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Under Linux it's possible to return values through the ioctl system 

call directly (i.e. not a reference argument, but a direct return
value). So far I have only seen this with binaries that talk
to their own device modules, using non-standard ioctl calls.
Hence, allow for a pass-through ioctl call using PTIOCLINUX to
return EJUSTRETURN, signalling that the return value is in
the 'data' field of the structure, which can then be put in 'retval'.
This commit is contained in:
fvdl 2000-12-29 20:07:25 +00:00
parent f693a6019a
commit b930296d07
1 changed files with 7 additions and 1 deletions
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8
sys/compat/linux/arch/i386/linux_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: linux_machdep.c,v 1.56 2000/12/22 22:58:57 jdolecek Exp $ */
/* $NetBSD: linux_machdep.c,v 1.57 2000/12/29 20:07:25 fvdl Exp $ */
/*-
* Copyright (c) 1995, 2000 The NetBSD Foundation, Inc.
@ -775,6 +775,8 @@ linux_machdepioctl(p, v, retval)
* Unknown to us. If it's on a device, just pass it through
* using PTIOCLINUX, the device itself might be able to
* make some sense of it.
* XXX hack: if the function returns EJUSTRETURN,
* it has stuffed a sysctl return value in pt.data.
*/
FILE_USE(fp);
ioctlf = fp->f_ops->fo_ioctl;
@ -782,6 +784,10 @@ linux_machdepioctl(p, v, retval)
pt.data = SCARG(uap, data);
error = ioctlf(fp, PTIOCLINUX, (caddr_t)&pt, p);
FILE_UNUSE(fp, p);
if (error == EJUSTRETURN) {
retval[0] = (register_t)pt.data;
error = 0;
}
if (error == EINVAL)
printf("linux_machdepioctl: invalid ioctl %08lx\n",