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libc: support for deprecated FIO* ioctl(2) calls

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Various generic file IOCTL calls should be processed by VFS rather
than individual drivers.  For this reason, we rewrite them to use
fcntl(2) instead.

Change-Id: I38a5f3c7b21943a897114a51678a800f7e7f0a77
This commit is contained in:
David van Moolenbroek 2015-09-19 21:59:19 +00:00
parent 20054ae93f
commit ed223591a8
1 changed files with 73 additions and 2 deletions
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75
minix/lib/libc/sys/ioctl.c
View file

@ -8,6 +8,7 @@
#include <string.h>
#include <sys/ioccom.h>
#include <stdarg.h>
#include <fcntl.h>
static void rewrite_i2c_netbsd_to_minix(minix_i2c_ioctl_exec_t *out,
i2c_ioctl_exec_t *in);
@ -44,6 +45,69 @@ static void rewrite_i2c_minix_to_netbsd(i2c_ioctl_exec_t *out,
}
}
/*
* Library implementation of FIOCLEX and FIONCLEX.
*/
static int
ioctl_to_setfd(int fd, int mask, int val)
{
int fl;
if ((fl = fcntl(fd, F_GETFD)) == -1)
return -1;
fl = (fl & ~mask) | val;
return fcntl(fd, F_SETFD, fl);
}
/*
* Library implementation of FIONBIO and FIOASYNC.
*/
static int
ioctl_to_setfl(int fd, void * data, int sfl)
{
int arg, fl;
arg = *(int *)data;
if ((fl = fcntl(fd, F_GETFL)) == -1)
return -1;
if (arg)
fl |= sfl;
else
fl &= ~sfl;
return fcntl(fd, F_SETFL, fl & ~O_ACCMODE);
}
/*
* Library implementation of various deprecated IOCTLs. These particular IOCTL
* calls change how the file descriptors behave, and have nothing to do with
* the actual open file. They should therefore be handled by VFS rather than
* individual device drivers. We rewrite them to use fcntl(2) instead here.
*/
static int
ioctl_to_fcntl(int fd, unsigned long request, void * data)
{
switch (request) {
case FIOCLEX:
return ioctl_to_setfd(fd, FD_CLOEXEC, FD_CLOEXEC);
case FIONCLEX:
return ioctl_to_setfd(fd, FD_CLOEXEC, 0);
case FIONBIO:
return ioctl_to_setfl(fd, data, O_NONBLOCK);
case FIOASYNC:
return ioctl_to_setfl(fd, data, O_ASYNC);
case FIOSETOWN: /* XXX TODO */
case FIOGETOWN: /* XXX TODO */
default:
errno = ENOTTY;
return -1;
}
}
int ioctl(int fd, unsigned long request, ...)
{
int r, request_save;
@ -54,6 +118,7 @@ int ioctl(int fd, unsigned long request, ...)
va_start(ap, request);
data = va_arg(ap, void *);
va_end(ap);
/*
* To support compatibility with interfaces on other systems, certain
@ -64,6 +129,14 @@ int ioctl(int fd, unsigned long request, ...)
request_save = request;
switch (request) {
case FIOCLEX:
case FIONCLEX:
case FIONBIO:
case FIOASYNC:
case FIOSETOWN:
case FIOGETOWN:
return ioctl_to_fcntl(fd, request, data);
case I2C_IOCTL_EXEC:
rewrite_i2c_netbsd_to_minix(&i2c, data);
addr = (vir_bytes) &i2c;
@ -92,7 +165,5 @@ int ioctl(int fd, unsigned long request, ...)
break;
}
va_end(ap);
return r;
}