uml: move SIGIO testing to sigio.c
This patch narrows the sigio interface. The boot-time SIGIO testing used to be in start_up.c, which meant that pty_output_sigio and pty_close_sigio needed to be global. By moving that code here, those can become static and the declarations moved from user_util.h. os_check_bugs is also here because it only does the SIGIO checking. If it does more, it'll probably move back to start_up.c. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>wifi-calibration
Jeff Dike
Linus Torvalds
parent
c5e631cf65
commit
c65badbdf5
|
|
@ -51,9 +51,6 @@ extern unsigned long _stext, _etext, _sdata, _edata, __bss_start, _end;
|
|||
extern unsigned long _unprotected_end;
|
||||
extern unsigned long brk_start;
|
||||
|
||||
extern int pty_output_sigio;
|
||||
extern int pty_close_sigio;
|
||||
|
||||
extern void *add_signal_handler(int sig, void (*handler)(int));
|
||||
extern int linux_main(int argc, char **argv);
|
||||
extern void set_cmdline(char *cmd);
|
||||
|
|
|
|||
|
|
@ -8,6 +8,7 @@
|
|||
#include <termios.h>
|
||||
#include <pty.h>
|
||||
#include <signal.h>
|
||||
#include <fcntl.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
#include <sched.h>
|
||||
|
|
@ -20,6 +21,7 @@
|
|||
#include "sigio.h"
|
||||
#include "os.h"
|
||||
#include "um_malloc.h"
|
||||
#include "init.h"
|
||||
|
||||
/* Protected by sigio_lock(), also used by sigio_cleanup, which is an
|
||||
* exitcall.
|
||||
|
|
@ -320,6 +322,10 @@ out_close1:
|
|||
close(l_write_sigio_fds[1]);
|
||||
}
|
||||
|
||||
/* Changed during early boot */
|
||||
static int pty_output_sigio = 0;
|
||||
static int pty_close_sigio = 0;
|
||||
|
||||
void maybe_sigio_broken(int fd, int read)
|
||||
{
|
||||
int err;
|
||||
|
|
@ -357,3 +363,142 @@ static void sigio_cleanup(void)
|
|||
}
|
||||
|
||||
__uml_exitcall(sigio_cleanup);
|
||||
|
||||
/* Used as a flag during SIGIO testing early in boot */
|
||||
static volatile int got_sigio = 0;
|
||||
|
||||
static void __init handler(int sig)
|
||||
{
|
||||
got_sigio = 1;
|
||||
}
|
||||
|
||||
struct openpty_arg {
|
||||
int master;
|
||||
int slave;
|
||||
int err;
|
||||
};
|
||||
|
||||
static void openpty_cb(void *arg)
|
||||
{
|
||||
struct openpty_arg *info = arg;
|
||||
|
||||
info->err = 0;
|
||||
if(openpty(&info->master, &info->slave, NULL, NULL, NULL))
|
||||
info->err = -errno;
|
||||
}
|
||||
|
||||
static int async_pty(int master, int slave)
|
||||
{
|
||||
int flags;
|
||||
|
||||
flags = fcntl(master, F_GETFL);
|
||||
if(flags < 0)
|
||||
return -errno;
|
||||
|
||||
if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) ||
|
||||
(fcntl(master, F_SETOWN, os_getpid()) < 0))
|
||||
return -errno;
|
||||
|
||||
if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0))
|
||||
return -errno;
|
||||
|
||||
return(0);
|
||||
}
|
||||
|
||||
static void __init check_one_sigio(void (*proc)(int, int))
|
||||
{
|
||||
struct sigaction old, new;
|
||||
struct openpty_arg pty = { .master = -1, .slave = -1 };
|
||||
int master, slave, err;
|
||||
|
||||
initial_thread_cb(openpty_cb, &pty);
|
||||
if(pty.err){
|
||||
printk("openpty failed, errno = %d\n", -pty.err);
|
||||
return;
|
||||
}
|
||||
|
||||
master = pty.master;
|
||||
slave = pty.slave;
|
||||
|
||||
if((master == -1) || (slave == -1)){
|
||||
printk("openpty failed to allocate a pty\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/* Not now, but complain so we now where we failed. */
|
||||
err = raw(master);
|
||||
if (err < 0)
|
||||
panic("check_sigio : __raw failed, errno = %d\n", -err);
|
||||
|
||||
err = async_pty(master, slave);
|
||||
if(err < 0)
|
||||
panic("tty_fds : sigio_async failed, err = %d\n", -err);
|
||||
|
||||
if(sigaction(SIGIO, NULL, &old) < 0)
|
||||
panic("check_sigio : sigaction 1 failed, errno = %d\n", errno);
|
||||
new = old;
|
||||
new.sa_handler = handler;
|
||||
if(sigaction(SIGIO, &new, NULL) < 0)
|
||||
panic("check_sigio : sigaction 2 failed, errno = %d\n", errno);
|
||||
|
||||
got_sigio = 0;
|
||||
(*proc)(master, slave);
|
||||
|
||||
close(master);
|
||||
close(slave);
|
||||
|
||||
if(sigaction(SIGIO, &old, NULL) < 0)
|
||||
panic("check_sigio : sigaction 3 failed, errno = %d\n", errno);
|
||||
}
|
||||
|
||||
static void tty_output(int master, int slave)
|
||||
{
|
||||
int n;
|
||||
char buf[512];
|
||||
|
||||
printk("Checking that host ptys support output SIGIO...");
|
||||
|
||||
memset(buf, 0, sizeof(buf));
|
||||
|
||||
while(os_write_file(master, buf, sizeof(buf)) > 0) ;
|
||||
if(errno != EAGAIN)
|
||||
panic("check_sigio : write failed, errno = %d\n", errno);
|
||||
while(((n = os_read_file(slave, buf, sizeof(buf))) > 0) && !got_sigio) ;
|
||||
|
||||
if(got_sigio){
|
||||
printk("Yes\n");
|
||||
pty_output_sigio = 1;
|
||||
}
|
||||
else if(n == -EAGAIN) printk("No, enabling workaround\n");
|
||||
else panic("check_sigio : read failed, err = %d\n", n);
|
||||
}
|
||||
|
||||
static void tty_close(int master, int slave)
|
||||
{
|
||||
printk("Checking that host ptys support SIGIO on close...");
|
||||
|
||||
close(slave);
|
||||
if(got_sigio){
|
||||
printk("Yes\n");
|
||||
pty_close_sigio = 1;
|
||||
}
|
||||
else printk("No, enabling workaround\n");
|
||||
}
|
||||
|
||||
void __init check_sigio(void)
|
||||
{
|
||||
if((os_access("/dev/ptmx", OS_ACC_R_OK) < 0) &&
|
||||
(os_access("/dev/ptyp0", OS_ACC_R_OK) < 0)){
|
||||
printk("No pseudo-terminals available - skipping pty SIGIO "
|
||||
"check\n");
|
||||
return;
|
||||
}
|
||||
check_one_sigio(tty_output);
|
||||
check_one_sigio(tty_close);
|
||||
}
|
||||
|
||||
/* Here because it only does the SIGIO testing for now */
|
||||
void __init os_check_bugs(void)
|
||||
{
|
||||
check_sigio();
|
||||
}
|
||||
|
|
|
|||
|
|
@ -553,148 +553,3 @@ int __init parse_iomem(char *str, int *add)
|
|||
out:
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
/* Changed during early boot */
|
||||
int pty_output_sigio = 0;
|
||||
int pty_close_sigio = 0;
|
||||
|
||||
/* Used as a flag during SIGIO testing early in boot */
|
||||
static volatile int got_sigio = 0;
|
||||
|
||||
static void __init handler(int sig)
|
||||
{
|
||||
got_sigio = 1;
|
||||
}
|
||||
|
||||
struct openpty_arg {
|
||||
int master;
|
||||
int slave;
|
||||
int err;
|
||||
};
|
||||
|
||||
static void openpty_cb(void *arg)
|
||||
{
|
||||
struct openpty_arg *info = arg;
|
||||
|
||||
info->err = 0;
|
||||
if(openpty(&info->master, &info->slave, NULL, NULL, NULL))
|
||||
info->err = -errno;
|
||||
}
|
||||
|
||||
static int async_pty(int master, int slave)
|
||||
{
|
||||
int flags;
|
||||
|
||||
flags = fcntl(master, F_GETFL);
|
||||
if(flags < 0)
|
||||
return -errno;
|
||||
|
||||
if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) ||
|
||||
(fcntl(master, F_SETOWN, os_getpid()) < 0))
|
||||
return -errno;
|
||||
|
||||
if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0))
|
||||
return -errno;
|
||||
|
||||
return(0);
|
||||
}
|
||||
|
||||
static void __init check_one_sigio(void (*proc)(int, int))
|
||||
{
|
||||
struct sigaction old, new;
|
||||
struct openpty_arg pty = { .master = -1, .slave = -1 };
|
||||
int master, slave, err;
|
||||
|
||||
initial_thread_cb(openpty_cb, &pty);
|
||||
if(pty.err){
|
||||
printk("openpty failed, errno = %d\n", -pty.err);
|
||||
return;
|
||||
}
|
||||
|
||||
master = pty.master;
|
||||
slave = pty.slave;
|
||||
|
||||
if((master == -1) || (slave == -1)){
|
||||
printk("openpty failed to allocate a pty\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/* Not now, but complain so we now where we failed. */
|
||||
err = raw(master);
|
||||
if (err < 0)
|
||||
panic("check_sigio : __raw failed, errno = %d\n", -err);
|
||||
|
||||
err = async_pty(master, slave);
|
||||
if(err < 0)
|
||||
panic("tty_fds : sigio_async failed, err = %d\n", -err);
|
||||
|
||||
if(sigaction(SIGIO, NULL, &old) < 0)
|
||||
panic("check_sigio : sigaction 1 failed, errno = %d\n", errno);
|
||||
new = old;
|
||||
new.sa_handler = handler;
|
||||
if(sigaction(SIGIO, &new, NULL) < 0)
|
||||
panic("check_sigio : sigaction 2 failed, errno = %d\n", errno);
|
||||
|
||||
got_sigio = 0;
|
||||
(*proc)(master, slave);
|
||||
|
||||
close(master);
|
||||
close(slave);
|
||||
|
||||
if(sigaction(SIGIO, &old, NULL) < 0)
|
||||
panic("check_sigio : sigaction 3 failed, errno = %d\n", errno);
|
||||
}
|
||||
|
||||
static void tty_output(int master, int slave)
|
||||
{
|
||||
int n;
|
||||
char buf[512];
|
||||
|
||||
printk("Checking that host ptys support output SIGIO...");
|
||||
|
||||
memset(buf, 0, sizeof(buf));
|
||||
|
||||
while(os_write_file(master, buf, sizeof(buf)) > 0) ;
|
||||
if(errno != EAGAIN)
|
||||
panic("check_sigio : write failed, errno = %d\n", errno);
|
||||
while(((n = os_read_file(slave, buf, sizeof(buf))) > 0) && !got_sigio) ;
|
||||
|
||||
if(got_sigio){
|
||||
printk("Yes\n");
|
||||
pty_output_sigio = 1;
|
||||
}
|
||||
else if(n == -EAGAIN) printk("No, enabling workaround\n");
|
||||
else panic("check_sigio : read failed, err = %d\n", n);
|
||||
}
|
||||
|
||||
static void tty_close(int master, int slave)
|
||||
{
|
||||
printk("Checking that host ptys support SIGIO on close...");
|
||||
|
||||
close(slave);
|
||||
if(got_sigio){
|
||||
printk("Yes\n");
|
||||
pty_close_sigio = 1;
|
||||
}
|
||||
else printk("No, enabling workaround\n");
|
||||
}
|
||||
|
||||
void __init check_sigio(void)
|
||||
{
|
||||
if((os_access("/dev/ptmx", OS_ACC_R_OK) < 0) &&
|
||||
(os_access("/dev/ptyp0", OS_ACC_R_OK) < 0)){
|
||||
printk("No pseudo-terminals available - skipping pty SIGIO "
|
||||
"check\n");
|
||||
return;
|
||||
}
|
||||
check_one_sigio(tty_output);
|
||||
check_one_sigio(tty_close);
|
||||
}
|
||||
|
||||
void os_check_bugs(void)
|
||||
{
|
||||
check_ptrace();
|
||||
check_sigio();
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue