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/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <sched.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <setjmp.h>
#include <sys/time.h>
#include <sys/ptrace.h>
#include <linux/ptrace.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>
#include <asm/page.h>
#include "user_util.h"
#include "kern_util.h"
#include "user.h"
#include "signal_kern.h"
#include "signal_user.h"
#include "sysdep/ptrace.h"
#include "sysdep/sigcontext.h"
#include "irq_user.h"
#include "ptrace_user.h"
#include "time_user.h"
#include "init.h"
#include "os.h"
#include "uml-config.h"
#include "choose-mode.h"
#include "mode.h"
#include "tempfile.h"
/*
*-------------------------
* only for tt mode (will be deleted in future...)
*-------------------------
*/
struct tramp {
int (*tramp)(void *);
void *tramp_data;
unsigned long temp_stack;
int flags;
int pid;
};
/* See above for why sigkill is here */
int sigkill = SIGKILL;
int outer_tramp(void *arg)
{
struct tramp *t;
int sig = sigkill;
t = arg;
t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2,
t->flags, t->tramp_data);
if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
kill(os_getpid(), sig);
_exit(0);
}
int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
int clone_flags, int (*tramp)(void *))
{
struct tramp arg;
unsigned long sp;
int new_pid, status, err;
/* The trampoline will run on the temporary stack */
sp = stack_sp(temp_stack);
clone_flags |= CLONE_FILES | SIGCHLD;
arg.tramp = tramp;
arg.tramp_data = thread_arg;
arg.temp_stack = temp_stack;
arg.flags = clone_flags;
/* Start the process and wait for it to kill itself */
new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
if(new_pid < 0)
return(new_pid);
CATCH_EINTR(err = waitpid(new_pid, &status, 0));
if(err < 0)
panic("Waiting for outer trampoline failed - errno = %d",
errno);
if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
panic("outer trampoline didn't exit with SIGKILL, "
"status = %d", status);
return(arg.pid);
}
void forward_pending_sigio(int target)
{
sigset_t sigs;
if(sigpending(&sigs))
panic("forward_pending_sigio : sigpending failed");
if(sigismember(&sigs, SIGIO))
kill(target, SIGIO);
}
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