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/*
* AVR emulator
* Emulator subprocess management
*
* Copyright (C) 2007 Michael Buesch <mb@bu3sch.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "subprocess.h"
#include "devprocess.h"
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
static int fork_device_instance(struct avremu_host_instance *host)
{
struct avremu_device_instance *dev;
int err;
pid_t pid;
struct avrmsg_to_host hostmsg;
dev = avr_malloc(sizeof(*dev));
if (!dev)
return -ENOMEM;
dev->type = host->type;
err = ipc_pipe_create(&host->msg_to_device, &dev->msg_from_host);
if (err) {
err = -ENOMEM;
goto err_free_dev;
}
err = ipc_pipe_create(&dev->msg_to_host, &host->msg_from_device);
if (err) {
err = -ENOMEM;
goto err_destroy1;
}
err = ipc_pipe_create(&dev->status_to_host, &host->status_from_device);
if (err) {
err = -ENOMEM;
goto err_destroy2;
}
pid = fork();
if (pid == (pid_t)0) {
/* DEVICE process */
ipc_pipe_destroy_tx(&host->msg_to_device);
ipc_pipe_destroy_rx(&host->msg_from_device);
ipc_pipe_destroy_rx(&host->status_from_device);
host = NULL;
/* Map stderr and stdout to the status pipe.
* Also enable line buffering. */
ipc_dup2(&dev->status_to_host, STDERR_FILENO);
ipc_dup2(&dev->status_to_host, STDOUT_FILENO);
setvbuf(stdout, NULL, _IOLBF, 0);
setvbuf(stderr, NULL, _IOLBF, 0);
/* Run the device process. */
err = avr_device_process_run(dev);
sendnotify_to_host(dev, HOSTMSG_EXIT);
exit(err >= 0 ? err : -err);
} else if (pid < (pid_t)0) {
/* Failure */
err = -ENOMEM;
goto err_destroy3;
} else {
/* HOST process */
ipc_pipe_destroy_tx(&dev->msg_to_host);
ipc_pipe_destroy_rx(&dev->msg_from_host);
ipc_pipe_destroy_tx(&dev->status_to_host);
free(dev);
dev = NULL;
host->device_pid = pid;
/* Wait for the device to initialize itself. */
while (1) {
err = pollmsg_from_device(host, &hostmsg);
if (err < 0) {
err = -EIO;
goto host_error;
}
if (err > 0) {
if (hostmsg.msg == HOSTMSG_READY)
break;
if (hostmsg.msg == HOSTMSG_EXIT) {
if (waitpid(pid, &err, 0) != pid)
err = -ESRCH;
else
err = WEXITSTATUS(err);
goto host_error;
}
}
}
host->device_running = 1;
return 0;
host_error:
ipc_pipe_destroy_tx(&host->msg_to_device);
ipc_pipe_destroy_rx(&host->msg_from_device);
ipc_pipe_destroy_rx(&host->status_from_device);
return err;
}
return 0;
err_destroy3:
ipc_pipe_destroy(&dev->status_to_host, &host->status_from_device);
err_destroy2:
ipc_pipe_destroy(&dev->msg_to_host, &host->msg_from_device);
err_destroy1:
ipc_pipe_destroy(&host->msg_to_device, &dev->msg_from_host);
err_free_dev:
free(dev);
return err;
}
static void kill_device_instance(struct avremu_host_instance *host)
{
int err;
printf("KILLING INSTANCE\n");
if (!host->device_running)
return;
printf("SEND TERM\n");
err = kill(host->device_pid, SIGTERM);
if (err) {
perror("Kill device process");
return;
}
printf("WAITING\n");
waitpid(host->device_pid, NULL, 0);
host->device_running = 0;
printf("WAITING DONE.\n");
}
int avremu_instance_create(struct avremu_host_instance *host,
enum avr_setup_type type)
{
int err;
host->type = type;
err = fork_device_instance(host);
return err;
}
void avremu_instance_destroy(struct avremu_host_instance *host)
{
kill_device_instance(host);
}
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