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C QUESTIONS

C asm linux syscall in loop continue for ever
C asm linux syscall in loop continue for ever
I wish this helpful for you The syscall instruction clobbers registers rcx and r11. The compiler assumes their values are preserved, causing an infinite loop. Add these two to the clobber list to fix the problem:
TAG : c
Date : December 02 2020, 10:46 PM , By : user3045575
Problems building OpenSSL 1.1.1c using gcc version 4.3.3
Problems building OpenSSL 1.1.1c using gcc version 4.3.3
will be helpful for those in need Looks like the assembler was unable to recognize this syntax. After taking a look at other generated assembly files in the OpenSSL project, I found some lines of assembly code which were written in the same syntax wi
TAG : c
Date : December 02 2020, 10:46 PM , By : user3045567
How to get and store binary values for operations?
How to get and store binary values for operations?
Hope this helps There are two problems here. I'll cover the easy, superficial one first. Your code is almost correctly converting characters to their binary representation. It's creating that representation as a string. (This probably isn't what you
TAG : c
Date : December 02 2020, 10:46 PM , By : user3045521
C FIFO crashes when writer goes faster than reader
C FIFO crashes when writer goes faster than reader
like below fixes the issue When the writer writes faster to the FIFO pipe than the reader can read, I get an exit error with the following message: "Terminated due to signal 13".
TAG : c
Date : December 01 2020, 04:52 PM , By : user3045197
How to print strings that have more consonants than vowels?
How to print strings that have more consonants than vowels?
it fixes the issue You are not resetting the initial values of the variables in the outer loop
TAG : c
Date : December 01 2020, 04:50 PM , By : user3044895
What's the difference between 1024 and 1024L while assigning variable?
What's the difference between 1024 and 1024L while assigning variable?
hope this fix your issue In C source code, 1024 is an int, and 1024L is a long int. During an assignment, the value on the right is converted to the type of the left operand. As long as the rules about which combinations of operands are obeyed and th
TAG : c
Date : December 01 2020, 04:47 PM , By : user3044619
Why ebpf program inside samples/bpf doesn't work?
Why ebpf program inside samples/bpf doesn't work?
it helps some times Because of the way load_bpf_file() loads the function, you need to put your BPF program function in a separate ELF section. For example, I could load the program with:
TAG : c
Date : December 01 2020, 04:47 PM , By : user3044589
Assignments in my linked list doesn't work
Assignments in my linked list doesn't work
Hope that helps I am trying to implement a linked list that inserts an item only if it's not already present in the list. If the item is present, ent_exists returns a pointer to that item. , As Weather Vane points out,
TAG : c
Date : December 01 2020, 04:45 PM , By : Ethan Zhao
Filling a multidimensional array with random bytes in one line in C
Filling a multidimensional array with random bytes in one line in C
it helps some times Stacks are limited in size. 8 MiB1 or smaller is common.If double is eight bytes and N is 1000, then double A[N][N]; requests 8 MiB. The stack in your C implementation is insufficient to provide this, so your program crashes.
TAG : c
Date : December 01 2020, 04:45 PM , By : bigbugbb
I need to rename the file, but I do not understand what is wrong, the file is encrypted, but the name does not change
I need to rename the file, but I do not understand what is wrong, the file is encrypted, but the name does not change
it should still fix some issue Don't know if I understand you completely, but I think you're trying to modify each byte as-is. Adapting this answer to your code, you could do something like below. NOTE: There is still much room for improvement and er
TAG : c
Date : December 01 2020, 04:45 PM , By : user3044109
Prevent read() systemcall returing with 0 when run as background process
Prevent read() systemcall returing with 0 when run as background process
With these it helps When stdin is not a terminal, read is returning with 0 because you are at the end of the file. read only blocks after reading all available input when there could be more input in the future, which is considered to be possible for
TAG : c
Date : December 01 2020, 04:40 PM , By : user3043556
How to use fused multiply and add in AVX for 16 bit packed integers
How to use fused multiply and add in AVX for 16 bit packed integers
This might help you x86 doesn't have SIMD-integer FMA / MAC (multiply-accumulate) other than horizontal pmaddubsw / pmaddwd which add horizontal into wider integers. (Until AVX512IFMA _mm_madd52lo_epu64 or AVX512_4VNNIW _mm512_4dpwssd_epi32(__m512i,
TAG : c
Date : December 01 2020, 04:40 PM , By : jbergoon
Type casting struct pointer
Type casting struct pointer
I wish this helpful for you You understanding is correct. The pointer *ip will point to buffer. char buffer[PCKT_LEN] is an array of size sizeof(char) * PCKT_LEN. Since a char is usually 1 byte long it is just a chunk of memory of PCKT_LEN bytes. PCK
TAG : c
Date : December 01 2020, 04:36 PM , By : edoura
How can I save the call stack from an exception handler in Cortex M4?
How can I save the call stack from an exception handler in Cortex M4?
will help you The best you can do, I think, is to find the address of the instruction that the handler would return to if it was allowed to return. This will usually be the instruction after the one that caused the fault, though this is not guarantee
TAG : c
Date : December 01 2020, 04:36 PM , By : robc
(Conditional?) creation of local variables in function
(Conditional?) creation of local variables in function
help you fix your problem The lifetime of a variable with automatic storage duration is until the end of the block. Storage will be guaranteed and it will retain constant address (i.e. the address given by e.g. ) until the end of the block, and after
TAG : c
Date : November 29 2020, 12:01 PM , By : Kyle
Is it possible to count the function (variable) arguments in a __cdecl with Inline ASM?
Is it possible to count the function (variable) arguments in a __cdecl with Inline ASM?
Any of those help The only possible way for this to work is with a unique sentinel value (e.g. a NULL pointer) that marks the last argument.This normally only works when all the args are pointers, e.g. as used by the POSIX execl(3) functions with sig
TAG : c
Date : November 28 2020, 12:01 PM , By : user3042391
Does C guarantee 32-bit integer arithmetic?
Does C guarantee 32-bit integer arithmetic?
To fix this issue Yes, the Standard guarantees this—if the operands are 32 bits wide. In C11, the Standard says:
TAG : c
Date : November 27 2020, 05:23 PM , By : user3042091
format specifier inside format specifier to change size of leading zeros
format specifier inside format specifier to change size of leading zeros
it fixes the issue I was thinking to solve my issue that is described in the following and then I ended with a question that I couldn't find an answer for it on Google. , Yes, it is possible. See * width specifier of printf. Example:
TAG : c
Date : November 27 2020, 12:01 PM , By : yagmurozel
How to do transactions using MongoDB C driver with FoundationDB Document Layer?
How to do transactions using MongoDB C driver with FoundationDB Document Layer?
Hope this helps Document layer doesn’t support transactions, yet. It used to expose FoundationDB transactions through some constructs different to MongoDB constructs. But they are disabled for a while.
TAG : c
Date : November 26 2020, 03:04 PM , By : user3041432
Array of structs doesn't take input properly
Array of structs doesn't take input properly
should help you out In scanf, %[^\n] doesn't skip whitespace. To skip whitespace (which should fix your issue), do this:
TAG : c
Date : November 26 2020, 12:01 PM , By : user3041292
Are assertions skipped when running in no debug mode?
Are assertions skipped when running in no debug mode?
This might help you I was wondering what actually happens with assertions when I have built my program and declared define NDEBUG before the header. , From the 2018 C standard, 7.2 1:
TAG : c
Date : November 26 2020, 12:01 PM , By : spufidoo
free memory used for struct in C but fails (code from C Primer Plus 6th Edition)
free memory used for struct in C but fails (code from C Primer Plus 6th Edition)
hope this fix your issue The variable is still available for use but the space allocated isn't so you will have undefined behavior. It can work now but it can crash later. A good practice is to set your pointer to NULL after freeing it.
TAG : c
Date : November 26 2020, 12:01 PM , By : user3041155
Is the meaning of l-value different in c and c++?
Is the meaning of l-value different in c and c++?
Hope this helps I was told that the array name is an non-modifiable l-value in C, but it is still confusing. , is an array name l-value? Yes, in both C and C++.
TAG : c
Date : November 26 2020, 12:01 PM , By : user3041103
How to convert 1D char to 2D int array and pass it int C?
How to convert 1D char to 2D int array and pass it int C?
hop of those help? For my school project i have to convert 1D char array to 2D int array and i have to send this array to another functions to work on it. but for some reason i cant create the 2D int array correctly or pass it to another functions. i
TAG : c
Date : November 26 2020, 06:28 AM , By : Impundu
Why does fputs() require a constant as first parameter and not fputc()?
Why does fputs() require a constant as first parameter and not fputc()?
Hope this helps The const modifier prevents the function from changing the input parameter.fputc function uses int c as input which is a value type. Because parameters are passed by value, the function can only change the internal copy, it could not
TAG : c
Date : November 26 2020, 06:23 AM , By : tulh
how to pass string as a function parameter
how to pass string as a function parameter
This might help you With hello(5,"i am fine"); in main.c, one of three things should be true: You compiled without (many) warning messages enabled in your compiler. If so, turn on warning messages in your compiler. The compiler warns you that hello i
TAG : c
Date : November 26 2020, 06:18 AM , By : user3040283
Socket code fails when compiled with -O flag
Socket code fails when compiled with -O flag
wish help you to fix your issue I'm on Ubuntu 16.04 with gcc version 5.4.0. I have a fairly simple sockets example in C that fails when I compile with optimization (-O) (it works with no optimization). I trimmed my original code to: , From man 2 poll
TAG : c
Date : November 26 2020, 06:18 AM , By : user3040212
How to exit safely from a loop while working on a growing input file?
How to exit safely from a loop while working on a growing input file?
may help you . Code is waiting indefinitely for additional data. Code just waits longer and longer with usleep(25000*failedReads).
TAG : c
Date : November 26 2020, 06:18 AM , By : sumit.sipani
the value of sizeof('0') is how much?
the value of sizeof('0') is how much?
wish help you to fix your issue Character literals ('0', 'a', 'd', '.') in C are of type int (unlike in C++, where they are of type char).So you will get in C:
TAG : c
Date : November 26 2020, 06:18 AM , By : Alex777
whats the reason for the xml2-config not found while compiling libxml2?
whats the reason for the xml2-config not found while compiling libxml2?
this one helps. When you write a program that uses a third-party library like libxml, typically you have two problems:
TAG : c
Date : November 25 2020, 12:01 PM , By : Vinicius
Can I use chars as integers in an if statement?
Can I use chars as integers in an if statement?
will be helpful for those in need I'm trying to make program that let the user try to guess the letter that the program choose randomly. The loops and the if statements seem not working. If anybody could check my code a little bit it would be awesome
TAG : c
Date : November 24 2020, 12:01 PM , By : user3038746
How can I check if a struct type has been defined before?
How can I check if a struct type has been defined before?
I hope this helps you . do you mean that you want to separate your program file into one header file that declares the struct you need and one program file that include your program?create a file named "type.h", and in this file
TAG : c
Date : November 24 2020, 12:01 PM , By : user3038669
Longest portable unsigned integer type
Longest portable unsigned integer type
To fix this issue Is it accurate to say that, if you are writing portable C, the longest available unsigned integer type is unsigned long long? I'm not looking for a specific number of bits, or even 'at least a specific number of bits', but 'the long
TAG : c
Date : November 24 2020, 12:01 PM , By : user3038645
what is array decay in c and when it happen?
what is array decay in c and when it happen?
I hope this helps you . From the C Standard (6.3.2.1 Lvalues, arrays, and function designators)
TAG : c
Date : November 24 2020, 12:01 PM , By : user3038636
malloc of a structure in C ( ported from C++ )
malloc of a structure in C ( ported from C++ )
Hope that helps I would like to reserve some memory space on the heap and access it with a pointer. , This
TAG : c
Date : November 24 2020, 12:01 PM , By : PointyStorm
Superfluous (erroneous) message in the Windows message loop of child window when selecting a file
Superfluous (erroneous) message in the Windows message loop of child window when selecting a file
will help you Solved the problem in a simple workaround. After double-clicking, I set the special flag to 1 and drop it to zero at the end of the WM_MOUSEMOVE message. In the message loop, I take into account the movement of the mouse only when the f
TAG : c
Date : November 24 2020, 12:01 PM , By : user3038471
How to read stack trace kernelside in ebpf?
How to read stack trace kernelside in ebpf?
it should still fix some issue It is possible to access the stack traces.The first link you mention (bpf_design_QA) does not refer to the program being traced, it deals with the stack pointer used by the BPF program itself when performing the tracing
TAG : c
Date : November 24 2020, 05:49 AM , By : user3038396
function of void type returning pointers
function of void type returning pointers
I wish this help you Look at c's operator precedence
TAG : c
Date : November 24 2020, 05:48 AM , By : user3038022
block statements, commas, and control expressions in C
block statements, commas, and control expressions in C
With these it helps No. It's not valid under Standard C (C99/C11).It's valid in GNU C, an extension as called statement expressions.
TAG : c
Date : November 23 2020, 12:01 PM , By : Joseph U
Calculate the histogram with OpenMP
Calculate the histogram with OpenMP
it fixes the issue I already went into detail on how to to this here Fill histograms (array reduction) in parallel with OpenMP without using a critical sectionIt's the same as an array reduction. OpenMP does not have built in support for this in C/C+
TAG : c
Date : November 23 2020, 12:01 PM , By : Saurabh Singh
how to use pointer to write a struct to a piece of memory
how to use pointer to write a struct to a piece of memory
Any of those help No, the memory layout will not be like the one drawn above. Consider this line:
TAG : c
Date : November 23 2020, 12:01 PM , By : Skeptical
prep string array for strlen
prep string array for strlen
around this issue I have a string array that is declared like this: , Probably u can set all Pointers to NULL initially
TAG : c
Date : November 22 2020, 11:17 AM , By : A.Kumar
what is significance of bind to zero address
what is significance of bind to zero address
it should still fix some issue Binding to a zero address is the same as binding to INADDR_ANY (which is defined as zero). This means you can make a connection on any local IP address (server side) or use the egress interface IP address (client side).
TAG : c
Date : November 22 2020, 11:17 AM , By : Trịnh Thị Mai
Does my system support monotonic clock?
Does my system support monotonic clock?
To fix the issue you can do [The manual page for clock_gettime() says it pretty clearly:
TAG : c
Date : November 22 2020, 11:12 AM , By : Poul
Determining if a packet if type IPv4 or IPv6
Determining if a packet if type IPv4 or IPv6
it fixes the issue The IP version field is the bottom 4 bits of the first byte. As this is in a byte (rather than a multibyte) field, the endianness of the machine should be irrelevant. You will need it, however, for multibyte structures.
TAG : c
Date : November 22 2020, 11:12 AM , By : Addai
printf statement in color
printf statement in color
hope this fix your issue The statement pcs+pcs adds two pointers. The result is a pointer that points somewhere completely unrelated which will almost certainly crash your program. The right way to do what you want is to either change the format stri
TAG : c
Date : November 22 2020, 11:12 AM , By : Pre Fabric
Where are "_Jv_RegisterClasses" and "clock_gettime" defined on 32 bit Linux?
Where are "_Jv_RegisterClasses" and "clock_gettime" defined on 32 bit Linux?
hop of those help? The default linker used by GCC needs to have libraries after the object files needing them.So try instead e.g.
TAG : c
Date : November 22 2020, 11:02 AM , By : javascriptlover
For an Integer Array |a| and Integer |i| in C, a[i] gives the same result as i[a]
For an Integer Array |a| and Integer |i| in C, a[i] gives the same result as i[a]
With these it helps From C-FAQ:Q: I came across some joke code containing the expression 5["abcdef"] . How can this be legal C?
TAG : c
Date : November 22 2020, 11:02 AM , By : koanka
C Reading in integers from txt without fscanf
C Reading in integers from txt without fscanf
like below fixes the issue You can also read an integer from the file without using fscanf. Here is some code which reads content from the file, without using fscanf. I also corrected some data type declaration for your value in which you compared in
TAG : c
Date : November 22 2020, 11:02 AM , By : Alex Felton
how does load command file in unix gets parameter?
how does load command file in unix gets parameter?
I wish this help you I'm trying to understand this in details. say, I want to create a new command that does something with a file. , first the glw should have what extension?
TAG : c
Date : November 22 2020, 11:02 AM , By : haiba3300
Is it possible to use fopen to read a file with a relative path in C on OS X?
Is it possible to use fopen to read a file with a relative path in C on OS X?
Hope this helps I'm trying to do something like that in my API: , I found a solution. My project folder is something like this:
TAG : c
Date : November 22 2020, 10:58 AM , By : Joshua Smart
OpenGL ES 2.0: Object flattens as it rotates
OpenGL ES 2.0: Object flattens as it rotates
may help you . So I figured out my issue finally... I had written the matrix multiplication function myself. Problem is I was assigning multiplication to one of the original matrices resulting in warped results down the rows.
TAG : c
Date : November 22 2020, 10:58 AM , By : Aabid Umer
Passing float as argument screws up value
Passing float as argument screws up value
will help you The va_arg macro's second argument is the actual type of the actual argument. No conversion takes place as a result of the va_arg invocation. If you don't know the actual type of the actual argument, you're out of luck because there is
TAG : c
Date : November 22 2020, 10:58 AM , By : user7453143
inet_pton() gives "Segmentation fault"
inet_pton() gives "Segmentation fault"
I hope this helps you . In my program, I am using the inet_pton function one of two ways: , Two bugs here:
TAG : c
Date : November 22 2020, 10:58 AM , By : Serhios
tracing through bitwise & and ^ in C
tracing through bitwise & and ^ in C
I wish this help you Everything is correct till the last step x 1 interpretation is wrong.According to your example x = 0110 (after initial computations) and 1 is represented as 0000 0000 0000 0001 (not 1111)
TAG : c
Date : November 22 2020, 10:58 AM , By : CountBigBang
How to prompt the user to enter a integer within a certain amount of numbers
How to prompt the user to enter a integer within a certain amount of numbers
seems to work fine I was trying to figure out what statement to use to get the user to enter a number between 1 and 10.
TAG : c
Date : November 22 2020, 10:58 AM , By : E.Vid
Pointer taking input infinitely
Pointer taking input infinitely
it helps some times You are messing up int and char (format specifier %d is for integers, not characters). Please refer to here for more info of format specifiers for different types.If you want to read integers from user, you need to change your cod
TAG : c
Date : November 22 2020, 10:58 AM , By : Z. Nyilas
Linked list only grabbing last input of File contents
Linked list only grabbing last input of File contents
I hope this helps you . I'm trying to upload a list from a outside FILE into a linked list and have all the chars from the FILE be accessible on the list. I have this so far, but It only contains the last word from my input file list. I don't know wh
TAG : c
Date : November 22 2020, 10:58 AM , By : Siddharth Paul
How to determine if number represented by char array will overflow an int?
How to determine if number represented by char array will overflow an int?
wish help you to fix your issue The strtoul() function will convert to an unsigned long (which must have at least as much range as unsigned int), and allows you to detect out-of-range values. You can further compare the result against UINT_MAX (from
TAG : c
Date : November 22 2020, 10:58 AM , By : ruth quintana
Creating arrays in C
Creating arrays in C
wish helps you You're really on the right track.In your second example, where you use malloc(), the fgets() command would be called like so:
TAG : c
Date : November 22 2020, 10:58 AM , By : L.Lang

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