What is the header file required by memcpy under Linux?
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memcpy refers to the memory copy function used by C and C++ to copy resource memory (the memory region pointed to by src) to target memory (the memory region pointed to by dest).
unistd.h is the header file of unix class system definition symbolic constants defined by POSIX standard, which contains many UNIX system service function prototypes, such as read function, write function and getpid function.
The stdlib. hstdlib header file contains the most commonly used system functions in C and C++ languages.
stdlib.h defines five types, macros, and general utility functions.
Types such as size_t, wchar_t, div_t, ldiv_t, and lldiv_t;
macros such as EXIT_FAILURE, EXIT_SUCCESS, RAND_MAX, MB_CUR_MAX, etc.;
Common functions such as malloc(), calloc(), realloc(), free(), system(), atoi(), atol(), rand(), srand(), exit(), etc.
3.unistd.h
is the header file for POSIX standard defined unix class system definition symbolic constants, containing function prototypes for many UNIX system services, such as read, write, and getpid functions
\4. string.h
Functions such as bzero,bcopy,bcmp,memset,memcpy memcmp are provided.
netdb.h defines network-related structures, variable types, macros, and functions. For example:
struct hostent *gethostbyaddr(const void *addr, size_t len, int type);
struct hostent *gethostbyname(const char *name);
sys/types.h: Data type definition
sys/socket.h: Provides socket functions and data structures
netinet/in.h: defines the data structure sockaddr_in
arpa/inet.h: Provides IP address conversion functions such as inet_pton, inet_ntop
netdb.h: Provides functions to set and obtain domain names
sys/ioctl.h: Functions that provide I/O control
sys/poll.h: Functions that provide socket wait testing mechanisms
fcntl.h: Functions that provide control over files
time.h: Provides a function of time
crypt.h: Provides encryption functions using DES encryption algorithm
pwd.h: Functions that provide access to the/etc/passwd file
shadow.h: Functions that provide access to/etc/shadow files
pthread.h: Functions that provide multithreaded operations
signal.h: Provides a function that operates on the signal
sys/wait.h, sys/ipc.h, sys/shm.h: Functions that provide process waiting, interprocess communication (IPC), and shared memory Suggestion: When writing network programs, you can directly use the following header file code #include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
When it comes to user permissions and password verification, add the following statement: #include
#include
#include
It should be noted that the encryption algorithm library should be linked at compile time, that is, the compilation option should be added:
-lcrypt
Add the following sentence to the file and time operations:
#include
#include
#include
#include
#include
When it comes to multi-process operations, add the following statement:
#include
#include
#include
#include
When it comes to multithreaded operations, add the following statement:
#include
#include Note that you should link the thread library at compile time, that is, add compile options:
-lthread
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