >> 10); /* 2**10 = 1kb */
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127 | #endif
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128 |
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129 | if(save_user_arg0) {
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130 | strcpy(status_tail, "/cmdline");
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131 | n = read_to_buf(status, buf);
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132 | if(n > 0) {
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133 | if(buf[n-1]=='\n')
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134 | buf[--n] = 0;
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135 | name = buf;
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136 | while(n) {
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137 | if(((unsigned char)*name) < ' ')
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138 | *name = ' ';
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139 | name++;
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140 | n--;
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141 | }
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142 | *name = 0;
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143 | if(buf[0])
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144 | curstatus.cmd = strdup(buf);
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145 | /* if NULL it work true also */
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146 | }
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147 | }
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148 | return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
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149 | }
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150 | }
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