{"id":13902,"date":"2022-10-05T19:42:36","date_gmt":"2022-10-05T14:12:36","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-c-sdl-segmentation-fault-when-program-run-multiple-times-in-succession-closed\/"},"modified":"2022-10-05T19:42:36","modified_gmt":"2022-10-05T14:12:36","slug":"solved-c-sdl-segmentation-fault-when-program-run-multiple-times-in-succession-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-c-sdl-segmentation-fault-when-program-run-multiple-times-in-succession-closed\/","title":{"rendered":"[Solved] C\/SDL – Segmentation fault when program run multiple times in succession [closed]"},"content":{"rendered":"

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Let me break down a debugging session for you, but in future you better do that yourself.<\/p>\n

If the problem can be easily reproduced, it is quite trivial to fix it:<\/p>\n

gdb .\/GAME\n(gdb) r\nProgram received signal SIGSEGV, Segmentation fault.\n0x00007ffff7b2d10c in ?? () from \/usr\/lib\/x86_64-linux-gnu\/libSDL2-2.0.so.0\n(gdb) bt\n#0  0x00007ffff7b2d10c in ?? () from \/usr\/lib\/x86_64-linux-gnu\/libSDL2-2.0.so.0\n#1  0x000000000040650c in sprite_free_age ()\n#2  0x00000000004065f9 in AGE_SpriteLoad ()\n#3  0x0000000000402740 in BattlefieldLoad () at battlefield.c:89\n#4  0x0000000000402794 in BattlefieldInit (battlefield=0x1dca440, battlefieldId=1)\n    at battlefield.c:96\n#5  0x0000000000405349 in BattleInitialize (leftTeam=0x60dff0 <leftTeam>, \n    rightTeam=0x60e010 <rightTeam>, battlefieldId=1) at battle.c:13\n#6  0x0000000000401e8f in LoadContent () at main.c:90\n#7  0x0000000000401d2b in main (argc=1, argv=0x7fffffffdfc8) at main.c:49\n<\/code><\/pre>\n
It crashed within SDL, and last thing that called it is sprite_free_age<\/code>. What’s here (AGE\/AGE_Sprite.c<\/code>):<\/p>\n
void sprite_free_age(AGE_Sprite *sprite)\n{\n    if( sprite->texture != NULL )\n    {\n        SDL_DestroyTexture( sprite->texture );\n        sprite->texture = NULL;\n        sprite->Width = 0;\n        sprite->Height = 0;\n    }\n}\n<\/code><\/pre>\n
The only SDL call is SDL_DestroyTexture<\/code>, and NULL check is performed, which means sprite<\/code> have garbage data (not NULL but still not an SDL texture but rather something else). It was called from AGE_SpriteLoad<\/code>:<\/p>\n
bool AGE_SpriteLoad(AGE_Sprite *sprite, char *path)\n{\n    sprite_free_age(sprite);\n\n    SDL_Texture *finalTexture = NULL;\n    SDL_Surface *loadedSurface = IMG_Load(path);\n\n    \/\/ ... the rest is omitted\n<\/code><\/pre>\n
So whenever you call AGE_SpriteLoad<\/code>, it first tries to drop previous sprite it may’ve contained. It was called from BattlefieldLoad<\/code> at battlefield.c:89<\/code>:<\/p>\n
void BattlefieldLoad()\n{\n    assert(AGE_SpriteLoad(&squareWalkable, \"Resources\/Battlefield\/SquareWalkable.png\"));\n    assert(AGE_SpriteLoad(&squareSelected, \"Resources\/Battlefield\/SquareSelected.png\"));\n    assert(AGE_SpriteLoad(&squareEnemy, \"Resources\/Battlefield\/SquareEnemy.png\"));\n    assert(AGE_SpriteCreateBlank(&battlefieldField, LevelWidth, LevelHeight, SDL_TEXTUREACCESS_TARGET));\n    AGE_ListInit(&objectsList, sizeof(AGE_Sprite));\n    AGE_Sprite objectSprite;\n    int i;\n    char buffer[100];\n\n    for (i = 0; i < BATTLEFIELD_OBJECTS_COUNT; ++i)\n    {\n        snprintf(buffer, sizeof(buffer), \"Resources\/Battlefield\/Object_%d.png\", i+1);\n        AGE_SpriteLoad(&objectSprite, buffer);\n        AGE_ListAdd(&objectsList, &objectSprite);\n    }\n}\n<\/code><\/pre>\n
Here you have uninitialised AGE_Sprite objectSprite<\/code>, and you’re calling AGE_SpriteLoad<\/code> on it, which tries to drop old data (which is uninitialised => garbage) and (maybe) crashes. First thing coming to mind is that you need to set objectSprite<\/code> to zero-bytes, either with memset<\/code> or just by initialising it upon declaration, e.g. AGE_Sprite objectSprite = {};<\/code>.<\/p>\n<\/p><\/div>\n
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solved C\/SDL – Segmentation fault when program run multiple times in succession [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Let me break down a debugging session for you, but in future you better do that yourself. If the problem can be easily reproduced, it is quite trivial to fix it: gdb .\/GAME (gdb) r Program received signal SIGSEGV, Segmentation fault. 0x00007ffff7b2d10c in ?? () from \/usr\/lib\/x86_64-linux-gnu\/libSDL2-2.0.so.0 (gdb) bt #0 0x00007ffff7b2d10c in ?? () … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,2594,1187],"class_list":["post-13902","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-sdl","tag-segmentation-fault"],"yoast_head":"\n[Solved] C\/SDL - Segmentation fault when program run multiple times in succession [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-c-sdl-segmentation-fault-when-program-run-multiple-times-in-succession-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] C\/SDL - Segmentation fault when program run multiple times in succession [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Let me break down a debugging session for you, but in future you better do that yourself. If the problem can be easily reproduced, it is quite trivial to fix it: gdb .\/GAME (gdb) r Program received signal SIGSEGV, Segmentation fault. 0x00007ffff7b2d10c in ?? () from \/usr\/lib\/x86_64-linux-gnu\/libSDL2-2.0.so.0 (gdb) bt #0 0x00007ffff7b2d10c in ?? () ... 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If the problem can be easily reproduced, it is quite trivial to fix it: gdb .\/GAME (gdb) r Program received signal SIGSEGV, Segmentation fault. 0x00007ffff7b2d10c in ?? () from \/usr\/lib\/x86_64-linux-gnu\/libSDL2-2.0.so.0 (gdb) bt #0 0x00007ffff7b2d10c in ?? () ... 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