Hello, I am porting a C program.
The problem I've met is SIGSEGV on free(). I can't see what's the root cause
of it.
it doesn't occur sometimes, but very often.
I am testing it on NexusOne 2.2.1
I am using Android NDK r5b and Android SDK and Eclipse ADT and Cygwin.
I am using *android.content.res.AssetFileDescriptor* to read assets in C
modules.
Here is the messages in ndk-gdb when the problem appears.
> (gdb) c
> Continuing.
>
> Breakpoint 2, Java_kr_co_pkbio_Unse_DangSaJuShinSal (env=0xaa50,
> obj=0x4495b970)
> at
> C:/DEWR/Product/Software-Engineering/Eclipse-Workspace/Unse/jni/unse.c:1
> 83
> *1083 free(strBuf);*
> (gdb) next
>
> *Program received signal SIGSEGV, Segmentation fault.*
> *0xafd11c80 in __libc_android_abort ()*
> from
> C:/DEWR/Product/Software-Engineering/Eclipse-Workspace/Unse/obj/local/a
> meabi/libc.so
> (gdb) bt
> #0 0xafd11c80 in __libc_android_abort ()
> from
> C:/DEWR/Product/Software-Engineering/Eclipse-Workspace/Unse/obj/local/a
> meabi/libc.so
> #1 0xbec233bc in ?? ()
> Cannot access memory at address 0xc
> (gdb) quit
>
Here is the Java source code...
> public static FileInfoForNativeCode openAssets(String fname) {
> if (Constants.VERBOSE_LOGS)
> Log.d(TAG, "openAssets("+fname+")");
>
> *AssetFileDescriptor myDescriptor = null;*
> try {
> myDescriptor = context.getAssets().openFd(fname+".jet");
> } catch (IOException e) {
> e.printStackTrace();
> return null;
> }
> FileDescriptor fd = myDescriptor.getFileDescriptor();
> long off = myDescriptor.getStartOffset();
> long len = myDescriptor.getLength();
>
> if (Constants.VERBOSE_LOGS)
> Log.d(TAG, "fd:"+fd+" off:"+off+" len:"+len);
>
> return new FileInfoForNativeCode(off, len, fd);
> }
>
Here is the C source code...
> char* getTextByIndex (TextFileBufType *filebuf, char *index) {
> #define _INDEX_PREFIX_ '@'
> int i, j, lenBuf;
> char *result;
> char indexPrefix = _INDEX_PREFIX_;
> int lenIndexPrefix = utf8len( &indexPrefix );
> int lenIndex = strlen(index);
>
> for ( i = 0 ; i < filebuf->total ; i++ ) {
> *//__android_log_print(ANDROID_LOG_DEBUG,"TAG", "JNI : %d -> %s",
> i, filebuf->text[i]);*
>
> if ( memcmp (filebuf->text[i], &indexPrefix, lenIndexPrefix) != 0 )
> continue;
>
> if ( memcmp (filebuf->text[i]+lenIndexPrefix, index, lenIndex) != 0
> )
> continue;
>
> lenBuf = 0;
> lenBuf += strlen(filebuf->text[i]);
> lenBuf++;
> for ( j = i+1 ; j < filebuf->total ; j++ ) {
> if ( memcmp (filebuf->text[j], &indexPrefix, lenIndexPrefix) ==
> 0 )
> break;
>
> lenBuf += strlen(filebuf->text[j]);
> lenBuf++;
> }
>
> *result = malloc(lenBuf);*
> result[0] = 0;
> strcat(result, filebuf->text[i]);
> strcat(result, "\n");
> for ( j = i+1 ; j < filebuf->total ; j++ ) {
> if ( memcmp (filebuf->text[j], &indexPrefix, lenIndexPrefix) ==
> 0 )
> break;
>
> strcat(result, filebuf->text[j]);
> strcat(result, "\n");
> }
>
> *//__android_log_print(ANDROID_LOG_DEBUG,"TAG", "JNI : %d!!! ->
> %s", i, filebuf->text[i]);*
> *return result;*
> }
>
> return NULL;
>
> #undef _INDEX_PREFIX_
> }
>
> inline void readyFileInFile (FileInFile *fif, char *path)
> {
> jstring jstrFpath;
> jobject finfo;
> jobject descriptor;
>
> jstrFpath = (*gEnv)->NewStringUTF(gEnv, path);
> finfo = (*gEnv)->CallStaticObjectMethod(gEnv, clsUtility,
> midOpenAssets, jstrFpath);
> fif->offset = (*gEnv)->GetLongField(gEnv, finfo, fidOffset);
> fif->length = (*gEnv)->GetLongField(gEnv, finfo, fidLength);
> descriptor = (*gEnv)->GetObjectField(gEnv, finfo, fidDescriptor);
> fif->fd = (*gEnv)->GetIntField(gEnv, descriptor,
> fidDescriptorFileDescriptor);
> }
>
> jobjectArray Java_kr_co_pkbio_Unse_DangSaJuShinSal (JNIEnv *env, jobject
> obj) {
> *// char *fname = "DangSaJu_ShinSal";*
> int i, fileno[4], ret_code, type;
> char temp[256];
> char *header[4] = { "년", "월", "일", "시" };
> char table1[12] = { 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2 };
> char table2[4] = {10, 7, 4, 1};
>
> char *index[12] = {
> "겁살", "재살", "천살", "지살", "연살", "월살",
> "망신살", "장성살", "반안살", "역마살", "육해살", "화개살"
> };
>
> int r_option;
> int numBytesRead;
> char *strBuf;
> TextFileBufType filebuf;
> jstring buf_output[4];
> jobjectArray output;
> FileInFile fif;
>
> gEnv = env;
>
> */* 년월일시에 대한 겁살을 계산한다 */*
> type = table1[BaseInfo.saju.day % 12];
> fileno[0] = (table2[type] + (BaseInfo.saju.year % 12)) % 12;
> fileno[1] = (table2[type] + (BaseInfo.saju.month % 12)) % 12;
> fileno[2] = (table2[type] + (BaseInfo.saju.day % 12)) % 12;
> fileno[3] = (table2[type] + (BaseInfo.saju.hour % 12)) % 12;
> */*WriteMsg (" - 기본위치 : 생일지지(%s) --> type:%d --> 자(%s)에 대한 살:%s\n",
> JeeJeeStr[BaseInfo.saju.day % 12], type, JeeJeeStr[0],
> index[table2[type]]);
> WriteMsg (" - 년살 : 생년지지(%s) --> 년%s\n",
> JeeJeeStr[BaseInfo.saju.year % 12],
> index[fileno[0]]);
> WriteMsg (" - 월살 : 생월지지(%s) --> 월%s\n",
> JeeJeeStr[BaseInfo.saju.month % 12],
> index[fileno[1]]);
> WriteMsg (" - 일살 : 생일지지(%s) --> 일%s\n", JeeJeeStr[BaseInfo.saju.day
> % 12],
> index[fileno[2]]);
> WriteMsg (" - 시살 : 생시지지(%s) --> 시%s\n",
> JeeJeeStr[BaseInfo.saju.hour % 12],
> index[fileno[3]]);*/*
>
>
> readyFileInFile(&fif, "data/DangSaJu5.dat");
>
> r_option = ((int)'#' << 8) & 0xFF00; /* Comment char setting */
> r_option |= (RT_OPT_RMCMT | RT_OPT_RMCRLF | RT_OPT_LTRIM | RT_OPT_RTRIM
> | RT_OPT_SPACES);
>
> if ( ReadTextFileToBufA (&filebuf, &fif, r_option) < 0 ) {
> __android_log_print(ANDROID_LOG_ERROR,"TAG", "JNI : 서버측에서 치명적인 오류가
> 발생하여 더이상 진행할 수 없습니다.");
> return NULL;
> }
>
> for ( i = 0 ; i < 4 ; i++ ) {
> sprintf (temp, "%s%s", header[i], index[fileno[i]]);
> *strBuf = getTextByIndex(&filebuf, temp);*
> *//__android_log_print(ANDROID_LOG_DEBUG,"TAG", "JNI : %s -> %s",
> temp, strBuf );*
> buf_output[i] = (*gEnv)->NewStringUTF(gEnv, strBuf);
> * free(strBuf); //line number : 1083 ***It doesn't cause SIGSEGV on
> first for-loop-round, but on third for-round.****
> *//PrintTextFile3 ("../data/DangSaJu5.dat", temp, VIEW_T_R_STR,
> // "12신살로 알아보는 인생의 길흉화복 : %s", temp);
> /*if (i < 3) {
> sprintf (temp, "\n 계속해서 %s%s에 대한 풀이를 보시겠습니까? (Y/n)",
> header[i+1], index[fileno[i+1]]);
> ret_code = GetYesNo (temp, GETYN_YES);
> if (ret_code == GETYN_NO) return;
> }*/*
> }
>
> FreeTextFileBuf (&filebuf);
> *//printf ("\n [Enter]키를 누르세요."); fflush(stdout);
> //PauseUntil (300, 0);*
> *#if defined (_DO_NOT_COMPILE_)
> {
> int j;
> for (i=0 ; i<4 ; i++) {
> for (j=0 ; j<12 ; j++) {
> sprintf (temp, "%s%s", header[i], index[j]);
> ** //PrintTextFile3 ("../data/DangSaJu5.dat", temp,
> VIEW_T_R_STR,
> // "당사주 / 인생 길흉화복 datafile test : %s", temp);
> }
> }
> }
> #endif*
>
> output = (*gEnv)->NewObjectArray(gEnv, 4, clsString, NULL);
> (*gEnv)->SetObjectArrayElement(gEnv, output, 0, buf_output[0]);
> (*gEnv)->SetObjectArrayElement(gEnv, output, 1, buf_output[1]);
> (*gEnv)->SetObjectArrayElement(gEnv, output, 2, buf_output[2]);
> (*gEnv)->SetObjectArrayElement(gEnv, output, 3, buf_output[3]);
>
> return output;
> }
>
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