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### Headers

- aio.h - asynchronous input and output (REALTIME)
- arpa/inet.h - definitions for internet operations
- assert.h - verify program assertion
- complex.h - complex arithmetic
- cpio.h - cpio archive values
- ctype.h - character types
- dirent.h - format of directory entries
- dlfcn.h - dynamic linking
- errno.h - system error numbers
- fcntl.h - file control options
- fenv.h - floating-point environment
- float.h - floating types
- fmtmsg.h - message display structures
- fnmatch.h - filename-matching types
- ftw.h - file tree traversal
- glob.h - pathname pattern-matching types
- grp.h - group structure
- iconv.h - codeset conversion facility
- inttypes.h - fixed size integer types
- iso646.h - alternative spellings
- langinfo.h - language information constants
- libgen.h - definitions for pattern matching functions
- limits.h - implementation-defined constants
- locale.h - category macros
- math.h - mathematical declarations
- monetary.h - monetary types
- mqueue.h - message queues (REALTIME)
- ndbm.h - definitions for ndbm database operations
- netdb.h - definitions for network database operations
- net/if.h - sockets local interfaces
- netinet/in.h - Internet address family
- netinet/tcp.h - definitions for the Internet Transmission Control Protocol (TCP)
- nl_types.h - data types
- poll.h - definitions for the poll() function
- pthread.h - threads
- pwd.h - password structure
- regex.h - regular expression matching types
- sched.h - execution scheduling (REALTIME)
- search.h - search tables
- semaphore.h - semaphores (REALTIME)
- setjmp.h - stack environment declarations
- signal.h - signals
- spawn.h - spawn (ADVANCED REALTIME)
- stdarg.h - handle variable argument list
- stdbool.h - boolean type and values
- stddef.h - standard type definitions
- stdint.h - integer types
- stdio.h - standard buffered input/output
- stdlib.h - standard library definitions
- string.h - string operations
- strings.h - string operations
- stropts.h - STREAMS interface (STREAMS)
- sys/ipc.h - XSI interprocess communication access structure
- syslog - definitions for system error logging
- sys/mman.h - memory management declarations
- sys/msg.h - XSI message queue structures
- sys/resource.h - definitions for XSI resource operations
- sys/select.h - select types
- sys/sem.h - XSI semaphore facility
- sys/shm.h - XSI shared memory facility
- sys/socket.h - main sockets header
- sys/stat.h - data returned by the stat() function
- sys/statvfs.h - VFS File System information structure
- sys/timeb.h - additional definitions for date and time
- sys/time.h - time types
- sys/times.h - file access and modification times structure
- sys/types.h - data types
- sys/uio.h - definitions for vector I/O operations
- sys/un.h - definitions for UNIX domain sockets
- sys/utsname.h - system name structure
- sys/wait.h - declarations for waiting
- tar.h - extended tar definitions
- termios.h - define values for termios
- tgmath.h - type-generic macros
- time.h - time types
- trace.h - tracing
- ucontext.h - user context
- ulimit.h - ulimit commands
- unistd.h - standard symbolic constants and types
- utime.h - access and modification times structure
- utmpx.h - user accounting database definitions
- wchar.h - wide-character handling
- wctype.h - wide-character classification and mapping utilities
- wordexp.h - word-expansion types

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