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[PATCH] uml: Fix SIGWINCH relaying

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This makes SIGWINCH work again, and fixes a couple of SIGWINCH-associated
crashes.  First, the sigio thread disables SIGWINCH because all hell breaks
loose if it ever gets one and tries to call the signal handling code.  Second,
there was a problem with deferencing tty structs after they were freed.  The
SIGWINCH support for a tty wasn't being turned off or freed after the tty went
away.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike
2005-05-05 16:15:32 -07:00
committed by Linus Torvalds
parent c578455a3e
commit cd2ee4a30c
8 changed files with 55 additions and 7 deletions
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1
arch/um/kernel/irq.c
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@@ -163,7 +163,6 @@ void __init init_IRQ(void)
irq_desc[i].handler = &SIGIO_irq_type;
enable_irq(i);
}
init_irq_signals(0);
}
/*

2
arch/um/kernel/process.c
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@@ -65,8 +65,6 @@ void init_new_thread_signals(int altstack)
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
set_handler(SIGBUS, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
set_handler(SIGWINCH, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
set_handler(SIGUSR2, (__sighandler_t) sig_handler,
flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
signal(SIGHUP, SIG_IGN);

1
arch/um/kernel/sigio_user.c
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@@ -182,6 +182,7 @@ static int write_sigio_thread(void *unused)
int i, n, respond_fd;
char c;
signal(SIGWINCH, SIG_IGN);
fds = &current_poll;
while(1){
n = poll(fds->poll, fds->used, -1);

7
arch/um/kernel/skas/process.c
View File

@@ -28,10 +28,11 @@
#include "chan_user.h"
#include "signal_user.h"
#include "registers.h"
#include "process.h"
int is_skas_winch(int pid, int fd, void *data)
{
if(pid != os_getpid())
if(pid != os_getpgrp())
return(0);
register_winch_irq(-1, fd, -1, data);
@@ -259,6 +260,10 @@ int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
sigjmp_buf **switch_buf = switch_buf_ptr;
int n;
set_handler(SIGWINCH, (__sighandler_t) sig_handler,
SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM,
SIGVTALRM, -1);
*fork_buf_ptr = &initial_jmpbuf;
n = sigsetjmp(initial_jmpbuf, 1);
if(n == 0)

4
arch/um/kernel/tt/tracer.c
View File

@@ -26,6 +26,7 @@
#include "kern_util.h"
#include "chan_user.h"
#include "ptrace_user.h"
#include "irq_user.h"
#include "mode.h"
#include "tt.h"
@@ -33,7 +34,7 @@ static int tracer_winch[2];
int is_tracer_winch(int pid, int fd, void *data)
{
if(pid != tracing_pid)
if(pid != os_getpgrp())
return(0);
register_winch_irq(tracer_winch[0], fd, -1, data);
@@ -119,6 +120,7 @@ static int signal_tramp(void *arg)
signal(SIGSEGV, (__sighandler_t) sig_handler);
set_cmdline("(idle thread)");
set_init_pid(os_getpid());
init_irq_signals(0);
proc = arg;
return((*proc)(NULL));
}