Hi, I just wanted to know how to use C to automatically assign a free port (and see what was used) if a specific port number is not provided. For example, i'm using this: struct sockaddr_in address; address->sin_family = AF_INET; address->sin_addr.s_addr = INADDR_ANY; address->sin_port = htons( port ); But how can I replace the sin_p...
When an assert() call fails, what is the exit code used, and where is it documented? ...
hi , I have seen some performance figures are represented by MCPS unit, especially in some dsp codec performance. Can anybody clarify me this? /kanu__ ...
if(pid == 0) { execvp(cmd, args); // printf("hello"); // apparently, putting this or not does not work. _exit(-1); } else { // parent process work } "execvp()" replaces the current program with the to-be-execed program (of course in the same process context). So, putting, say, any printf() calls after execvp() ...
So I just wanted to get some opinions on the overall structure of a game I have to build for a programming class. Essentially - I'm building two programs - a client and a server for a battleships game. I've already written the actual program which plays the battleships game. The program I've written is where a map and rules file is read...
Hi, I am using *open_memstream* in a library of mine, but I would like to port this library to MSVC. It seems there are no equivalent function available, but is there something similar enough? What *open_memstream* does is it takes a char** destination and size and returns a FILE* which you many write to, the data is stored in a dynamic...
How to get the UTC time in milliseconds under windows platform. I am using Standard library which give me UTC time in seconds, I want to get time in miliseconds, kindly give me the reference of any other library which give me the accurate UTC time in miliseconds. ...
When I used valgrind to help debug an app I was working on I notice a huge about of noise which seems to be complaining about standard libraries. As a test I did this; echo 'int main() {return 0;}' | gcc -x c -o test - Then I did this; valgrind ./test ==1096== Use of uninitialised value of size 8 ==1096== at 0x400A202: _dl_new_o...
I'm trying to make a function in C to add numbers to an ordered linked list, but I've got the feeling it can be done in a lot less rows. Is there an example? This example code does not work: #include <stdio.h> #include <stdlib.h> struct listNode { int number; struct listNode *nextPtr; }; typedef struct listNode LISTNODE; type...
copy string between comma input (aaa),(ddD),(sss),(ppp) p=malloc(sizeof(char)*200); gets(p); i want hold input p[0]="(aaa)" p[1]="(ddD)" p[2]="(sss)" p[3]="(ppp)" ...
I don't know how to write applications in C, but I need a tiny program that does: lh = gethostbyname("localhost"); output = lh->h_name; output variable is to be printed. The above code is used in PHP MongoDB database driver to get the hostname of the computer (hostname is part of an input to generate an unique ID). I'm skeptical that...
If I fork a child process, and the child process exits before the parent calls waitpid, then is the exit status information that is set by waitpid still valid? If so, when does it become not valid; i.e., how do I ensure that I can call waitpid on the child pid and continue to get valid exit status information after an arbitrary amount o...
I'm an extension noob. What I want to do is create an extension that doesn't require other libraries to be installed. Is this impossible because the extension has to link against a specific version of libpython at runtime? ...
I'm trying to create a function pointer that takes a function pointer as an argument, but am not sure how to go about it... I was advised to try typedef-ing one of my function pointers, but get the same error. Could someone help me with the correct syntax? int 186 main(int argc, char **argv) 187 { 188 int i; 194 typ...
Question: How do I get the index of the current Object in an NSEnumerator iteration? (I don't want to keep track of things using an integer counter or use a for loop due to speed reasons. I did it before I just cannot remember how I did it...) ...
I have the following code that I'm reading through: if( (i%2) == 0 ){ *d = ((b & 0x0F) << 4); } else{ *d++ |= (b & 0x0F); }; I'm looking specifically at the else statement and wondering in what order this occurs? I don't have a regular C compiler, so I can't test this. When we are performing *d++ |= (b & 0x0F);, what orde...
Hello, I have these a file in a c program which consist of a string and 4 doubles and 2 integer in one line and there is a total of 28 lines, i want to read this file and load the data into an array. can someone help me solve this. ...
pow doesn't accept the second parameter to be a variable on gcc The following code works fine on VC++10 // file test.cc #include "stdafx.h" #include <stdio.h> #include <math.h> int main(void) { double x = 10; int y = 20; printf("%f\n", pow(x, y)); return 0; } But the following code doesn't not work on gcc: // tes...
For this code: int i=0; char **mainp; for(i=0;i<2;++i) { mainp[i]=malloc(sizeof(char)*200); if(!scanf("%[^#],#",mainp[i])) break; if(i<2) scanf("%[^#],#",mainp[i]); } GCC emits the warnings: warning: implicit declaration of function ‘scanf’ warning: incompatible implicit declaration of built-in function ‘sca...
I'm currently trying to retrieve reachable neighbors from the arp table in a user space program written in c. I've looked through the source code to the "ip neigh" command (ipneigh.c) and it appears that I should use the flag NUD_REACHABLE to get the reachable nodes. However, when I look at the data returned from the kernel, I only hav...