1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini pgrep/pkill implementation for busybox
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4 | *
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5 | * Copyright (C) 2007 Loic Grenie <loic.grenie@gmail.com>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 | #include "libbb.h"
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10 | #include "xregex.h"
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11 |
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12 | /* Idea taken from kill.c */
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13 | #define pgrep (ENABLE_PGREP && applet_name[1] == 'g')
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14 | #define pkill (ENABLE_PKILL && applet_name[1] == 'k')
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15 |
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16 | enum {
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17 | /* "vlfxons:P:" */
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18 | OPTBIT_V = 0, /* must be first, we need OPT_INVERT = 0/1 */
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19 | OPTBIT_L,
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20 | OPTBIT_F,
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21 | OPTBIT_X,
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22 | OPTBIT_O,
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23 | OPTBIT_N,
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24 | OPTBIT_S,
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25 | OPTBIT_P,
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26 | };
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27 |
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28 | #define OPT_INVERT (opt & (1 << OPTBIT_V))
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29 | #define OPT_LIST (opt & (1 << OPTBIT_L))
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30 | #define OPT_FULL (opt & (1 << OPTBIT_F))
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31 | #define OPT_ANCHOR (opt & (1 << OPTBIT_X))
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32 | #define OPT_FIRST (opt & (1 << OPTBIT_O))
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33 | #define OPT_LAST (opt & (1 << OPTBIT_N))
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34 | #define OPT_SID (opt & (1 << OPTBIT_S))
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35 | #define OPT_PPID (opt & (1 << OPTBIT_P))
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36 |
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37 | static void act(unsigned pid, char *cmd, int signo)
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38 | {
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39 | if (pgrep) {
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40 | if (option_mask32 & (1 << OPTBIT_L)) /* OPT_LIST */
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41 | printf("%d %s\n", pid, cmd);
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42 | else
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43 | printf("%d\n", pid);
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44 | } else
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45 | kill(pid, signo);
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46 | }
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47 |
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48 | int pgrep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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49 | int pgrep_main(int argc UNUSED_PARAM, char **argv)
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50 | {
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51 | unsigned pid;
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52 | int signo;
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53 | unsigned opt;
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54 | int scan_mask;
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55 | int matched_pid;
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56 | int sid2match, ppid2match;
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57 | char *cmd_last;
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58 | procps_status_t *proc;
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59 | /* These are initialized to 0 */
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60 | struct {
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61 | regex_t re_buffer;
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62 | regmatch_t re_match[1];
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63 | } Z;
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64 | #define re_buffer (Z.re_buffer)
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65 | #define re_match (Z.re_match )
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66 |
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67 | memset(&Z, 0, sizeof(Z));
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68 |
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69 | /* Parse -SIGNAL for pkill. Must be first option, if present */
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70 | signo = SIGTERM;
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71 | if (pkill && argv[1] && argv[1][0] == '-') {
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72 | int temp = get_signum(argv[1]+1);
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73 | if (temp != -1) {
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74 | signo = temp;
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75 | argv++;
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76 | }
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77 | }
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78 |
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79 | /* Parse remaining options */
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80 | ppid2match = -1;
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81 | sid2match = -1;
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82 | opt_complementary = "s+:P+"; /* numeric opts */
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83 | opt = getopt32(argv, "vlfxons:P:", &sid2match, &ppid2match);
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84 | argv += optind;
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85 |
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86 | if (pkill && OPT_LIST) { /* -l: print the whole signal list */
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87 | print_signames();
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88 | return 0;
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89 | }
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90 |
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91 | pid = getpid();
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92 | if (sid2match == 0)
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93 | sid2match = getsid(pid);
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94 |
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95 | scan_mask = PSSCAN_COMM | PSSCAN_ARGV0;
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96 | if (OPT_FULL)
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97 | scan_mask |= PSSCAN_ARGVN;
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98 |
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99 | /* One pattern is required, if no -s and no -P */
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100 | if ((sid2match & ppid2match) < 0 && (!argv[0] || argv[1]))
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101 | bb_show_usage();
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102 |
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103 | if (argv[0])
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104 | xregcomp(&re_buffer, argv[0], 0);
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105 |
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106 | matched_pid = 0;
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107 | cmd_last = NULL;
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108 | proc = NULL;
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109 | while ((proc = procps_scan(proc, scan_mask)) != NULL) {
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110 | char *cmd;
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111 |
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112 | if (proc->pid == pid)
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113 | continue;
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114 |
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115 | cmd = proc->argv0;
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116 | if (!cmd) {
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117 | cmd = proc->comm;
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118 | } else {
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119 | int i = proc->argv_len;
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120 | while (--i >= 0) {
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121 | if ((unsigned char)cmd[i] < ' ')
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122 | cmd[i] = ' ';
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123 | }
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124 | }
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125 |
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126 | if (ppid2match >= 0 && ppid2match != proc->ppid)
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127 | continue;
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128 | if (sid2match >= 0 && sid2match != proc->sid)
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129 | continue;
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130 |
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131 | /* NB: OPT_INVERT is always 0 or 1 */
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132 | if (!argv[0]
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133 | || (regexec(&re_buffer, cmd, 1, re_match, 0) == 0 /* match found */
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134 | && (!OPT_ANCHOR || (re_match[0].rm_so == 0 && re_match[0].rm_eo == (regoff_t)strlen(cmd)))
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135 | ) ^ OPT_INVERT
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136 | ) {
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137 | matched_pid = proc->pid;
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138 | if (OPT_LAST) {
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139 | free(cmd_last);
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140 | cmd_last = xstrdup(cmd);
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141 | continue;
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142 | }
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143 | act(proc->pid, cmd, signo);
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144 | if (OPT_FIRST)
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145 | break;
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146 | }
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147 | }
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148 |
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149 | if (cmd_last) {
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150 | act(matched_pid, cmd_last, signo);
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151 | if (ENABLE_FEATURE_CLEAN_UP)
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152 | free(cmd_last);
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153 | }
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154 | return matched_pid == 0; /* return 1 if no processes listed/signaled */
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155 | }
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