[net-next-2.6.git] / arch / um / drivers / slirp_user.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <sched.h>
#include <string.h>
#include <errno.h>
#include <sys/wait.h>
#include <sys/signal.h>
#include "kern_util.h"
#include "user.h"
#include "net_user.h"
#include "slirp.h"
#include "slip_common.h"
#include "os.h"

static int slirp_user_init(void *data, void *dev)
{
	struct slirp_data *pri = data;

	pri->dev = dev;
	return 0;
}

struct slirp_pre_exec_data {
	int stdin;
	int stdout;
};

static void slirp_pre_exec(void *arg)
{
	struct slirp_pre_exec_data *data = arg;

	if(data->stdin != -1) dup2(data->stdin, 0);
	if(data->stdout != -1) dup2(data->stdout, 1);
}

static int slirp_tramp(char **argv, int fd)
{
	struct slirp_pre_exec_data pe_data;
	int pid;

	pe_data.stdin = fd;
	pe_data.stdout = fd;
	pid = run_helper(slirp_pre_exec, &pe_data, argv);

	return(pid);
}

static int slirp_open(void *data)
{
	struct slirp_data *pri = data;
	int fds[2], pid, err;

	err = os_pipe(fds, 1, 1);
	if(err)
		return(err);

	err = slirp_tramp(pri->argw.argv, fds[1]);
	if(err < 0){
		printk("slirp_tramp failed - errno = %d\n", -err);
		goto out;
	}
	pid = err;

	pri->slave = fds[1];
	pri->slip.pos = 0;
	pri->slip.esc = 0;
	pri->pid = err;

	return(fds[0]);
out:
	os_close_file(fds[0]);
	os_close_file(fds[1]);
	return err;
}

static void slirp_close(int fd, void *data)
{
	struct slirp_data *pri = data;
	int status,err;

	os_close_file(fd);
	os_close_file(pri->slave);

	pri->slave = -1;

	if(pri->pid<1) {
		printk("slirp_close: no child process to shut down\n");
		return;
	}

#if 0
	if(kill(pri->pid, SIGHUP)<0) {
		printk("slirp_close: sending hangup to %d failed (%d)\n",
			pri->pid, errno);
	}
#endif

	CATCH_EINTR(err = waitpid(pri->pid, &status, WNOHANG));
	if(err < 0) {
		printk("slirp_close: waitpid returned %d\n", errno);
		return;
	}

	if(err == 0) {
		printk("slirp_close: process %d has not exited\n", pri->pid);
		return;
	}

	pri->pid = -1;
}

int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
{
	return slip_proto_read(fd, buf, len, &pri->slip);
}

int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
{
	return slip_proto_write(fd, buf, len, &pri->slip);
}

static int slirp_set_mtu(int mtu, void *data)
{
	return(mtu);
}

const struct net_user_info slirp_user_info = {
	.init		= slirp_user_init,
	.open		= slirp_open,
	.close	 	= slirp_close,
	.remove	 	= NULL,
	.set_mtu	= slirp_set_mtu,
	.add_address	= NULL,
	.delete_address = NULL,
	.max_packet	= BUF_SIZE
};
Commit	Line	Data
1da177e4 LT	1	#include <stdio.h>
	2	#include <stdlib.h>
	3	#include <unistd.h>
	4	#include <stddef.h>
	5	#include <sched.h>
	6	#include <string.h>
	7	#include <errno.h>
	8	#include <sys/wait.h>
	9	#include <sys/signal.h>
1da177e4 LT	10	#include "kern_util.h"
	11	#include "user.h"
	12	#include "net_user.h"
	13	#include "slirp.h"
a3c77c67	14	#include "slip_common.h"
1da177e4 LT	15	#include "os.h"
1da177e4 LT	16
f34d9d2d	17	static int slirp_user_init(void data, void dev)
1da177e4 LT	18	{
	19	struct slirp_data *pri = data;
	20
	21	pri->dev = dev;
f34d9d2d	22	return 0;
1da177e4 LT	23	}
	24
	25	struct slirp_pre_exec_data {
	26	int stdin;
	27	int stdout;
	28	};
	29
	30	static void slirp_pre_exec(void *arg)
	31	{
	32	struct slirp_pre_exec_data *data = arg;
	33
	34	if(data->stdin != -1) dup2(data->stdin, 0);
	35	if(data->stdout != -1) dup2(data->stdout, 1);
	36	}
	37
	38	static int slirp_tramp(char **argv, int fd)
	39	{
	40	struct slirp_pre_exec_data pe_data;
	41	int pid;
	42
	43	pe_data.stdin = fd;
	44	pe_data.stdout = fd;
c4399016	45	pid = run_helper(slirp_pre_exec, &pe_data, argv);
1da177e4 LT	46
	47	return(pid);
	48	}
	49
1da177e4 LT	50	static int slirp_open(void *data)
	51	{
	52	struct slirp_data *pri = data;
a3c77c67	53	int fds[2], pid, err;
1da177e4	54
a3c77c67	55	err = os_pipe(fds, 1, 1);
1da177e4 LT	56	if(err)
	57	return(err);
	58
a3c77c67 JD	59	err = slirp_tramp(pri->argw.argv, fds[1]);
	60	if(err < 0){
	61	printk("slirp_tramp failed - errno = %d\n", -err);
	62	goto out;
1da177e4	63	}
a3c77c67 JD	64	pid = err;
	65
	66	pri->slave = fds[1];
	67	pri->slip.pos = 0;
	68	pri->slip.esc = 0;
	69	pri->pid = err;
	70
	71	return(fds[0]);
	72	out:
	73	os_close_file(fds[0]);
	74	os_close_file(fds[1]);
	75	return err;
1da177e4 LT	76	}
	77
	78	static void slirp_close(int fd, void *data)
	79	{
	80	struct slirp_data *pri = data;
	81	int status,err;
	82
	83	os_close_file(fd);
	84	os_close_file(pri->slave);
	85
	86	pri->slave = -1;
	87
	88	if(pri->pid<1) {
	89	printk("slirp_close: no child process to shut down\n");
	90	return;
	91	}
	92
	93	#if 0
	94	if(kill(pri->pid, SIGHUP)<0) {
	95	printk("slirp_close: sending hangup to %d failed (%d)\n",
	96	pri->pid, errno);
	97	}
	98	#endif
	99
	100	CATCH_EINTR(err = waitpid(pri->pid, &status, WNOHANG));
	101	if(err < 0) {
	102	printk("slirp_close: waitpid returned %d\n", errno);
	103	return;
	104	}
	105
	106	if(err == 0) {
802e3077	107	printk("slirp_close: process %d has not exited\n", pri->pid);
1da177e4 LT	108	return;
	109	}
	110
	111	pri->pid = -1;
	112	}
	113
	114	int slirp_user_read(int fd, void buf, int len, struct slirp_data pri)
	115	{
a3c77c67	116	return slip_proto_read(fd, buf, len, &pri->slip);
1da177e4 LT	117	}
	118
	119	int slirp_user_write(int fd, void buf, int len, struct slirp_data pri)
	120	{
a3c77c67	121	return slip_proto_write(fd, buf, len, &pri->slip);
1da177e4 LT	122	}
	123
	124	static int slirp_set_mtu(int mtu, void *data)
	125	{
	126	return(mtu);
	127	}
	128
5e7672ec	129	const struct net_user_info slirp_user_info = {
1da177e4 LT	130	.init = slirp_user_init,
	131	.open = slirp_open,
	132	.close = slirp_close,
	133	.remove = NULL,
	134	.set_mtu = slirp_set_mtu,
	135	.add_address = NULL,
	136	.delete_address = NULL,
	137	.max_packet = BUF_SIZE
	138	};