最近在调试几个问题时，发现跟abort函数有关，以前只是简单使用，现在却发现不简单，就多留意了下。

简介

abort中止当前进程并返回错误代码。异常终止一个进程。中止当前进程，返回一个错误代码。错误代码的缺省值是3。

代码

/***

*abort.c - abort a program by raising SIGABRT

*

*       Copyright (c) Microsoft Corporation. All rights reserved.

*

*Purpose:

*       defines abort() - print a message and raise SIGABRT.

*

*******************************************************************************/#include<cruntime.h>#include<stdlib.h>#include<internal.h>#include<awint.h>#include<rterr.h>#include<signal.h>#include<oscalls.h>#include<mtdll.h>#include<dbgint.h>#ifdef _DEBUG#define _INIT_ABORT_BEHAVIOR _WRITE_ABORT_MSG
#else  /* _DEBUG */
#define _INIT_ABORT_BEHAVIOR _CALL_REPORTFAULT
#endif  /* _DEBUG */unsignedint __abort_behavior =_INIT_ABORT_BEHAVIOR;/***

*void abort() - abort the current program by raising SIGABRT

*

*Purpose:

*   print out an abort message and raise the SIGABRT signal.  If the user

*   hasn't defined an abort handler routine, terminate the program

*   with exit status of 3 without cleaning up.

*

*   Multi-thread version does not raise SIGABRT -- this isn't supported

*   under multi-thread.

*

*Entry:

*   None.

*

*Exit:

*   Does not return.

*

*Uses:

*

*Exceptions:

*

*******************************************************************************/

void__cdecl abort (void)

{

    _PHNDLR sigabrt_act=SIG_DFL;



#ifdef _DEBUGif (__abort_behavior &_WRITE_ABORT_MSG)

    {/*write the abort message*/_NMSG_WRITE(_RT_ABORT);

    }#endif  /* _DEBUG */


    /*Check if the user installed a handler for SIGABRT.

     * We need to read the user handler atomically in the case

     * another thread is aborting while we change the signal

     * handler.*/sigabrt_act=__get_sigabrt();if (sigabrt_act !=SIG_DFL)

    {

        raise(SIGABRT);

    }/*If there is no user handler for SIGABRT or if the user

     * handler returns, then exit from the program anyway*/

    if (__abort_behavior &_CALL_REPORTFAULT)

    {#if defined (_M_ARM) || defined (_CRT_APP)__fastfail(FAST_FAIL_FATAL_APP_EXIT);#else  /* defined (_M_ARM) || defined (_CRT_APP) */
        if(IsProcessorFeaturePresent(PF_FASTFAIL_AVAILABLE))

            __fastfail(FAST_FAIL_FATAL_APP_EXIT);



        _call_reportfault(_CRT_DEBUGGER_ABORT, STATUS_FATAL_APP_EXIT, EXCEPTION_NONCONTINUABLE);#endif  /* defined (_M_ARM) || defined (_CRT_APP) */}/*If we don't want to call ReportFault, then we call _exit(3), which is the

     * same as invoking the default handler for SIGABRT*/_exit(3);

}/***

*unsigned int _set_abort_behavior(unsigned int, unsigned int) - set the behavior on abort

*

*Purpose:

*

*Entry:

*   unsigned int flags - the flags we want to set

*   unsigned int mask - mask the flag values

*

*Exit:

*   Return the old behavior flags

*

*Exceptions:

*   None

*

*******************************************************************************/unsignedint __cdecl _set_abort_behavior(unsigned int flags, unsigned intmask)

{

    unsignedint oldflags =__abort_behavior;

    __abort_behavior= oldflags & (~mask) | flags &mask;returnoldflags;

}

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