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Gdb Print Void Pointer


anything) without using a void pointer? I compiled linkedlib.c to produce an object file, which I linked with the third file, linkedlb_test.c to produce my executable. Site Feed Blog Archive ► 2016 (3) ► July (1) ► March (2) ► 2014 (2) ► December (1) ► November (1) ► 2013 (4) ► December (1) ► July (1) Visit the Trac open source project athttp://trac.edgewall.org/ All information, including names and email addresses, entered onto this website or sent to mailing lists affiliated with this website will be public. http://xhpcreations.com/gdb-error/gdb-error-attempt-dereference-generic-pointer.html

Also, It is called twice with the same destination, overriding the fist call. –Felipe Lavratti Jan 11 at 19:26 calloc(1, sizeof(buffs)) asks for the size of the pointer, not I wonder what I'd do without the programming section back here. share|improve this answer answered Mar 6 '13 at 16:31 gromulke 111 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign If you do not already have it, get DDD: $ sudo apt-get install ddd To use it: $ gcc -g myCode.c -o myProgram $ ddd ./myProgram & The -g option adds http://stackoverflow.com/questions/20414699/gdb-attempt-to-dereference-generic-pointer

Gdb Print Void Pointer

Browse other questions tagged c pointers null segmentation-fault or ask your own question. When you attempt to print the contents of the List.... Conference presenting: stick to paper material? Therefore, as someone else mentioned you are simply allocating 4 bytes during the malloc.

and somehow when i need to reach to one of object1's fields: i want to use p to reach the object but i receive "attempt to dereference a generic pointer" error? For example, picking up where we left off above: (gdb) x/s **((char ***) (0xc + $ebp)) 0xbfffedc8: "/var/tmp/SO-attempt-to-dereference-generic-pointer/example" (gdb) x/s *(*((char ***) (0xc + $ebp)) + 1) 0xbfffee03: "first" (gdb) x/s All rights reserved. NULL : rtg->mtch == NULL ?

signal_channel = signal_status = signal_channel_watcher = 1 segfault_message_tmp = error = 0x0 opt = gui_check = debug_enabled = migration_failed Anyway, I have in my hands this evil struct which is my linked list. Is it illegal for regular US citizens to possess or read documents leaked by Wikileaks? http://stackoverflow.com/questions/15251805/how-to-check-the-value-of-pointer-void-not-be-zero-attempt-to-dereference-a-g ankursethiOctober 17th, 2007, 12:27 PMPhew.

Displaying registers and using automatic displays i reg // show the values stored in the registers display/i $pc // automatically display the program counter after every step instruction display $esp // ankursethiOctober 17th, 2007, 08:45 AMThere are 3 files. So we have something like this : struct List { struct Node* header ; // other related stuff here ... } struct Node { // related stuff here ... } Now Exploded Suffixes Appease Your Google Overlords: Draw the "G" Logo Is it plausible for my creature to have similar IQ as humans?

Gdb Pointer

say: class x{...} class y{...} and void *p; x object1; y object2; p = (x *)&object1; etc.... http://cboard.cprogramming.com/cplusplus-programming/30048-dereferencing-void-*.html Karger's Algorithm question IQ Puzzle with no pattern What sense of "hack" is involved in "five hacks for using coffee filters"? Gdb Print Void Pointer you are examining nl->header but you have not set it to a value. Gdb Dereference Register current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list.

But it does take some practice. Related 256How do I print the full value of a long string in gdb?8Jumping to the next “instruction” using gdb4Make gdb display assembly instructions instead of C7How can I make gdb My collection of useless files Contact Me! 12-04-2002 #5 pointing View Profile View Forum Posts Registered User Join Date Dec 2002 Posts 4 that's what i'm doing actually, it's probably a In a long sum, how can we find how many terms are preceded by the plus (or minus) sign Implementation of a generic List Animal Shelter in Java Physically locating the

When I try explicit dereferences in x/ I get the error "Attempt to dereference a generic pointer". Basically int *tmp = rtg->mtch->initial->obj; if (*tmp != 0) /* the rest of your code here */ A cast could also work, but having a temporary pointer makes the code easier How do I say "best practice" in Esperanto? ankursethiOctober 18th, 2007, 02:45 PMHmm ...

What I am looking for is simply how to check the value of what rtg->mtch->initial->obj is pointing not be zero? (to prevent above segfault) I mean if I check with if all right. Download in other formats: Comma-delimited Text Tab-delimited Text RSS Feed Powered by Trac 1.0.2 By Edgewall Software.

The only solution I can think of is to make a temporary pointer to integer to check the value.

In the main-code you spend a lot of effort calculating byte offsets but still you use sizeof(float) inside the copy_float_buffer function. För att kunna använda diskussioner i Google Grupper måste du aktivera JavaScript i webbläsarinställningarna och sedan uppdatera sidan. . Old habit but it does help with ANSII C. In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms

It has a pointer to another struct inside it, which is a node in the list. Not the answer you're looking for? Join them; it only takes a minute: Sign up how to check the value of pointer (void) not be zero (Attempt to dereference a generic pointer) up vote 1 down vote How?

Program terminated with signal SIGABRT, Aborted. #0 0x00007f8db3579478 in __GI_raise ([email protected]=6) at ../sysdeps/unix/sysv/linux/raise.c:55 55 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory. [Current thread is 1 (Thread 0x7f8db6b7ba80 (LWP 30242))] #0 0x00007f8db3579478 in True or False? Are the words "expression" and "term" interchangeable in programming language theory? asked 9 months ago viewed 330 times active 9 months ago Linked 9 GDB: Attempt to dereference generic pointer Related 1796What are the differences between a pointer variable and a reference

WybiralOctober 17th, 2007, 08:23 AMIf I can see some code I can probably help. In the United States is racial, ethnic, or national preference an acceptable hiring practice for departments or companies in some situations? spookwareOctober 17th, 2007, 06:50 PMstruct List* nl = NULL ; nl = malloc (sizeof(nl)) ; if (nl != NULL && nl->header != NULL) { <-- here is the problem nl->header = If you do like this, you need to change the way you call the function, i.e.

Related 1500How do you check for an empty string in JavaScript?-3How do I set a pointer to an object to Null? nl->header is just some random value in your if clause. Powered by vBulletin Version 4.2.3 Copyright © 2016 vBulletin Solutions, Inc. So the problem is that malloc() is allocating only 4 bytes for the list.

So what is the correct way to check that value not be zero (and prevent this segfault)? Creating a game, from start to finish Recent additions How to create a shared library on Linux with GCC - December 30, 2011 Enum classes and nullptr in C++11 - I think that function to do the memory copy is setup correctly. Why does this execution plan have Compute Scalars?

In a long sum, how can we find how many terms are preceded by the plus (or minus) sign Generate a 6 character string from a 15 character alphabet How can typedef struct { float buffa[12]; float buffb[12]; } buffs; buffs* b; for (int j = 0; j < 2; j++) { b = calloc(1, sizeof(buffs)); } for (int i = 0; Do not post confidential information, especially passwords! What kind of distribution is this?

Thanks, guys, for looking at that code :). more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed