Linux header file Function

POSIX standard-defined header files
<Dirent. h> directory item
<Fcntl. h> file control
<Fnmatch. h> file name matching type
<Glob. h> path name pattern matching type
<GRP. h> group file
<Netdb. h> Network Database Operations
<PWD. h> Password File
<RegEx. h> Regular Expression
<Tar. h> tar archive Value
<Termios. h> terminal I/O
<Unistd. h> symbolic constant
<Utime. h> file time
<Wordexp. h> character extension type
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<ARPA/inet. h> Internet Definition
<Net/If. h> Local socket interface
<Netinet/in. h> Internet address family
<Netinet/tcp. h> Transmission Control Protocol definition
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<Sys/Mman. h> memory management statement
<Sys/select. h> select function
<Sys/socket. h> socket excuse
<Sys/STAT. h> File status
<Sys/times. h> process time
<Sys/types. h> Basic System Data Type
<Sys/UN. h> Unix domain socket Definition
<Sys/utsname. h> system name
<Sys/Wait. H> Process Control

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POSIX-defined xsi extension header file
<Cpio. h> cpio archive Value
<Dlfcn. h> Dynamic Link
<Fmtmsg. h> Message Display Structure
FTW. h> file tree roaming
<Iconv. h> Code Set Conversion Program
<Langinfo. h> constant of Language Information
<Libgen. h> pattern matching Function Definition
<Monetary. h> currency type
<Ndbm. h> database operations
<Nl_types.h> message category
<Poll. h> round robin Function
<Search. h> Search tables
<Strings. h> string operation
<Syslog. h> system error logging
<Ucontext. h> User Context
<Ulimit. h> User restrictions
<Utmpx. h> User Account Database
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<Sys/IPC. h> IPC (Named Pipe)
<Sys/msg. h> Message Queue
<Sys/resource. h> Resource Operations
<Sys/SEM. h> semaphores
<Sys/SHM. h> shared storage
<Sys/statvfs. h> File System Information
<Sys/time. h> time type
<Sys/timeb. h> additional date and time definitions
<Sys/uio. h> vector I/O operations

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POSIX-defined optional Header files
<AIO. h> asynchronous I/O
<Mqueue. h> Message Queue
<Pthread. h> thread
<Sched. h> execute Scheduling
<Semaphore. h> semaphores
<Spawn. h> real-time spawn Interface
<Stropts. h> xsi streams Interface
<Trace. h> event tracking