wine/loader/signal.c
1998-12-31 15:52:06 +00:00

200 lines
4.9 KiB
C

/*
* Wine signal handling
*
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <setjmp.h>
#include <sys/time.h>
#include <sys/timeb.h>
#include <sys/types.h>
#include <sys/wait.h>
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYSCALL_H
# include <syscall.h>
#else
# ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
# endif
#endif
#include "miscemu.h"
#include "selectors.h"
#include "sig_context.h"
#include "winsock.h"
/* Linux sigaction function */
#if defined(linux) && defined(__i386__)
/* This is the sigaction structure from the Linux 2.1.20 kernel. */
#undef sa_handler
struct kernel_sigaction
{
void (*sa_handler)();
unsigned long sa_mask;
unsigned long sa_flags;
void (*sa_restorer)();
};
/* Similar to the sigaction function in libc, except it leaves alone the
restorer field, which is used to specify the signal stack address */
static __inline__ int wine_sigaction( int sig, struct kernel_sigaction *new,
struct kernel_sigaction *old )
{
#ifdef __PIC__
__asm__ __volatile__( "pushl %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx"
: "=a" (sig)
: "0" (SYS_sigaction),
"g" (sig),
"c" (new),
"d" (old) );
#else
__asm__ __volatile__( "int $0x80"
: "=a" (sig)
: "0" (SYS_sigaction),
"b" (sig),
"c" (new),
"d" (old) );
#endif /* __PIC__ */
if (sig>=0)
return 0;
errno = -sig;
return -1;
}
#endif /* linux && __i386__ */
/* Signal stack */
static char SIGNAL_Stack[16384];
static sigset_t async_signal_set;
/**********************************************************************
* SIGNAL_child
*
* wait4 terminated child processes
*/
static HANDLER_DEF(SIGNAL_child)
{
HANDLER_INIT();
#ifdef HAVE_WAIT4
wait4( 0, NULL, WNOHANG, NULL);
#elif defined (HAVE_WAITPID)
/* I am sort-of guessing that this is the same as the wait4 call. */
waitpid (0, NULL, WNOHANG);
#else
wait(NULL);
#endif
}
/**********************************************************************
* SIGNAL_SetHandler
*/
void SIGNAL_SetHandler( int sig, void (*func)(), int flags )
{
int ret;
#if defined(linux) && defined(__i386__)
struct kernel_sigaction sig_act;
sig_act.sa_handler = func;
sig_act.sa_flags = SA_RESTART | (flags) ? SA_NOMASK : 0;
sig_act.sa_mask = 0;
/* Point to the top of the stack, minus 4 just in case, and make
it aligned */
sig_act.sa_restorer =
(void (*)())((int)(SIGNAL_Stack + sizeof(SIGNAL_Stack) - 4) & ~3);
ret = wine_sigaction( sig, &sig_act, NULL );
#else /* linux && __i386__ */
struct sigaction sig_act;
sig_act.sa_handler = func;
sigemptyset( &sig_act.sa_mask );
# if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
sig_act.sa_flags = SA_ONSTACK;
# elif defined (__svr4__) || defined(_SCO_DS)
sig_act.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART;
# elif defined(__EMX__)
sig_act.sa_flags = 0; /* FIXME: EMX has only SA_ACK and SA_SYSV */
# else
sig_act.sa_flags = 0;
# endif
ret = sigaction( sig, &sig_act, NULL );
#endif /* linux && __i386__ */
if (ret < 0)
{
perror( "sigaction" );
exit(1);
}
}
extern void stop_wait(int a);
extern void WINSOCK_sigio(int a);
extern void ASYNC_sigio(int a);
/**********************************************************************
* SIGNAL_Init
*/
BOOL32 SIGNAL_Init(void)
{
#ifdef HAVE_WORKING_SIGALTSTACK
struct sigaltstack ss;
ss.ss_sp = SIGNAL_Stack;
ss.ss_size = sizeof(SIGNAL_Stack);
ss.ss_flags = 0;
if (sigaltstack(&ss, NULL) < 0)
{
perror("sigstack");
return FALSE;
}
#endif /* HAVE_SIGALTSTACK */
sigemptyset(&async_signal_set);
SIGNAL_SetHandler( SIGCHLD, (void (*)())SIGNAL_child, 1);
#ifdef CONFIG_IPC
sigaddset(&async_signal_set, SIGUSR2);
SIGNAL_SetHandler( SIGUSR2, (void (*)())stop_wait, 1); /* For IPC */
#endif
#ifdef SIGIO
sigaddset(&async_signal_set, SIGIO);
/* SIGNAL_SetHandler( SIGIO, (void (*)())WINSOCK_sigio, 0); */
SIGNAL_SetHandler( SIGIO, (void (*)())ASYNC_sigio, 0);
#endif
sigaddset(&async_signal_set, SIGALRM);
/* ignore SIGPIPE so that WINSOCK can get a EPIPE error instead */
signal (SIGPIPE, SIG_IGN);
return TRUE;
}
/**********************************************************************
* SIGNAL_MaskAsyncEvents
*/
void SIGNAL_MaskAsyncEvents( BOOL32 flag )
{
sigprocmask( (flag) ? SIG_BLOCK : SIG_UNBLOCK , &async_signal_set, NULL);
}