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