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#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>
#include "direntry.h"
#include "strerr.h"
#include "error.h"
#include "wait.h"
#include "env.h"
#include "pathexec.h"
#include "fd.h"
#include "str.h"
#include "coe.h"
#include "iopause.h"
#include "sig.h"
#include "ndelay.h"
#define USAGE " dir"
#define VERSION "$Id$"
#define MAXSERVICES 1000
char *progname;
char *svdir;
struct {
unsigned long dev;
unsigned long ino;
int pid;
int isgone;
} sv[MAXSERVICES];
int svnum =0;
int check =1;
char *log =0;
int loglen;
int logpipe[2];
iopause_fd io[1];
struct taia stamplog;
void usage () {
strerr_die4x(1, "usage: ", progname, USAGE, "\n");
}
void fatal(char *m1, char *m2) {
strerr_die6sys(100, "runsvdir ", svdir, ": fatal: ", m1, m2, ": ");
}
void warn(char *m1, char *m2) {
strerr_warn6("runsvdir ", svdir, ": warning: ", m1, m2, ": ", &strerr_sys);
}
void warn3x(char *m1, char *m2, char *m3) {
strerr_warn6("runsvdir ", svdir, ": warning: ", m1, m2, m3, 0);
}
void runsv(int no, char *name) {
int pid;
if ((pid =fork()) == -1) {
warn("unable to fork for ", name);
return;
}
if (pid == 0) {
/* child */
const char *prog[3];
prog[0] ="runsv";
prog[1] =name;
prog[2] =0;
if (log)
if (fd_move(2, logpipe[1]) == -1)
warn("unable to set filedescriptor for log service", 0);
pathexec_run(*prog, prog, (const char* const*)environ);
fatal("unable to start runsv ", name);
}
sv[no].pid =pid;
}
void runsvdir() {
DIR *dir;
direntry *d;
int i;
struct stat s;
if (! (dir =opendir("."))) {
warn("unable to open directory ", svdir);
return;
}
for (i =0; i < svnum; i++)
sv[i].isgone =1;
errno =0;
while ((d =readdir(dir))) {
if (d->d_name[0] == '.') continue;
if (stat(d->d_name, &s) == -1) {
warn("unable to stat ", d->d_name);
return;
}
if (! S_ISDIR(s.st_mode))
continue;
for (i =0; i < svnum; i++) {
if ((sv[i].ino == s.st_ino) && (sv[i].dev == s.st_dev)) {
sv[i].isgone =0;
if (! sv[i].pid)
runsv(i, d->d_name);
break;
}
}
if (i == svnum) {
/* new service */
if (svnum >= MAXSERVICES) {
warn3x("unable to start runsv ", d->d_name, ": too many services.");
continue;
}
sv[i].ino =s.st_ino;
sv[i].dev =s.st_dev;
sv[i].pid =0;
sv[i].isgone =0;
svnum++;
runsv(i, d->d_name);
}
}
if (errno) {
warn("unable to read directory ", svdir);
closedir(dir);
return;
}
closedir(dir);
/* SIGTERM removed runsv's */
for (i =0; i < svnum; i++) {
if (! sv[i].isgone)
continue;
if (sv[i].pid)
kill(sv[i].pid, SIGTERM);
sv[i] =sv[--svnum];
check =1;
}
}
int setup_log() {
if ((loglen =str_len(log)) < 7) {
warn3x("log must have at least seven characters.", 0, 0);
return(0);
}
if (pipe(logpipe) == -1) {
warn3x("unable to create pipe for log.", 0, 0);
return(-1);
}
coe(logpipe[1]);
coe(logpipe[0]);
ndelay_on(logpipe[0]);
ndelay_on(logpipe[1]);
if (fd_copy(2, logpipe[1]) == -1) {
warn3x("unable to set filedescriptor for log.", 0, 0);
return(-1);
}
io[0].fd =logpipe[0];
io[0].events =IOPAUSE_READ;
taia_now(&stamplog);
return(1);
}
int main(int argc, char **argv) {
struct stat s;
time_t mtime =0;
int wstat;
int pid;
struct taia deadline;
struct taia now;
char ch;
int i;
progname =*argv++;
if (! argv || ! *argv) usage();
svdir =*argv++;
if (argv && *argv) {
log =*argv;
if (setup_log() != 1) {
log =0;
warn3x("log service disabled.", 0, 0);
}
}
if (chdir(svdir) == -1)
fatal("unable to change directory to ", svdir);
for (;;) {
/* collect children */
for (;;) {
if ((pid =wait_nohang(&wstat)) <= 0) break;
for (i =0; i < svnum; i++) {
if (pid == sv[i].pid) {
/* runsv has gone */
sv[i].pid =0;
check =1;
break;
}
}
}
if (stat(".", &s) != -1) {
if (check || s.st_mtime > mtime) {
/* svdir modified */
mtime =s.st_mtime;
check =0;
runsvdir();
}
}
else
warn("unable to stat ", svdir);
taia_now(&now);
if (log)
if (taia_less(&now, &stamplog) == 0) {
write(logpipe[1], ".", 1);
taia_uint(&deadline, 900);
taia_add(&stamplog, &stamplog, &deadline);
}
taia_uint(&deadline, 5);
taia_add(&deadline, &now, &deadline);
sig_block(sig_child);
if (log)
iopause(io, 1, &deadline, &now);
else
iopause(0, 0, &deadline, &now);
sig_unblock(sig_child);
if (log)
if (io[0].revents | IOPAUSE_READ) {
while (read(logpipe[0], &ch, 1) > 0) {
if (ch) {
for (i =6; i < loglen; i++)
log[i -1] =log[i];
log[loglen -1] =ch;
}
}
}
}
/* not reached */
exit(0);
}
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