VC下如何是用进程信号编程？最好能给个简单例子，谢谢
VC下如何是用进程信号编程？最好能给个简单例子，谢谢
[解决办法]
/* FPRESET.C: This program uses signal to set up a * routine for handling floating-point errors. */#include <stdio.h>#include <signal.h>#include <setjmp.h>#include <stdlib.h>#include <float.h>#include <math.h>#include <string.h>jmp_buf mark; /* Address for long jump to jump to */int fperr; /* Global error number */void __cdecl fphandler( int sig, int num ); /* Prototypes */void fpcheck( void );void main( void ){ double n1, n2, r; int jmpret; /* Unmask all floating-point exceptions. */ _control87( 0, _MCW_EM ); /* Set up floating-point error handler. The compiler * will generate a warning because it expects * signal-handling functions to take only one argument. */ if( signal( SIGFPE, fphandler ) == SIG_ERR ) { fprintf( stderr, "Couldn't set SIGFPE\n" ); abort(); } /* Save stack environment for return in case of error. First * time through, jmpret is 0, so true conditional is executed. * If an error occurs, jmpret will be set to -1 and false * conditional will be executed. */ jmpret = setjmp( mark ); if( jmpret == 0 ) { printf( "Test for invalid operation - " ); printf( "enter two numbers: " ); scanf( "%lf %lf", &n1, &n2 ); r = n1 / n2; /* This won't be reached if error occurs. */ printf( "\n\n%4.3g / %4.3g = %4.3g\n", n1, n2, r ); r = n1 * n2; /* This won't be reached if error occurs. */ printf( "\n\n%4.3g * %4.3g = %4.3g\n", n1, n2, r ); } else fpcheck();}/* fphandler handles SIGFPE (floating-point error) interrupt. Note * that this prototype accepts two arguments and that the * prototype for signal in the run-time library expects a signal * handler to have only one argument. * * The second argument in this signal handler allows processing of * _FPE_INVALID, _FPE_OVERFLOW, _FPE_UNDERFLOW, and * _FPE_ZERODIVIDE, all of which are Microsoft-specific symbols * that augment the information provided by SIGFPE. The compiler * will generate a warning, which is harmless and expected. */void fphandler( int sig, int num ){ /* Set global for outside check since we don't want * to do I/O in the handler. */ fperr = num; /* Initialize floating-point package. */ _fpreset(); /* Restore calling environment and jump back to setjmp. Return * -1 so that setjmp will return false for conditional test. */ longjmp( mark, -1 );}void fpcheck( void ){ char fpstr[30]; switch( fperr ) { case _FPE_INVALID: strcpy( fpstr, "Invalid number" ); break; case _FPE_OVERFLOW: strcpy( fpstr, "Overflow" ); break; case _FPE_UNDERFLOW: strcpy( fpstr, "Underflow" ); break; case _FPE_ZERODIVIDE: strcpy( fpstr, "Divide by zero" ); break; default: strcpy( fpstr, "Other floating point error" ); break; } printf( "Error %d: %s\n", fperr, fpstr );}OutputTest for invalid operation - enter two numbers: 5 0Error 131: Divide by zero