[1765] | 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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