file include

fopen (Open file)Correlation function Open,fcloseTable header file #include Defines the function FILE * fopen (const char * path,const char * mode);Function description The path string contains the file path and filename to open, and the parameter

Common Linux C functions-Signal Processing-general Linux technology-Linux programming and kernel information. For more information, see the following section. Alarm) Related functions: signal, sleep Header file # include Define the function

Fileio1.open () system callHeader file#include #include #include Prototypeint open (const char * name,int flags);int open (const char * name,int flags,mode_t mode);Flags o_rdonly o_wronly O_RDWR　　O_append each write operation to the end of the fileO_

1, TCP/IP Protocol Overview 1.1, OSI Reference Model and TCP/IP Reference Model the OSI protocol reference model is developed based on the recommendations of the International Organization for Standardization (ISO), from top to developmet into 7

Reference: http://hi.baidu.com/luxey/blog/item/41c802085918a1980a7b8292.html # Include Unistd. h > # Include Signal. h > Void Handler (){Printf ( " Hello \ n " );}Main (){ Int I;Signal (sigalrm, Handler );Alarm ( 5 );

Close (close the file) Related functions Open, fcntl, shutdown, unlink, fclose Header file # Include Define functions Int close (int fd ); Function Description If the file is no longer needed after

Common Linux C functions-character testing-general Linux technology-Linux programming and kernel information. For more information, see the following section. Isalnum (test whether the character is English or a number) Related functions: isalpha,

Sys/types. h Is the header file of the basic system data type of Unix/Linux systems, including size_t, time_t, pid_t and other types. The application source file contains to access the definition of _ lp64 and _ ilp32. This header file also

1. Write global variables separately (for reference ).Generally, we are used to placing different functional modules in a header file and a C file. For example, write some mathematical functions:[Cpp]// Mymath. h# Ifndef _ mymath_H# Define _

Atof (converts a string to a float number) related functions atoi, atol, strtodd, strtol, strtoul header file # include define the function double atof (const char * nptr); function description atof () scans

String Conversion Functions1) atof converts a string into a floating-point numberCorrelation function Atoi,atol,strtod,strtol,strtoulTable header file #include Defines the function double atof (const char *nptr);The function Description Atof ()

It is often used to convert strings and numbers. It is easy to collect and sort them. Then you can use atof (convert string to float type) atoi (convert string to integer type) atol (convert string to integer type) strtol (convert string to floating

Atof (converts a string to a float number)Related functionsAtoi, atol, strtodd, strtol, strtoulHeader file# Include Define functionsDouble atof (const char * nptr );Function DescriptionAtof () will scan the nptr parameter string, skip the leading

Fcntl. h and unistd. h2008-08-22 22: 15fcntl. h define a lot of macro and open, fcntl function prototypeUnistd. h defines more function prototypes Close (close the file)Header file # include Defines the int close (int fd) function );Function

Conversion functions of strings and numbers in VC) Conversion functions of strings and numbers in VC: atoi, atol, strtodd, strtol, strtoul type conversion Atoi, atol, strtodd, strtol, and strtoul implement type conversion Atof (converts a string to

Atof (convert a string to a float number) atoi (convert a string to an integer number) atol (convert a string to an integer number) Strtol (convert string to floating point number) strtol (convert string to integer) strtoul (convert string to

Http://blog.chinaunix.net/u1/42145/showart_327438.htmlConversion functions of strings and numbers in VC: atoi, atol, strtodd, strtol, strtoul type conversionAtoi, atol, strtodd, strtol, and strtoul implement type conversionAtof (converts a string to

Use the atoi, atol, strtodd, strtol, and strtoul functions to implement type conversion. Atof (converts a string to a float number)Related functionsAtoi, atol, strtodd, strtol, strtoulHeader file# Include Define functionsDouble atof (const char *

Linux network programming notes-general Linux technology-Linux programming and kernel information. The following is a detailed description. There are three types of sockets: 1. Streaming socket (SOCKET_STREAM) Provides reliable connection-oriented

There are three types of sockets:1. Streaming socket (socket_stream)Provides reliable connection-oriented data transmission services. Data is considered as a byte stream with no length restrictions. For example, FTP uses this protocol.2. datagram