1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini kill/killall[5] implementation for busybox
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4 | *
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5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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9 | */
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10 |
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11 | #include "libbb.h"
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12 |
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13 | /* Note: kill_main is directly called from shell in order to implement
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14 | * kill built-in. Shell substitutes job ids with process groups first.
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15 | *
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16 | * This brings some complications:
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17 | *
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18 | * + we can't use xfunc here
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19 | * + we can't use applet_name
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20 | * + we can't use bb_show_usage
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21 | * (Above doesn't apply for killall[5] cases)
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22 | *
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23 | * kill %n gets translated into kill ' -<process group>' by shell (note space!)
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24 | * This is needed to avoid collision with kill -9 ... syntax
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25 | */
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26 |
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27 | int kill_main(int argc, char **argv)
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28 | {
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29 | char *arg;
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30 | pid_t pid;
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31 | int signo = SIGTERM, errors = 0, quiet = 0;
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32 | #if !ENABLE_KILLALL && !ENABLE_KILLALL5
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33 | #define killall 0
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34 | #define killall5 0
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35 | #else
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36 | /* How to determine who we are? find 3rd char from the end:
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37 | * kill, killall, killall5
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38 | * ^i ^a ^l - it's unique
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39 | * (checking from the start is complicated by /bin/kill... case) */
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40 | const char char3 = argv[0][strlen(argv[0]) - 3];
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41 | #define killall (ENABLE_KILLALL && char3 == 'a')
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42 | #define killall5 (ENABLE_KILLALL5 && char3 == 'l')
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43 | #endif
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44 |
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45 | /* Parse any options */
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46 | argc--;
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47 | arg = *++argv;
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48 |
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49 | if (argc < 1 || arg[0] != '-') {
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50 | goto do_it_now;
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51 | }
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52 |
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53 | /* The -l option, which prints out signal names.
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54 | * Intended usage in shell:
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55 | * echo "Died of SIG`kill -l $?`"
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56 | * We try to mimic what kill from coreutils-6.8 does */
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57 | if (arg[1] == 'l' && arg[2] == '\0') {
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58 | if (argc == 1) {
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59 | /* Print the whole signal list */
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60 | print_signames();
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61 | return 0;
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62 | }
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63 | /* -l <sig list> */
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64 | while ((arg = *++argv)) {
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65 | if (isdigit(arg[0])) {
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66 | signo = bb_strtou(arg, NULL, 10);
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67 | if (errno) {
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68 | bb_error_msg("unknown signal '%s'", arg);
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69 | return EXIT_FAILURE;
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70 | }
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71 | /* Exitcodes >= 0x80 are to be treated
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72 | * as "killed by signal (exitcode & 0x7f)" */
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73 | puts(get_signame(signo & 0x7f));
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74 | /* TODO: 'bad' signal# - coreutils says:
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75 | * kill: 127: invalid signal
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76 | * we just print "127" instead */
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77 | } else {
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78 | signo = get_signum(arg);
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79 | if (signo < 0) {
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80 | bb_error_msg("unknown signal '%s'", arg);
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81 | return EXIT_FAILURE;
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82 | }
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83 | printf("%d\n", signo);
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84 | }
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85 | }
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86 | /* If they specified -l, we are all done */
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87 | return EXIT_SUCCESS;
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88 | }
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89 |
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90 | /* The -q quiet option */
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91 | if (killall && arg[1] == 'q' && arg[2] == '\0') {
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92 | quiet = 1;
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93 | arg = *++argv;
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94 | argc--;
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95 | if (argc < 1)
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96 | bb_show_usage();
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97 | if (arg[0] != '-')
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98 | goto do_it_now;
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99 | }
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100 |
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101 | arg++; /* skip '-' */
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102 |
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103 | /* -o PID? (if present, it always is at the end of command line) */
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104 | if (killall5 && arg[0] == 'o')
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105 | goto do_it_now;
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106 |
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107 | if (argc > 1 && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */
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108 | argc--;
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109 | arg = *++argv;
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110 | } /* else it must be -SIG */
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111 | signo = get_signum(arg);
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112 | if (signo < 0) { /* || signo > MAX_SIGNUM ? */
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113 | bb_error_msg("bad signal name '%s'", arg);
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114 | return EXIT_FAILURE;
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115 | }
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116 | arg = *++argv;
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117 | argc--;
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118 |
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119 | do_it_now:
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120 | pid = getpid();
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121 |
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122 | if (killall5) {
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123 | pid_t sid;
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124 | procps_status_t* p = NULL;
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125 | int ret = 0;
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126 |
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127 | /* Find out our session id */
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128 | sid = getsid(pid);
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129 | /* Stop all processes */
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130 | kill(-1, SIGSTOP);
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131 | /* Signal all processes except those in our session */
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132 | while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID))) {
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133 | int i;
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134 |
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135 | if (p->sid == (unsigned)sid
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136 | || p->pid == (unsigned)pid
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137 | || p->pid == 1)
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138 | continue;
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139 |
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140 | /* All remaining args must be -o PID options.
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141 | * Check p->pid against them. */
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142 | for (i = 0; i < argc; i++) {
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143 | pid_t omit;
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144 |
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145 | arg = argv[i];
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146 | if (arg[0] != '-' || arg[1] != 'o') {
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147 | bb_error_msg("bad option '%s'", arg);
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148 | ret = 1;
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149 | goto resume;
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150 | }
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151 | arg += 2;
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152 | if (!arg[0] && argv[++i])
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153 | arg = argv[i];
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154 | omit = bb_strtoi(arg, NULL, 10);
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155 | if (errno) {
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156 | bb_error_msg("invalid number '%s'", arg);
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157 | ret = 1;
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158 | goto resume;
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159 | }
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160 | if (p->pid == omit)
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161 | goto dont_kill;
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162 | }
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163 | kill(p->pid, signo);
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164 | dont_kill: ;
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165 | }
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166 | resume:
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167 | /* And let them continue */
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168 | kill(-1, SIGCONT);
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169 | return ret;
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170 | }
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171 |
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172 | /* Pid or name is required for kill/killall */
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173 | if (argc < 1) {
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174 | bb_error_msg("you need to specify whom to kill");
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175 | return EXIT_FAILURE;
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176 | }
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177 |
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178 | if (killall) {
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179 | /* Looks like they want to do a killall. Do that */
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180 | while (arg) {
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181 | pid_t* pidList;
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182 |
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183 | pidList = find_pid_by_name(arg);
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184 | if (*pidList == 0) {
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185 | errors++;
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186 | if (!quiet)
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187 | bb_error_msg("%s: no process killed", arg);
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188 | } else {
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189 | pid_t *pl;
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190 |
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191 | for (pl = pidList; *pl; pl++) {
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192 | if (*pl == pid)
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193 | continue;
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194 | if (kill(*pl, signo) == 0)
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195 | continue;
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196 | errors++;
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197 | if (!quiet)
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198 | bb_perror_msg("can't kill pid %d", (int)*pl);
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199 | }
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200 | }
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201 | free(pidList);
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202 | arg = *++argv;
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203 | }
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204 | return errors;
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205 | }
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206 |
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207 | /* Looks like they want to do a kill. Do that */
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208 | while (arg) {
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209 | /* Support shell 'space' trick */
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210 | if (arg[0] == ' ')
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211 | arg++;
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212 | pid = bb_strtoi(arg, NULL, 10);
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213 | if (errno) {
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214 | bb_error_msg("invalid number '%s'", arg);
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215 | errors++;
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216 | } else if (kill(pid, signo) != 0) {
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217 | bb_perror_msg("can't kill pid %d", (int)pid);
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218 | errors++;
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219 | }
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220 | arg = *++argv;
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221 | }
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222 | return errors;
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223 | }
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