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 the GPL v2 or later, see the file LICENSE in this tarball.
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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 | int kill_main(int argc, char **argv)
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29 | {
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30 | char *arg;
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31 | pid_t pid;
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32 | int signo = SIGTERM, errors = 0, quiet = 0;
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33 | #if !ENABLE_KILLALL && !ENABLE_KILLALL5
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34 | #define killall 0
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35 | #define killall5 0
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36 | #else
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37 | /* How to determine who we are? find 3rd char from the end:
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38 | * kill, killall, killall5
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39 | * ^i ^a ^l - it's unique
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40 | * (checking from the start is complicated by /bin/kill... case) */
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41 | const char char3 = argv[0][strlen(argv[0]) - 3];
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42 | #define killall (ENABLE_KILLALL && char3 == 'a')
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43 | #define killall5 (ENABLE_KILLALL5 && char3 == 'l')
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44 | #endif
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45 |
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46 | /* Parse any options */
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47 | argc--;
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48 | arg = *++argv;
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49 |
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50 | if (argc < 1 || arg[0] != '-') {
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51 | goto do_it_now;
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52 | }
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53 |
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54 | /* The -l option, which prints out signal names.
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55 | * Intended usage in shell:
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56 | * echo "Died of SIG`kill -l $?`"
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57 | * We try to mimic what kill from coreutils-6.8 does */
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58 | if (arg[1] == 'l' && arg[2] == '\0') {
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59 | if (argc == 1) {
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60 | /* Print the whole signal list */
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61 | for (signo = 1; signo < 32; signo++) {
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62 | const char *name = get_signame(signo);
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63 | if (!isdigit(name[0]))
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64 | puts(name);
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65 | }
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66 | } else { /* -l <sig list> */
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67 | while ((arg = *++argv)) {
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68 | if (isdigit(arg[0])) {
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69 | signo = bb_strtou(arg, NULL, 10);
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70 | if (errno) {
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71 | bb_error_msg("unknown signal '%s'", arg);
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72 | return EXIT_FAILURE;
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73 | }
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74 | /* Exitcodes >= 0x80 are to be treated
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75 | * as "killed by signal (exitcode & 0x7f)" */
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76 | puts(get_signame(signo & 0x7f));
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77 | /* TODO: 'bad' signal# - coreutils says:
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78 | * kill: 127: invalid signal
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79 | * we just print "127" instead */
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80 | } else {
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81 | signo = get_signum(arg);
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82 | if (signo < 0) {
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83 | bb_error_msg("unknown signal '%s'", arg);
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84 | return EXIT_FAILURE;
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85 | }
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86 | printf("%d\n", signo);
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87 | }
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88 | }
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89 | }
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90 | /* If they specified -l, we are all done */
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91 | return EXIT_SUCCESS;
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92 | }
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93 |
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94 | /* The -q quiet option */
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95 | if (killall && arg[1] == 'q' && arg[2] == '\0') {
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96 | quiet = 1;
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97 | arg = *++argv;
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98 | argc--;
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99 | if (argc < 1) bb_show_usage();
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100 | if (arg[0] != '-') goto do_it_now;
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101 | }
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102 |
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103 | /* -SIG */
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104 | signo = get_signum(&arg[1]);
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105 | if (signo < 0) { /* || signo > MAX_SIGNUM ? */
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106 | bb_error_msg("bad signal name '%s'", &arg[1]);
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107 | return EXIT_FAILURE;
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108 | }
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109 | arg = *++argv;
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110 | argc--;
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111 |
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112 | do_it_now:
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113 |
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114 | if (killall5) {
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115 | pid_t sid;
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116 | procps_status_t* p = NULL;
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117 |
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118 | /* Now stop all processes */
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119 | kill(-1, SIGSTOP);
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120 | /* Find out our own session id */
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121 | pid = getpid();
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122 | sid = getsid(pid);
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123 | /* Now kill all processes except our session */
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124 | while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID))) {
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125 | if (p->sid != sid && p->pid != pid && p->pid != 1)
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126 | kill(p->pid, signo);
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127 | }
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128 | /* And let them continue */
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129 | kill(-1, SIGCONT);
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130 | return 0;
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131 | }
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132 |
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133 | /* Pid or name is required for kill/killall */
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134 | if (argc < 1) {
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135 | puts("You need to specify whom to kill");
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136 | return EXIT_FAILURE;
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137 | }
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138 |
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139 | if (killall) {
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140 | /* Looks like they want to do a killall. Do that */
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141 | pid = getpid();
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142 | while (arg) {
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143 | pid_t* pidList;
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144 |
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145 | pidList = find_pid_by_name(arg);
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146 | if (*pidList == 0) {
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147 | errors++;
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148 | if (!quiet)
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149 | bb_error_msg("%s: no process killed", arg);
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150 | } else {
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151 | pid_t *pl;
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152 |
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153 | for (pl = pidList; *pl; pl++) {
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154 | if (*pl == pid)
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155 | continue;
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156 | if (kill(*pl, signo) == 0)
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157 | continue;
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158 | errors++;
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159 | if (!quiet)
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160 | bb_perror_msg("cannot kill pid %u", (unsigned)*pl);
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161 | }
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162 | }
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163 | free(pidList);
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164 | arg = *++argv;
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165 | }
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166 | return errors;
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167 | }
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168 |
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169 | /* Looks like they want to do a kill. Do that */
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170 | while (arg) {
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171 | /* Support shell 'space' trick */
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172 | if (arg[0] == ' ')
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173 | arg++;
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174 | pid = bb_strtoi(arg, NULL, 10);
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175 | if (errno) {
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176 | bb_error_msg("bad pid '%s'", arg);
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177 | errors++;
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178 | } else if (kill(pid, signo) != 0) {
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179 | bb_perror_msg("cannot kill pid %d", (int)pid);
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180 | errors++;
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181 | }
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182 | arg = *++argv;
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183 | }
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184 | return errors;
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185 | }
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