1 | /* |
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2 | * Top users/processes display for Unix |
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3 | * Version 3 |
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4 | * |
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5 | * This program may be freely redistributed, |
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6 | * but this entire comment MUST remain intact. |
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7 | * |
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8 | * Copyright (c) 1984, 1989, William LeFebvre, Rice University |
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9 | * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University |
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10 | */ |
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11 | |
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12 | /* |
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13 | * This file contains the routines that implement some of the interactive |
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14 | * mode commands. Note that some of the commands are implemented in-line |
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15 | * in "main". This is necessary because they change the global state of |
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16 | * "top" (i.e.: changing the number of processes to display). |
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17 | */ |
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18 | |
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19 | #include "os.h" |
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20 | #include <ctype.h> |
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21 | #include <signal.h> |
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22 | #include <errno.h> |
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23 | #include <sys/time.h> |
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24 | #include <sys/resource.h> |
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25 | |
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26 | #include "sigdesc.h" /* generated automatically */ |
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27 | #include "boolean.h" |
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28 | #include "utils.h" |
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29 | |
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30 | extern int errno; |
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31 | |
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32 | extern char *copyright; |
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33 | |
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34 | /* imported from screen.c */ |
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35 | extern int overstrike; |
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36 | |
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37 | int err_compar(); |
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38 | char *err_string(); |
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39 | |
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40 | /* |
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41 | * show_help() - display the help screen; invoked in response to |
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42 | * either 'h' or '?'. |
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43 | */ |
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44 | |
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45 | show_help() |
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46 | |
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47 | { |
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48 | printf("Top version %s, %s\n", version_string(), copyright); |
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49 | fputs("\n\n\ |
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50 | A top users display for Unix\n\ |
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51 | \n\ |
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52 | These single-character commands are available:\n\ |
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53 | \n\ |
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54 | ^L - redraw screen\n\ |
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55 | q - quit\n\ |
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56 | h or ? - help; show this text\n", stdout); |
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57 | |
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58 | /* not all commands are availalbe with overstrike terminals */ |
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59 | if (overstrike) |
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60 | { |
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61 | fputs("\n\ |
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62 | Other commands are also available, but this terminal is not\n\ |
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63 | sophisticated enough to handle those commands gracefully.\n\n", stdout); |
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64 | } |
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65 | else |
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66 | { |
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67 | fputs("\ |
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68 | d - change number of displays to show\n\ |
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69 | e - list errors generated by last \"kill\" or \"renice\" command\n\ |
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70 | i - toggle the displaying of idle processes\n\ |
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71 | I - same as 'i'\n\ |
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72 | k - kill processes; send a signal to a list of processes\n\ |
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73 | n or # - change number of processes to display\n", stdout); |
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74 | #ifdef ORDER |
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75 | fputs("\ |
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76 | o - specify sort order (size, res, cpu, time)\n", stdout); |
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77 | #endif |
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78 | fputs("\ |
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79 | r - renice a process\n\ |
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80 | s - change number of seconds to delay between updates\n\ |
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81 | u - display processes for only one user (+ selects all users)\n\ |
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82 | \n\ |
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83 | \n", stdout); |
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84 | } |
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85 | } |
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86 | |
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87 | /* |
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88 | * Utility routines that help with some of the commands. |
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89 | */ |
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90 | |
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91 | char *next_field(str) |
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92 | |
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93 | register char *str; |
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94 | |
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95 | { |
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96 | if ((str = strchr(str, ' ')) == NULL) |
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97 | { |
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98 | return(NULL); |
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99 | } |
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100 | *str = '\0'; |
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101 | while (*++str == ' ') /* loop */; |
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102 | |
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103 | /* if there is nothing left of the string, return NULL */ |
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104 | /* This fix is dedicated to Greg Earle */ |
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105 | return(*str == '\0' ? NULL : str); |
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106 | } |
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107 | |
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108 | scanint(str, intp) |
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109 | |
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110 | char *str; |
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111 | int *intp; |
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112 | |
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113 | { |
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114 | register int val = 0; |
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115 | register char ch; |
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116 | |
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117 | /* if there is nothing left of the string, flag it as an error */ |
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118 | /* This fix is dedicated to Greg Earle */ |
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119 | if (*str == '\0') |
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120 | { |
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121 | return(-1); |
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122 | } |
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123 | |
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124 | while ((ch = *str++) != '\0') |
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125 | { |
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126 | if (isdigit(ch)) |
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127 | { |
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128 | val = val * 10 + (ch - '0'); |
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129 | } |
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130 | else if (isspace(ch)) |
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131 | { |
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132 | break; |
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133 | } |
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134 | else |
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135 | { |
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136 | return(-1); |
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137 | } |
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138 | } |
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139 | *intp = val; |
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140 | return(0); |
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141 | } |
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142 | |
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143 | /* |
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144 | * Some of the commands make system calls that could generate errors. |
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145 | * These errors are collected up in an array of structures for later |
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146 | * contemplation and display. Such routines return a string containing an |
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147 | * error message, or NULL if no errors occurred. The next few routines are |
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148 | * for manipulating and displaying these errors. We need an upper limit on |
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149 | * the number of errors, so we arbitrarily choose 20. |
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150 | */ |
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151 | |
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152 | #define ERRMAX 20 |
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153 | |
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154 | struct errs /* structure for a system-call error */ |
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155 | { |
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156 | int errno; /* value of errno (that is, the actual error) */ |
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157 | char *arg; /* argument that caused the error */ |
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158 | }; |
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159 | |
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160 | static struct errs errs[ERRMAX]; |
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161 | static int errcnt; |
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162 | static char *err_toomany = " too many errors occurred"; |
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163 | static char *err_listem = |
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164 | " Many errors occurred. Press `e' to display the list of errors."; |
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165 | |
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166 | /* These macros get used to reset and log the errors */ |
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167 | #define ERR_RESET errcnt = 0 |
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168 | #define ERROR(p, e) if (errcnt >= ERRMAX) \ |
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169 | { \ |
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170 | return(err_toomany); \ |
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171 | } \ |
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172 | else \ |
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173 | { \ |
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174 | errs[errcnt].arg = (p); \ |
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175 | errs[errcnt++].errno = (e); \ |
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176 | } |
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177 | |
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178 | /* |
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179 | * err_string() - return an appropriate error string. This is what the |
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180 | * command will return for displaying. If no errors were logged, then |
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181 | * return NULL. The maximum length of the error string is defined by |
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182 | * "STRMAX". |
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183 | */ |
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184 | |
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185 | #define STRMAX 80 |
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186 | |
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187 | char *err_string() |
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188 | |
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189 | { |
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190 | register struct errs *errp; |
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191 | register int cnt = 0; |
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192 | register int first = Yes; |
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193 | register int currerr = -1; |
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194 | int stringlen; /* characters still available in "string" */ |
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195 | static char string[STRMAX]; |
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196 | |
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197 | /* if there are no errors, return NULL */ |
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198 | if (errcnt == 0) |
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199 | { |
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200 | return(NULL); |
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201 | } |
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202 | |
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203 | /* sort the errors */ |
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204 | qsort((char *)errs, errcnt, sizeof(struct errs), err_compar); |
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205 | |
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206 | /* need a space at the front of the error string */ |
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207 | string[0] = ' '; |
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208 | string[1] = '\0'; |
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209 | stringlen = STRMAX - 2; |
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210 | |
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211 | /* loop thru the sorted list, building an error string */ |
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212 | while (cnt < errcnt) |
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213 | { |
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214 | errp = &(errs[cnt++]); |
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215 | if (errp->errno != currerr) |
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216 | { |
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217 | if (currerr != -1) |
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218 | { |
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219 | if ((stringlen = str_adderr(string, stringlen, currerr)) < 2) |
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220 | { |
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221 | return(err_listem); |
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222 | } |
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223 | (void) strcat(string, "; "); /* we know there's more */ |
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224 | } |
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225 | currerr = errp->errno; |
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226 | first = Yes; |
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227 | } |
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228 | if ((stringlen = str_addarg(string, stringlen, errp->arg, first)) ==0) |
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229 | { |
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230 | return(err_listem); |
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231 | } |
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232 | first = No; |
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233 | } |
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234 | |
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235 | /* add final message */ |
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236 | stringlen = str_adderr(string, stringlen, currerr); |
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237 | |
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238 | /* return the error string */ |
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239 | return(stringlen == 0 ? err_listem : string); |
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240 | } |
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241 | |
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242 | /* |
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243 | * str_adderr(str, len, err) - add an explanation of error "err" to |
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244 | * the string "str". |
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245 | */ |
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246 | |
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247 | str_adderr(str, len, err) |
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248 | |
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249 | char *str; |
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250 | int len; |
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251 | int err; |
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252 | |
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253 | { |
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254 | register char *msg; |
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255 | register int msglen; |
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256 | |
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257 | msg = err == 0 ? "Not a number" : errmsg(err); |
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258 | msglen = strlen(msg) + 2; |
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259 | if (len <= msglen) |
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260 | { |
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261 | return(0); |
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262 | } |
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263 | (void) strcat(str, ": "); |
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264 | (void) strcat(str, msg); |
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265 | return(len - msglen); |
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266 | } |
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267 | |
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268 | /* |
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269 | * str_addarg(str, len, arg, first) - add the string argument "arg" to |
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270 | * the string "str". This is the first in the group when "first" |
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271 | * is set (indicating that a comma should NOT be added to the front). |
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272 | */ |
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273 | |
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274 | str_addarg(str, len, arg, first) |
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275 | |
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276 | char *str; |
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277 | int len; |
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278 | char *arg; |
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279 | int first; |
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280 | |
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281 | { |
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282 | register int arglen; |
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283 | |
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284 | arglen = strlen(arg); |
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285 | if (!first) |
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286 | { |
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287 | arglen += 2; |
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288 | } |
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289 | if (len <= arglen) |
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290 | { |
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291 | return(0); |
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292 | } |
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293 | if (!first) |
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294 | { |
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295 | (void) strcat(str, ", "); |
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296 | } |
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297 | (void) strcat(str, arg); |
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298 | return(len - arglen); |
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299 | } |
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300 | |
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301 | /* |
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302 | * err_compar(p1, p2) - comparison routine used by "qsort" |
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303 | * for sorting errors. |
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304 | */ |
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305 | |
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306 | err_compar(p1, p2) |
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307 | |
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308 | register struct errs *p1, *p2; |
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309 | |
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310 | { |
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311 | register int result; |
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312 | |
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313 | if ((result = p1->errno - p2->errno) == 0) |
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314 | { |
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315 | return(strcmp(p1->arg, p2->arg)); |
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316 | } |
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317 | return(result); |
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318 | } |
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319 | |
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320 | /* |
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321 | * error_count() - return the number of errors currently logged. |
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322 | */ |
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323 | |
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324 | error_count() |
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325 | |
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326 | { |
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327 | return(errcnt); |
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328 | } |
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329 | |
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330 | /* |
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331 | * show_errors() - display on stdout the current log of errors. |
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332 | */ |
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333 | |
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334 | show_errors() |
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335 | |
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336 | { |
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337 | register int cnt = 0; |
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338 | register struct errs *errp = errs; |
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339 | |
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340 | printf("%d error%s:\n\n", errcnt, errcnt == 1 ? "" : "s"); |
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341 | while (cnt++ < errcnt) |
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342 | { |
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343 | printf("%5s: %s\n", errp->arg, |
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344 | errp->errno == 0 ? "Not a number" : errmsg(errp->errno)); |
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345 | errp++; |
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346 | } |
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347 | } |
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348 | |
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349 | /* |
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350 | * kill_procs(str) - send signals to processes, much like the "kill" |
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351 | * command does; invoked in response to 'k'. |
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352 | */ |
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353 | |
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354 | char *kill_procs(str) |
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355 | |
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356 | char *str; |
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357 | |
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358 | { |
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359 | register char *nptr; |
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360 | int signum = SIGTERM; /* default */ |
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361 | int procnum; |
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362 | struct sigdesc *sigp; |
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363 | int uid; |
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364 | |
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365 | /* reset error array */ |
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366 | ERR_RESET; |
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367 | |
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368 | /* remember our uid */ |
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369 | uid = getuid(); |
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370 | |
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371 | /* skip over leading white space */ |
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372 | while (isspace(*str)) str++; |
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373 | |
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374 | if (str[0] == '-') |
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375 | { |
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376 | /* explicit signal specified */ |
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377 | if ((nptr = next_field(str)) == NULL) |
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378 | { |
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379 | return(" kill: no processes specified"); |
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380 | } |
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381 | |
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382 | if (isdigit(str[1])) |
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383 | { |
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384 | (void) scanint(str + 1, &signum); |
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385 | if (signum <= 0 || signum >= NSIG) |
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386 | { |
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387 | return(" invalid signal number"); |
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388 | } |
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389 | } |
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390 | else |
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391 | { |
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392 | /* translate the name into a number */ |
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393 | for (sigp = sigdesc; sigp->name != NULL; sigp++) |
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394 | { |
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395 | if (strcmp(sigp->name, str + 1) == 0) |
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396 | { |
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397 | signum = sigp->number; |
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398 | break; |
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399 | } |
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400 | } |
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401 | |
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402 | /* was it ever found */ |
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403 | if (sigp->name == NULL) |
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404 | { |
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405 | return(" bad signal name"); |
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406 | } |
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407 | } |
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408 | /* put the new pointer in place */ |
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409 | str = nptr; |
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410 | } |
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411 | |
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412 | /* loop thru the string, killing processes */ |
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413 | do |
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414 | { |
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415 | if (scanint(str, &procnum) == -1) |
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416 | { |
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417 | ERROR(str, 0); |
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418 | } |
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419 | else |
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420 | { |
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421 | /* check process owner if we're not root */ |
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422 | if (uid && (uid != proc_owner(procnum))) |
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423 | { |
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424 | ERROR(str, EACCES); |
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425 | } |
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426 | /* go in for the kill */ |
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427 | else if (kill(procnum, signum) == -1) |
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428 | { |
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429 | /* chalk up an error */ |
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430 | ERROR(str, errno); |
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431 | } |
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432 | } |
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433 | } while ((str = next_field(str)) != NULL); |
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434 | |
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435 | /* return appropriate error string */ |
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436 | return(err_string()); |
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437 | } |
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438 | |
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439 | /* |
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440 | * renice_procs(str) - change the "nice" of processes, much like the |
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441 | * "renice" command does; invoked in response to 'r'. |
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442 | */ |
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443 | |
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444 | char *renice_procs(str) |
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445 | |
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446 | char *str; |
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447 | |
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448 | { |
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449 | register char negate; |
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450 | int prio; |
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451 | int procnum; |
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452 | int uid; |
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453 | |
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454 | ERR_RESET; |
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455 | uid = getuid(); |
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456 | |
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457 | /* allow for negative priority values */ |
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458 | if ((negate = (*str == '-')) != 0) |
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459 | { |
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460 | /* move past the minus sign */ |
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461 | str++; |
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462 | } |
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463 | |
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464 | /* use procnum as a temporary holding place and get the number */ |
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465 | procnum = scanint(str, &prio); |
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466 | |
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467 | /* negate if necessary */ |
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468 | if (negate) |
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469 | { |
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470 | prio = -prio; |
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471 | } |
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472 | |
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473 | #if defined(PRIO_MIN) && defined(PRIO_MAX) |
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474 | /* check for validity */ |
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475 | if (procnum == -1 || prio < PRIO_MIN || prio > PRIO_MAX) |
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476 | { |
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477 | return(" bad priority value"); |
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478 | } |
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479 | #endif |
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480 | |
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481 | /* move to the first process number */ |
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482 | if ((str = next_field(str)) == NULL) |
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483 | { |
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484 | return(" no processes specified"); |
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485 | } |
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486 | |
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487 | /* loop thru the process numbers, renicing each one */ |
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488 | do |
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489 | { |
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490 | if (scanint(str, &procnum) == -1) |
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491 | { |
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492 | ERROR(str, 0); |
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493 | } |
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494 | |
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495 | /* check process owner if we're not root */ |
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496 | else if (uid && (uid != proc_owner(procnum))) |
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497 | { |
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498 | ERROR(str, EACCES); |
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499 | } |
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500 | else if (setpriority(PRIO_PROCESS, procnum, prio) == -1) |
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501 | { |
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502 | ERROR(str, errno); |
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503 | } |
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504 | } while ((str = next_field(str)) != NULL); |
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505 | |
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506 | /* return appropriate error string */ |
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507 | return(err_string()); |
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508 | } |
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509 | |
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