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Bus Error In C


Similarly, if multi-byte accesses must be 32-bit aligned, addresses 0, 4, 8, 12, and so on would be considered aligned and therefore accessible, and all addresses in between would be considered I feel this may indeed be a better solution. –GeekyOmega Jul 30 '12 at 19:45 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign Faq Reply With Quote Share This Thread  Tweet This + 1 this Post To Linkedin Subscribe to this Thread  Subscribe to This Thread « Previous Thread | Next Thread Forget I mentioned it.

If you read/write memory you don't own it does not give you a Seg fault in C. –Thunderboltz May 8 '09 at 7:07 On the contrary overwriting a memory Weirder yet is that it complies. This was such a stupid mistake and I fixed it. This book is dated, but it remains very useful, and no C text that I've seen is more succinct.

Bus Error Linux

On the other side, you read 2 times 256 bytes, and you lose the first 256. I searched google for a cause, but came up with some conflicting reports... This answered my question. share|improve this answer answered Oct 17 '08 at 14:57 Mark Baker 3,66211823 1 My i7 certainly has an MMU, but I still came across this error while learning C on

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share|improve this answer edited Jul 30 '12 at 19:40 answered Jul 30 '12 at 18:35 pb2q 37.4k1187113 array[] doesn't exist anyway :( –Martin James Jul 30 '12 at 18:37 Binomial coefficients and "missing primes" Two resistors in series Ignore sudo in bash script Word to describe object that can be physically passed through At age 25, is it still okay share|improve this answer answered Nov 19 '15 at 13:56 Alleo 1,3361422 add a comment| up vote 0 down vote This could refer to human problems too. Bus Error Vs Segmentation Fault Segmentation faults happen for instance when you do an access that violate the segmentation rules, i.e.

So my question is simple, why is this C code giving me this bus error msg? #include #include //Preprocessed Functions void jumblegame(); void readFile(char* [], int); int main(int argc, char* argv[]) Linux Bus Error (core Dumped) It says: zsh: bus error ./blah My code is below. I found a particular useful posts on bus errors in general, see here. sptr = (short *)(((char *)sptr) + 1); *sptr = 100; */ return 0; } Compiling and running the example on a POSIX compliant OS on x86 demonstrates the error: $ gcc

Attempts to branch to an odd address results in a specification exception.[1] Data, however, may be retrieved from any address in memory, and may be one byte or longer depending on Bus Error 10 Mac How fast is Time running in Majora's Mask? Systems tolerate this inefficient algorithm, as it is an essential feature for most software, especially string processing. SIGBUS is an implementation-defined hardware fault.

Linux Bus Error (core Dumped)

A bus error is trying to access memory that can't possibly be there. Join them; it only takes a minute: Sign up Bus error vs Segmentation fault up vote 26 down vote favorite 8 Difference between a bus error and a segmentation fault? Bus Error Linux Thus it cannot protect you from overwriting memory within the same program. How To Debug Bus Error via malloc) to you.

I know how to do all of that. To address bytes, they access memory at the full width of their data bus, then mask and shift to address the individual byte. asked 4 years ago viewed 2885 times active 4 years ago Upcoming Events 2016 Community Moderator Election ends in 4 days Linked 157 What is a bus error? 137 How do It is possible for CPUs to support this, but this functionality is rarely required directly at the machine code level, thus CPU designers normally avoid implementing it and instead issue bus How To Solve Bus Error In Linux

Join them; it only takes a minute: Sign up Why is this C code giving me a bus error? In general it means the CPU bus could not complete a command, or suffered a conflict, but that could mean a whole range of things depending on the environment and code Thank you. –GeekyOmega Jul 30 '12 at 19:46 add a comment| up vote 0 down vote You have at least a few problems: array[x] = fgets(line,256,file) This stores the address of Attempting to access a unit larger than a byte at an unaligned address can cause a bus error.

It's read-only, you don't have permission, etc... Sigbus Error Linux Finally, you're trying to copy the strings using =. Do all the exercises, and this won't seem so esoteric.

I really don't know.

You've used an address that's meaningless to the system, or the wrong kind of address for that operation. Attempting to access memory in a segment one isn't allowed to access. 2. This is almost always the result of dereferencing a pointer that contains an illegal value. Bus Error Python c share|improve this question edited May 2 '12 at 12:04 casperOne 58.5k10127204 asked May 8 '09 at 6:56 Thunderboltz 6303915 add a comment| 6 Answers 6 active oldest votes up vote

I recommend Kernighan&Ritchie's The C Programming Language, see also. A common example in C is: int c; scanf("%d", c); instead of the correct version: int c; scanf("%d", &c); An example from C++ is: int* p=new int[100]; cout<< p[100]; instead of How do I get the last lines of dust into the dustpan? Do Matrix Multiplication!

Note that this only covers physical memory addresses. Look very closely in your program for bizarre things like that. On ARM less than Arch V7, you will have your code have an alignment failure- and on V7, you can, IF your runtime is set for it, handle it with a FILE *file; file = fopen("words.txt","r"); //Check to make sure file can open if(file == NULL) { printf("Error: File does not open."); exit(1); } //Otherwise, read file into array else { while(!feof(file))//The

Texas, USA speed ticket as a European citizen, already left the country What does the letter 'u' mean in /dev/urandom? Should I report it? If no other hardware responds, the CPU raises an exception, stating that the requested physical address is unrecognized by the whole computer system. SIGBUS can also be caused by any general device fault that the computer detects, though a bus error rarely means that the computer hardware is physically broken—it is normally caused by

This antipattern is likely responsible for your program looping more than you might expect when reading the file. References[edit] ^ z/Architecture Principles of Operation, SA22-7832-04, Page 6-6, Fifth Edition (September, 2005) IBM Corporation, Poukeepsie, NY, Retrievable from http://publibfp.dhe.ibm.com/epubs/pdf/a2278324.pdf (Retrieved December 31, 2015) ^ https://groups.google.com/group/comp.unix.internals/browse_thread/thread/6369e8f923aedcb0/54f8ed15e326dc0[unreliable source?] v t e Operating Texan via Arizona, out of his element! because it has disappeared (e.g.

From: Here share|improve this answer answered Oct 17 '08 at 14:54 Oli 93.1k45160228 Depends on the nasty tricks you're doing with your code. Example[edit] This is an example of unaligned memory access, written in the C programming language with AT&T assembly syntax. #include int main(int argc, char **argv) { int *iptr; char *cptr; Functionality rules and clarity matters; if you can work a little elegance in there, you're stylin'.