The problem is that you’re attempting to modify a string literal. Doing so causes your program’s behavior to be undefined. Saying that you’re not allowed to modify a string literal is an oversimplification. Saying that string literals are const is incorrect; they’re not. WARNING : Digression follows. The string literal “this is a test” is … Read more
Your typedef defines Truck as a struct struck *, i.e. a pointer. So it’s size will be 4 or 8 depending on the architecture and not the size of the struct Use sizeof(*Truck) to get the actual size of the struct. You also need to allocate memory for the characters. The easiest way would be … Read more
I’ve been running into a problem where somehow my code is causing segmentation faults before any of my main actually runs. Usually, this means that the data structures that your main tries to place in the automatic storage area overflow the stack. In your situation, it looks like the GRAPH is a suitable suspect to … Read more
You can only longjmp() back up the call stack. The call to longjmp(b_buf, 1) is where things start to go wrong, because the stack frame referenced by b_buf no longer exists after the longjmp(a_buf). From the documentation for longjmp: The longjmp() routines may not be called after the routine which called the setjmp() routines returns. … Read more
There are two common kinds of SEGV, which is an error that results from an invalid memory access: A page was accessed which had the wrong permissions. E.g., it was read-only but your code tried to write to it. This will be reported as SEGV_ACCERR. A page was accessed that is not even mapped into … Read more
I got similar problem upgrading to JDK 1.6_18 and it seems solved using the following options: -server -Xms256m -Xmx748m -XX:MaxPermSize=128m -verbose:gc -XX:+PrintGCTimeStamps -Xloggc:/tmp/gc.log -XX:+PrintHeapAtGC -XX:+PrintGCDetails -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=”/tmp” -XX:+UseParallelGC -XX:-UseGCOverheadLimit # Following options just to remote monitoring with jconsole, useful to see JVM behaviour at runtime -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=12345 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=MyHost I still didn’t double check … Read more
A char[ROWS][COLS+1] cannot be cast into a char**. The input argument of print_map should be void print_map(char map[][COLS+1]) or void print_map(char (*map)[COLS+1]) The difference being that a char** means to point to something that can be dereferenced like this: (char**)map | v +——–+——–+——+——–+– … | 0x1200 | 0x1238 | NULL | 0x1200 | +—-|—+—-|—+–|—+—-|—+– … … Read more
The SIGSEGV signal indicates a “segmentation violation” or a “segfault”. More or less, this equates to a read or write of a memory address that’s not mapped in the process. This indicates a bug in your program. In a Python program, this is either a bug in the interpreter or in an extension module being … Read more
glewExperimental = GL_TRUE; glewInit(); Should do the magic Experimental Drivers GLEW obtains information on the supported extensions from the graphics driver. Experimental or pre-release drivers, however, might not report every available extension through the standard mechanism, in which case GLEW will report it unsupported. To circumvent this situation, the glewExperimental global switch can be turned … Read more
Allocate memory before using the pointer. If you don’t allocate memory *point = 12 is undefined behavior. int *fun() { int *point = malloc(sizeof *point); /* Mandatory. */ *point=12; return point; } Also your printf is wrong. You need to dereference (*) the pointer. printf(“%d”, *ptr); ^