printf

To introduce the function first, we will use three functions, Fopen,fread,fwrite. The order of binary reads and writes is to open the read-write file in binary mode with fopen, and then use the fread and fwrite two functions to write the data to the

Semaphore---Inter-thread communication/"producer Consumer" issue #include #include #include #include & lt;semaphore.h> #include #define MSLEEP (x) usleep (x*1000) #define Product_speed 3 Production speed #define CONSUM_SPEED

FILE_SERVER.C File transfer Order Server sample //File_ SERVER.C File transfer Order Server sample//////////////////////////////////////////////////////////////////////////////////////This file is the code for the server#include //For

When writing a C-language application, to get or print some time-related information, we often use some time functions that come with the C language, such as times, LocalTime, CTime, Mktime, and Asctime. But you may not notice that there are some

//threadpool.h #ifndef __threadpool_h__ #define __THREADPOOL_H__ #include typedef void* (*task_fun) (void*); Use linked list to maintain wait task typedef struct THREADTASK {//Task execution function Task_fun tasks; Executes the

When a longer integer is converted to a shorter integer or char type, the excess high portion is discarded. Program One: #include int main () { int i; char c; i=65535; c=48; I=c; c=i;

Graph (graph) is a more complex data structure with linear table and data elements in linear table, only a direct precursor and a direct successor, in the tree structure, the data elements have a clear hierarchical relationship, and the data

/* A C language design template of the main parametric program, you can automatically sort the parameters into the structure by simply inputting the properties and contents of each parameter in the initialization of the structure. Command execution

8. Setjmp.h The header file setjmp is used to control the underlying calls and function jumps. Macro: SETJMP (); Function: LONGJMP (); Variable: typedef JMP_BUF 8.1. Variables and definitions A variable jmp_buf is an array type that stores

1. __attribute__ One of the major features of GNU C (which is not known to beginners) is the __attribute__ mechanism. __ATTRIBUTE__ can set function attributes, variable attributes (Variable attribute), and type attributes There are two

Implementing Code Instances Program code: #include #include #include /***** cplusplus *****/ #if 0 #include using namespace std; #endif//Get a byte or Word #define MEM_B (x) (* (Byte) (x)) #define MEM_W (x) (* (Word *) (x))//Get The

Message Queuing is a series of sequential messages that are stored in the kernel and accessed through the reference identifier of the message queue. Message Queuing is similar to pipelines, but the advantage of using Message Queuing is that a

Shared memory is the lowest communication mechanism and the fastest communication mechanism in LUnix system. Shared memory uses two or more processes to share the same block of memory to achieve interprocess communication. Typically, a process

The terminal processing of Linux systems is a very large system that needs to deal with many different types of devices and requirements. The content includes: modem, terminal emulation, pseudo terminal and so on. The way the Linux system handles

Client: #include #include #include #include #include #define SERVER_PORT 20000//define the Defualt con Nect Port ID #define CLIENT_PORT ((20001+rand ())%65536)//define the Defualt CLIENT port as a random port #define BUFFER_SIZE 255 #

Setitimer: Similar to alarm, but can be more precise control of the process. Which represents the timing method. Value and oldvalue are pointers to Itmerval. The Setitimer () call successfully returns 0, otherwise it returns-1. Which value: Itimer_

The key to sending a signal is to let the system know which process to send the signal and what signal to send. It should be noted that the ability to send a particular signal to a process is closely related to the user's permissions. For example,

int sigsuspend (const sigset_t *sigmask); This function is used to suspend the process, and sigmask points to a set of signals. When this function is invoked, the signal in the signal set that the Sigmask points to is assigned to the signal mask.

1, sometimes do not want to receive the signal immediately stop the current execution, to deal with the signal, but also do not want to ignore the signal, but delay a period of time to call the signal processing function. This situation is achieved

To process a signal, you need to give the handler function that the system calls when this signal occurs. The corresponding handler function can be registered for a particular signal (excluding Sigkill and sigstop signals). After registering a