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#include <bus.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <sys/wait.h>
#define t(stmt) if (stmt) goto fail
static char arg[4098];
static int argc;
static char **argv;
static int remaining = 0;
static char *started = NULL;
static char msg[BUS_MEMORY_SIZE];
static void announce_wait(pid_t pid)
{
bus_t bus;
int i;
t(bus_open(&bus, getenv("BUS_INIT"), BUS_WRONLY));
for (i = 1; i < argc; i++) {
if (!started[i]) {
sprintf(arg, "%ji awaiting-ready %s", (intmax_t)pid, argv[i]);
t(bus_write(&bus, arg));
}
}
t(bus_close(&bus));
return;
fail:
perror("await-ready");
}
static int callback(const char *message, void *user_data)
{
int i;
char *arg2;
char *arg3;
pid_t pid;
pid_t ppid;
if (!message) {
ppid = getppid();
pid = fork();
if (pid == 0) {
if (fork() == 0)
announce_wait(ppid);
exit(0);
} else {
(void) waitpid(pid, NULL, 0); /* Let's pretend everything will go swimmingly. */
}
return 1;
}
strncpy(msg, message, BUS_MEMORY_SIZE - 1);
msg[BUS_MEMORY_SIZE - 1] = 0;
arg2 = strchr(msg, ' ');
if (!arg2)
return 1;
arg3 = strchr(++arg2, ' ');
if (!arg3)
return 1;
*arg3++ = 0;
if (strcmp(arg2, "ready"))
return 1;
for (i = 1; i < argc; i++)
if (!started[i] && !strcmp(argv[i], arg3))
started[i] = 1, remaining--;
return !!remaining;
(void) user_data;
}
int main(int argc_, char *argv_[])
{
bus_t bus;
int i;
argc = argc_;
argv = argv_;
if (argc < 2)
return fprintf(stderr, "USAGE: %s daemon...", *argv), 2;
t(bus_open(&bus, getenv("BUS_INIT"), BUS_RDONLY));
started = calloc(argc, sizeof(char));
t(started == NULL);
started[0] = 1;
for (i = 1; i < argc; i++) {
sprintf(arg, "grep '^%s$' < \"${XDG_RUNTIME_DIR}/ready-daemons\" >/dev/null", argv[i]);
if (!WEXITSTATUS(system(arg)))
started[i] = 1;
else
remaining++;
}
if (remaining)
bus_read(&bus, callback, NULL);
bus_close(&bus);
free(started);
return 0;
fail:
perror("await-ready");
bus_close(&bus);
free(started);
return 1;
}
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