1 | /*
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2 | Copyright (c) 2001-2006, Gerrit Pape
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3 | All rights reserved.
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4 |
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5 | Redistribution and use in source and binary forms, with or without
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6 | modification, are permitted provided that the following conditions are met:
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7 |
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8 | 1. Redistributions of source code must retain the above copyright notice,
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9 | this list of conditions and the following disclaimer.
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10 | 2. Redistributions in binary form must reproduce the above copyright
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11 | notice, this list of conditions and the following disclaimer in the
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12 | documentation and/or other materials provided with the distribution.
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13 | 3. The name of the author may not be used to endorse or promote products
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14 | derived from this software without specific prior written permission.
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15 |
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16 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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19 | EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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22 | OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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23 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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24 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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25 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 | */
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27 |
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28 | /* Busyboxed by Denis Vlasenko <vda.linux@googlemail.com> */
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29 | /* TODO: depends on runit_lib.c - review and reduce/eliminate */
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30 |
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31 | #include <sys/poll.h>
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32 | #include <sys/file.h>
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33 | #include "libbb.h"
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34 | #include "runit_lib.h"
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35 |
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36 | #define MAXSERVICES 1000
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37 |
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38 | struct service {
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39 | dev_t dev;
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40 | ino_t ino;
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41 | pid_t pid;
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42 | smallint isgone;
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43 | };
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44 |
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45 | struct service *sv;
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46 | static char *svdir;
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47 | static int svnum;
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48 | static char *rplog;
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49 | static int rploglen;
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50 | static int logpipe[2];
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51 | static struct pollfd pfd[1];
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52 | static unsigned stamplog;
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53 | static smallint check = 1;
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54 | static smallint exitsoon;
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55 | static smallint set_pgrp;
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56 |
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57 | static void fatal2_cannot(const char *m1, const char *m2)
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58 | {
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59 | bb_perror_msg_and_die("%s: fatal: cannot %s%s", svdir, m1, m2);
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60 | /* was exiting 100 */
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61 | }
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62 | static void warn3x(const char *m1, const char *m2, const char *m3)
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63 | {
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64 | bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
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65 | }
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66 | static void warn2_cannot(const char *m1, const char *m2)
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67 | {
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68 | warn3x("cannot ", m1, m2);
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69 | }
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70 | static void warnx(const char *m1)
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71 | {
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72 | warn3x(m1, "", "");
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73 | }
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74 |
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75 | static void s_term(int sig_no)
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76 | {
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77 | exitsoon = 1;
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78 | }
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79 | static void s_hangup(int sig_no)
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80 | {
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81 | exitsoon = 2;
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82 | }
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83 |
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84 | static void runsv(int no, const char *name)
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85 | {
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86 | pid_t pid;
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87 | char *prog[3];
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88 |
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89 | prog[0] = (char*)"runsv";
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90 | prog[1] = (char*)name;
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91 | prog[2] = NULL;
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92 |
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93 | pid = vfork();
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94 |
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95 | if (pid == -1) {
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96 | warn2_cannot("vfork", "");
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97 | return;
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98 | }
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99 | if (pid == 0) {
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100 | /* child */
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101 | if (set_pgrp)
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102 | setsid();
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103 | signal(SIGHUP, SIG_DFL);
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104 | signal(SIGTERM, SIG_DFL);
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105 | execvp(prog[0], prog);
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106 | fatal2_cannot("start runsv ", name);
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107 | }
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108 | sv[no].pid = pid;
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109 | }
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110 |
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111 | static void runsvdir(void)
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112 | {
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113 | DIR *dir;
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114 | direntry *d;
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115 | int i;
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116 | struct stat s;
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117 |
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118 | dir = opendir(".");
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119 | if (!dir) {
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120 | warn2_cannot("open directory ", svdir);
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121 | return;
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122 | }
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123 | for (i = 0; i < svnum; i++)
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124 | sv[i].isgone = 1;
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125 | errno = 0;
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126 | while ((d = readdir(dir))) {
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127 | if (d->d_name[0] == '.')
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128 | continue;
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129 | if (stat(d->d_name, &s) == -1) {
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130 | warn2_cannot("stat ", d->d_name);
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131 | errno = 0;
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132 | continue;
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133 | }
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134 | if (!S_ISDIR(s.st_mode))
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135 | continue;
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136 | for (i = 0; i < svnum; i++) {
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137 | if ((sv[i].ino == s.st_ino) && (sv[i].dev == s.st_dev)) {
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138 | sv[i].isgone = 0;
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139 | if (!sv[i].pid)
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140 | runsv(i, d->d_name);
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141 | break;
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142 | }
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143 | }
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144 | if (i == svnum) {
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145 | /* new service */
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146 | struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
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147 | if (!svnew) {
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148 | warn3x("cannot start runsv ", d->d_name,
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149 | " too many services");
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150 | continue;
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151 | }
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152 | sv = svnew;
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153 | svnum++;
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154 | memset(&sv[i], 0, sizeof(sv[i]));
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155 | sv[i].ino = s.st_ino;
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156 | sv[i].dev = s.st_dev;
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157 | /*sv[i].pid = 0;*/
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158 | /*sv[i].isgone = 0;*/
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159 | runsv(i, d->d_name);
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160 | check = 1;
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161 | }
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162 | }
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163 | if (errno) {
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164 | warn2_cannot("read directory ", svdir);
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165 | closedir(dir);
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166 | check = 1;
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167 | return;
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168 | }
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169 | closedir(dir);
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170 |
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171 | /* SIGTERM removed runsv's */
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172 | for (i = 0; i < svnum; i++) {
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173 | if (!sv[i].isgone)
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174 | continue;
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175 | if (sv[i].pid)
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176 | kill(sv[i].pid, SIGTERM);
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177 | sv[i] = sv[--svnum];
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178 | check = 1;
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179 | }
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180 | }
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181 |
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182 | static int setup_log(void)
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183 | {
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184 | rploglen = strlen(rplog);
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185 | if (rploglen < 7) {
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186 | warnx("log must have at least seven characters");
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187 | return 0;
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188 | }
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189 | if (pipe(logpipe)) {
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190 | warnx("cannot create pipe for log");
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191 | return -1;
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192 | }
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193 | coe(logpipe[1]);
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194 | coe(logpipe[0]);
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195 | ndelay_on(logpipe[0]);
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196 | ndelay_on(logpipe[1]);
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197 | if (dup2(logpipe[1], 2) == -1) {
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198 | warnx("cannot set filedescriptor for log");
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199 | return -1;
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200 | }
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201 | pfd[0].fd = logpipe[0];
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202 | pfd[0].events = POLLIN;
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203 | stamplog = monotonic_sec();
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204 | return 1;
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205 | }
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206 |
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207 | int runsvdir_main(int argc, char **argv);
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208 | int runsvdir_main(int argc, char **argv)
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209 | {
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210 | struct stat s;
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211 | dev_t last_dev = last_dev; /* for gcc */
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212 | ino_t last_ino = last_ino; /* for gcc */
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213 | time_t last_mtime = 0;
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214 | int wstat;
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215 | int curdir;
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216 | int pid;
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217 | unsigned deadline;
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218 | unsigned now;
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219 | unsigned stampcheck;
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220 | char ch;
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221 | int i;
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222 |
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223 | argv++;
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224 | if (!*argv)
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225 | bb_show_usage();
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226 | if (argv[0][0] == '-') {
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227 | switch (argv[0][1]) {
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228 | case 'P': set_pgrp = 1;
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229 | case '-': ++argv;
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230 | }
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231 | if (!*argv)
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232 | bb_show_usage();
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233 | }
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234 |
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235 | sig_catch(SIGTERM, s_term);
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236 | sig_catch(SIGHUP, s_hangup);
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237 | svdir = *argv++;
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238 | if (argv && *argv) {
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239 | rplog = *argv;
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240 | if (setup_log() != 1) {
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241 | rplog = 0;
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242 | warnx("log service disabled");
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243 | }
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244 | }
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245 | curdir = open_read(".");
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246 | if (curdir == -1)
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247 | fatal2_cannot("open current directory", "");
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248 | coe(curdir);
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249 |
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250 | stampcheck = monotonic_sec();
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251 |
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252 | for (;;) {
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253 | /* collect children */
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254 | for (;;) {
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255 | pid = wait_nohang(&wstat);
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256 | if (pid <= 0)
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257 | break;
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258 | for (i = 0; i < svnum; i++) {
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259 | if (pid == sv[i].pid) {
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260 | /* runsv has gone */
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261 | sv[i].pid = 0;
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262 | check = 1;
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263 | break;
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264 | }
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265 | }
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266 | }
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267 |
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268 | now = monotonic_sec();
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269 | if ((int)(now - stampcheck) >= 0) {
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270 | /* wait at least a second */
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271 | stampcheck = now + 1;
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272 |
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273 | if (stat(svdir, &s) != -1) {
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274 | if (check || s.st_mtime != last_mtime
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275 | || s.st_ino != last_ino || s.st_dev != last_dev
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276 | ) {
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277 | /* svdir modified */
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278 | if (chdir(svdir) != -1) {
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279 | last_mtime = s.st_mtime;
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280 | last_dev = s.st_dev;
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281 | last_ino = s.st_ino;
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282 | check = 0;
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283 | //if (now <= mtime)
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284 | // sleep(1);
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285 | runsvdir();
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286 | while (fchdir(curdir) == -1) {
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287 | warn2_cannot("change directory, pausing", "");
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288 | sleep(5);
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289 | }
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290 | } else
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291 | warn2_cannot("change directory to ", svdir);
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292 | }
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293 | } else
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294 | warn2_cannot("stat ", svdir);
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295 | }
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296 |
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297 | if (rplog) {
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298 | if ((int)(now - stamplog) >= 0) {
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299 | write(logpipe[1], ".", 1);
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300 | stamplog = now + 900;
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301 | }
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302 | }
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303 |
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304 | pfd[0].revents = 0;
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305 | sig_block(SIGCHLD);
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306 | deadline = (check ? 1 : 5);
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307 | if (rplog)
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308 | poll(pfd, 1, deadline*1000);
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309 | else
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310 | sleep(deadline);
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311 | sig_unblock(SIGCHLD);
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312 |
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313 | if (pfd[0].revents & POLLIN) {
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314 | while (read(logpipe[0], &ch, 1) > 0) {
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315 | if (ch) {
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316 | for (i = 6; i < rploglen; i++)
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317 | rplog[i-1] = rplog[i];
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318 | rplog[rploglen-1] = ch;
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319 | }
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320 | }
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321 | }
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322 |
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323 | switch (exitsoon) {
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324 | case 1:
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325 | _exit(0);
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326 | case 2:
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327 | for (i = 0; i < svnum; i++)
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328 | if (sv[i].pid)
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329 | kill(sv[i].pid, SIGTERM);
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330 | _exit(111);
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331 | }
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332 | }
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333 | /* not reached */
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334 | return 0;
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335 | }
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