forgot about avn add... :(
This commit is contained in:
Denis Vlasenko
306
runit/runsvdir.c
Normal file
306
runit/runsvdir.c
Normal file
@@ -0,0 +1,306 @@
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/* Busyboxed by Denis Vlasenko <vda.linux@googlemail.com> */
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/* TODO: depends on runit_lib.c - review and reduce/eliminate */
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#include <sys/poll.h>
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#include <sys/file.h>
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#include "busybox.h"
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#include "runit_lib.h"
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#define MAXSERVICES 1000
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static char *svdir;
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static unsigned long dev;
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static unsigned long ino;
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static struct service {
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unsigned long dev;
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unsigned long ino;
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int pid;
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int isgone;
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} *sv;
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static int svnum;
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static int check = 1;
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static char *rplog;
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static int rploglen;
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static int logpipe[2];
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static iopause_fd io[1];
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static struct taia stamplog;
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static int exitsoon;
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static int pgrp;
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#define usage() bb_show_usage()
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static void fatal2_cannot(char *m1, char *m2)
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{
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bb_perror_msg_and_die("%s: fatal: cannot %s%s", svdir, m1, m2);
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/* was exiting 100 */
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}
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static void warn3x(char *m1, char *m2, char *m3)
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{
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bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
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}
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static void warn2_cannot(char *m1, char *m2)
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{
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warn3x("cannot ", m1, m2);
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}
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static void warnx(char *m1)
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{
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warn3x(m1, "", "");
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}
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static void s_term(int sig_no)
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{
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exitsoon = 1;
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}
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static void s_hangup(int sig_no)
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{
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exitsoon = 2;
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}
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static void runsv(int no, char *name)
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{
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int pid = fork();
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if (pid == -1) {
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warn2_cannot("fork for ", name);
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return;
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}
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if (pid == 0) {
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/* child */
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char *prog[3];
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prog[0] = "runsv";
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prog[1] = name;
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prog[2] = 0;
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sig_uncatch(sig_hangup);
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sig_uncatch(sig_term);
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if (pgrp) setsid();
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execvp(prog[0], prog);
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//pathexec_run(*prog, prog, (char* const*)environ);
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fatal2_cannot("start runsv ", name);
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}
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sv[no].pid = pid;
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}
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static void runsvdir(void)
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{
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DIR *dir;
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direntry *d;
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int i;
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struct stat s;
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dir = opendir(".");
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if (!dir) {
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warn2_cannot("open directory ", svdir);
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return;
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}
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for (i = 0; i < svnum; i++)
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sv[i].isgone = 1;
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errno = 0;
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while ((d = readdir(dir))) {
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if (d->d_name[0] == '.') continue;
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if (stat(d->d_name, &s) == -1) {
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warn2_cannot("stat ", d->d_name);
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errno = 0;
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continue;
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}
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if (!S_ISDIR(s.st_mode)) continue;
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for (i = 0; i < svnum; i++) {
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if ((sv[i].ino == s.st_ino) && (sv[i].dev == s.st_dev)) {
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sv[i].isgone = 0;
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if (!sv[i].pid)
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runsv(i, d->d_name);
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break;
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}
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}
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if (i == svnum) {
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/* new service */
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struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
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if (!svnew) {
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warn3x("cannot start runsv ", d->d_name,
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" too many services");
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continue;
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}
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sv = svnew;
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svnum++;
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memset(&sv[i], 0, sizeof(sv[i]));
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sv[i].ino = s.st_ino;
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sv[i].dev = s.st_dev;
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//sv[i].pid = 0;
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//sv[i].isgone = 0;
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runsv(i, d->d_name);
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check = 1;
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}
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}
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if (errno) {
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warn2_cannot("read directory ", svdir);
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closedir(dir);
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check = 1;
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return;
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}
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closedir(dir);
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/* SIGTERM removed runsv's */
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for (i = 0; i < svnum; i++) {
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if (!sv[i].isgone)
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continue;
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if (sv[i].pid)
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kill(sv[i].pid, SIGTERM);
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sv[i] = sv[--svnum];
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check = 1;
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}
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}
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static int setup_log(void)
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{
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rploglen = strlen(rplog);
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if (rploglen < 7) {
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warnx("log must have at least seven characters");
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return 0;
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}
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if (pipe(logpipe) == -1) {
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warnx("cannot create pipe for log");
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return -1;
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}
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coe(logpipe[1]);
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coe(logpipe[0]);
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ndelay_on(logpipe[0]);
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ndelay_on(logpipe[1]);
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if (fd_copy(2, logpipe[1]) == -1) {
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warnx("cannot set filedescriptor for log");
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return -1;
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}
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io[0].fd = logpipe[0];
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io[0].events = IOPAUSE_READ;
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taia_now(&stamplog);
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return 1;
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}
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int runsvdir_main(int argc, char **argv)
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{
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struct stat s;
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time_t mtime = 0;
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int wstat;
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int curdir;
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int pid;
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struct taia deadline;
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struct taia now;
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struct taia stampcheck;
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char ch;
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int i;
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argv++;
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if (!argv || !*argv) usage();
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if (**argv == '-') {
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switch (*(*argv + 1)) {
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case 'P': pgrp = 1;
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case '-': ++argv;
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}
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if (!argv || !*argv) usage();
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}
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sig_catch(sig_term, s_term);
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sig_catch(sig_hangup, s_hangup);
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svdir = *argv++;
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if (argv && *argv) {
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rplog = *argv;
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if (setup_log() != 1) {
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rplog = 0;
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warnx("log service disabled");
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}
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}
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curdir = open_read(".");
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if (curdir == -1)
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fatal2_cannot("open current directory", "");
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coe(curdir);
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taia_now(&stampcheck);
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for (;;) {
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/* collect children */
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for (;;) {
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pid = wait_nohang(&wstat);
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if (pid <= 0) break;
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for (i = 0; i < svnum; i++) {
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if (pid == sv[i].pid) {
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/* runsv has gone */
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sv[i].pid = 0;
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check = 1;
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break;
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}
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}
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}
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taia_now(&now);
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if (now.sec.x < (stampcheck.sec.x - 3)) {
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/* time warp */
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warnx("time warp: resetting time stamp");
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taia_now(&stampcheck);
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taia_now(&now);
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if (rplog) taia_now(&stamplog);
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}
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if (taia_less(&now, &stampcheck) == 0) {
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/* wait at least a second */
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taia_uint(&deadline, 1);
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taia_add(&stampcheck, &now, &deadline);
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if (stat(svdir, &s) != -1) {
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if (check || s.st_mtime != mtime
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|| s.st_ino != ino || s.st_dev != dev
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) {
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/* svdir modified */
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if (chdir(svdir) != -1) {
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mtime = s.st_mtime;
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dev = s.st_dev;
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ino = s.st_ino;
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check = 0;
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if (now.sec.x <= (4611686018427387914ULL + (uint64_t)mtime))
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sleep(1);
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runsvdir();
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while (fchdir(curdir) == -1) {
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warn2_cannot("change directory, pausing", "");
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sleep(5);
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}
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} else
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warn2_cannot("change directory to ", svdir);
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}
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} else
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warn2_cannot("stat ", svdir);
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}
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if (rplog) {
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if (taia_less(&now, &stamplog) == 0) {
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write(logpipe[1], ".", 1);
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taia_uint(&deadline, 900);
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taia_add(&stamplog, &now, &deadline);
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}
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}
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taia_uint(&deadline, check ? 1 : 5);
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taia_add(&deadline, &now, &deadline);
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sig_block(sig_child);
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if (rplog)
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iopause(io, 1, &deadline, &now);
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else
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iopause(0, 0, &deadline, &now);
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sig_unblock(sig_child);
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if (rplog && (io[0].revents | IOPAUSE_READ))
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while (read(logpipe[0], &ch, 1) > 0)
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if (ch) {
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for (i = 6; i < rploglen; i++)
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rplog[i-1] = rplog[i];
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rplog[rploglen-1] = ch;
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}
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switch (exitsoon) {
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case 1:
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_exit(0);
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case 2:
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for (i = 0; i < svnum; i++)
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if (sv[i].pid)
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kill(sv[i].pid, SIGTERM);
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_exit(111);
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}
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}
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/* not reached */
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return 0;
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}
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