In the non-blocking state of the recv function, no data is returned with a value of 0. If the client shuts down, the return value is also 0. How can the two states be distinguished? ...
In the nginx server, after hearing an event in the socket, put the file descriptor in the queue and parse it. how to implement async in this process? where does the nginx server reflect async? there is a question I can t figure out all the time. Are ...
-sharpinclude <stdio.h> int main() { short int x = -10; - 1000 0000 0000 1010 - 1111 1111 1111 0101 - 1111 1111 1111 0110 F F F 6 - fffffff6, 4 printf("%x n", x); } I just ...
< H1 > as the title < H1 > recently, when I was getting started learning ffmpeg, and watching ffplay.c, I had some doubts about the serial variable. I don t know if any of the bosses stepped on the pit first. < H2 > Code < H2 > ffplay-3.4.2 sour...
refer to Exceptions in C with Longjmp and Setjmp to write the following program: -sharpinclude <setjmp.h> -sharpinclude <signal.h> -sharpinclude <stdio.h> jmp_buf ex_buf__; -sharpdefine TRY do{ if(!setjmp(ex_buf__)) { -sharpdefine...
< H1 > Code < H1 > -sharpinclude <stdio.h> struct test{ int i; short c; char *p; }; int main(void) { struct test *pt = NULL; printf("%p n", &(pt->i)); printf("%p n", &(pt->c)); prin...
at the user level, it is easy to send packets using functions such as socket sendto. in the kernel layer, if you use skb to send packets, it always feels like writing from the underlying wheel. within the BSD kernel, you should be able to send simple...
printf("data = %d n",head->next->data); printf("data = %d n",head->data); printf("data = %d n",head->next->data); There is nothing in the middle of the continuous printf, on the main function, but th...
isn t it web server (nginx,Apache) to handle request headers and request lines? Why does psr-7 define several interfaces that handle request headers and request lines? in which scenarios will php receive the original http message directly for proce...
A simple example is as follows: int a = 1 int* p = &a ... ... int c = *p Only the address information is retained in the pointer, so when the program sees * p on the last line, it can know that "take an int from this place ", then there must be...
1. Use ring buffers to exchange data, threadWrite-> buf-> threadRead threadWrite { memcpy(buf[pushCount & mask], value, size); pushCountPP; ... } threadRead { ... } if mask = = 2, pushCount accumulates from 0 when pushCount = 0 pushCount & ma...
work needs to read make recently there is an example in the official GNU make document that I don t quite understand, and some friends who understand it want to give an answer. is as follows: Makefile: objects = main.o kbd.o command.o display.o ...
client is written in C by yourself -sharpdefine BUFFER_SIZE 1024 char recv_buffer[BUFFER_SIZE]; char send_buffer[BUFFER_SIZE]; ... else if (start_with(cmd_read, "cd")) { char *token; const char delim[2] = " t"; to...
-sharpinclude<stdio.h> -sharpinclude<stdlib.h> -sharpinclude<time.h> typedef struct node{ int num; struct node *next; } Node; Node* merge(Node *a,Node *b) { Node *l1=a,*l2=b; Node *tmp=NULL; Node *temp=NU...
is currently getting started learning about FFmpeg. When introducing SDL threads, there are the following problems: 1. Create demux_ thread in main thread 2. demux_thread 3. main 4. Complete code ffplay.c -sharpinclude <stdio.h> -sha...
< H1 > question < H1 > I want to compile it with make. The header file uses iconv.h , but cygwin already has libiconv installed . ...
-sharpinclude<stdio.h> -sharpinclude<stdlib.h> -sharpinclude<time.h> -sharpdefine V_NUM 10 10 typedef struct node { int num; int index; struct node *next; } Node; typedef struct { Node **v_a...
excuse me: linuxnginx 1. 2. 3.swoole nginx ...
Can C declare dynamic arrays? As far as I know, it doesn t work. You must specify size . For example, the following will report an error . string name[]; then the parameters of, command line implement the declaration of dynamic array in the following ...
how to get the IAccessible interface pointer of a QQ chat window from one level to the next? IAccessible ! I wonder why I don t have the child window I want to do. I really appreciate it. ...
the error in the console is as follows. I really don t know why. 2018-11-22 16:13:06,573 ERROR [500.jsp] - Handler dispatch failed; nested exception is java.lang.NoSuchMethodError: com.pt.common.utils.excel.ExportExcel: method <init>()V not foun...
problem description does Github pages use name-based virtual hosts technology? how is it implemented when multiple users use multiple domain names under the same ip such as github pages? the environmental background of the problems and what methods...
I want to calculate how many NULL there are in each column of the table. But I don t want to write as: SELECT SUM(CASE WHEN columns1 IS NULL THEN 0 ELSE 1), SUM(CASE WHEN columns2 IS NULL THEN 0 ELSE 1), SUM(CASE WHEN columns3 IS NULL TH...
I want to set a navigation bar, then link to each section, and then when you slide down the page to that section, the corresponding navigation will change color. The effect is as follows .] then I found out that during the internship, the css wa...
if a table looks like the figure above, the subtotal is calculated by yourself. Title 1, title 2 can be sorted by clicking, but the sorting should be kept subtotal, and the total position remains the same I have tried several methods tableData pus...