minix3/lib/libc/sys/ioctl.c

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2020-02-21 00:59:27 +05:30
#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <stdarg.h>
#include <sys/ioctl.h>
#include <minix/i2c.h>
#include <string.h>
#include <sys/ioccom.h>
#include <stdarg.h>
static void rewrite_i2c_netbsd_to_minix(minix_i2c_ioctl_exec_t *out,
i2c_ioctl_exec_t *in);
static void rewrite_i2c_minix_to_netbsd(i2c_ioctl_exec_t *out,
minix_i2c_ioctl_exec_t *in);
static void rewrite_i2c_netbsd_to_minix(minix_i2c_ioctl_exec_t *out,
i2c_ioctl_exec_t *in)
{
memset(out, '\0', sizeof(minix_i2c_ioctl_exec_t));
out->iie_op = in->iie_op;
out->iie_addr = in->iie_addr;
out->iie_cmdlen = I2C_EXEC_MAX_CMDLEN < in->iie_cmdlen ?
I2C_EXEC_MAX_CMDLEN : in->iie_cmdlen;
out->iie_buflen = I2C_EXEC_MAX_BUFLEN < in->iie_buflen ?
I2C_EXEC_MAX_BUFLEN : in->iie_buflen;
if (in->iie_cmdlen > 0 && in->iie_cmd != NULL) {
memcpy(out->iie_cmd, in->iie_cmd, in->iie_cmdlen);
}
if (in->iie_buflen > 0 && in->iie_buf != NULL) {
memcpy(out->iie_buf, in->iie_buf, in->iie_buflen);
}
}
static void rewrite_i2c_minix_to_netbsd(i2c_ioctl_exec_t *out,
minix_i2c_ioctl_exec_t *in)
{
/* the only field that changes is iie_buf, everything else is the same */
if (in->iie_buflen > 0 && in->iie_buf != NULL) {
memcpy(out->iie_buf, in->iie_buf, in->iie_buflen);
}
}
int ioctl(int fd, unsigned long request, ...)
{
int r, request_save;
message m;
vir_bytes addr;
void *data;
va_list ap;
va_start(ap, request);
data = va_arg(ap, void *);
/*
* To support compatibility with interfaces on other systems, certain
* requests are re-written to flat structures (i.e. without pointers).
*/
minix_i2c_ioctl_exec_t i2c;
request_save = request;
switch (request) {
case I2C_IOCTL_EXEC:
rewrite_i2c_netbsd_to_minix(&i2c, data);
addr = (vir_bytes) &i2c;
request = MINIX_I2C_IOCTL_EXEC;
break;
default:
/* Keep original as-is */
addr = data;
break;
}
memset(&m, 0, sizeof(m));
m.m_lc_vfs_ioctl.fd = fd;
m.m_lc_vfs_ioctl.req = request;
m.m_lc_vfs_ioctl.arg = addr;
r = _syscall(VFS_PROC_NR, VFS_IOCTL, &m);
/* Translate back to original form */
switch (request_save) {
case I2C_IOCTL_EXEC:
rewrite_i2c_minix_to_netbsd(data, &i2c);
break;
default:
/* Nothing to do */
break;
}
va_end(ap);
return r;
}