- aio.h(0) — asynchronous input and output
- arpa_inet.h(0), arpa/inet.h(0) — definitions for internet operations
- assert.h(0) — verify program assertion
- complex.h(0) — complex arithmetic
- cpio.h(0) — cpio archive values
- ctype.h(0) — character types
- dirent.h(0) — format of directory entries
- dlfcn.h(0) — dynamic linking
- errno.h(0) — system error numbers
- fcntl.h(0) — file control options
- fenv.h(0) — floating-point environment
- float.h(0) — floating types
- fmtmsg.h(0) — message display structures
- fnmatch.h(0) — filename-matching types
- ftw.h(0) — file tree traversal
- glob.h(0) — pathname pattern-matching types
- grp.h(0) — group structure
- iconv.h(0) — codeset conversion facility
- inttypes.h(0) — fixed size integer types
- iso646.h(0) — alternative spellings
- langinfo.h(0) — language information constants
- libgen.h(0) — definitions for pattern matching functions
- limits.h(0) — implementation-defined constants
- locale.h(0) — category macros
- math.h(0) — mathematical declarations
- monetary.h(0) — monetary types
- mqueue.h(0) — message queues (REALTIME)
- ndbm.h(0) — definitions for ndbm database operations
- net_if.h(0), net/if.h(0) — sockets local interfaces
- netdb.h(0) — definitions for network database operations
- netinet_in.h(0), netinet/in.h(0) — Internet address family
- netinet_tcp.h(0), netinet/tcp.h(0) — definitions for the Internet Transmission Control Protocol (TCP)
- nl_types.h(0) — data types
- poll.h(0) — definitions for the poll(|) function
- pthread.h(0) — threads
- pwd.h(0) — password structure
- regex.h(0) — regular expression matching types
- sched.h(0) — execution scheduling
- search.h(0) — search tables
- semaphore.h(0) — semaphores
- setjmp.h(0) — stack environment declarations
- signal.h(0) — signals
- spawn.h(0) — spawn (ADVANCED REALTIME)
- stdarg.h(0) — handle variable argument list
- stdbool.h(0) — boolean type and values
- stddef.h(0) — standard type definitions
- stdint.h(0) — integer types
- stdio.h(0) — standard buffered input/output
- stdlib.h(0) — standard library definitions
- string.h(0) — string operations
- strings.h(0) — string operations
- stropts.h(0) — STREAMS interface (STREAMS)
- sys_ipc.h(0), sys/ipc.h(0) — XSI interprocess communication access structure
- sys_mman.h(0), sys/mman.h(0) — memory management declarations
- sys_msg.h(0), sys/msg.h(0) — XSI message queue structures
- sys_resource.h(0), sys/resource.h(0) — definitions for XSI resource operations
- sys_select.h(0), sys/select.h(0) — select types
- sys_sem.h(0), sys/sem.h(0) — XSI semaphore facility
- sys_shm.h(0), sys/shm.h(0) — XSI shared memory facility
- sys_socket.h(0), sys/socket.h(0) — main sockets header
- sys_stat.h(0), sys/stat.h(0) — data returned by the stat(|) function
- sys_statvfs.h(0), sys/statvfs.h(0) — VFS File System information structure
- sys_time.h(0), sys/time.h(0) — time types
- sys_times.h(0), sys/times.h(0) — file access and modification times structure
- sys_types.h(0), sys/types.h(0) — data types
- sys_uio.h(0), sys/uio.h(0) — definitions for vector I/O operations
- sys_un.h(0), sys/un.h(0) — definitions for UNIX domain sockets
- sys_utsname.h(0), sys/utsname.h(0) — system name structure
- sys_wait.h(0), sys/wait.h(0) — declarations for waiting
- syslog.h(0) — definitions for system error logging
- tar.h(0) — extended tar definitions
- termios.h(0) — define values for termios
- tgmath.h(0) — type-generic macros
- time.h(0) — time types
- trace.h(0) — tracing
- ulimit.h(0) — ulimit commands
- unistd.h(0) — standard symbolic constants and types
- utime.h(0) — access and modification times structure
- utmpx.h(0) — user accounting database definitions
- wchar.h(0) — wide-character handling
- wctype.h(0) — wide-character classification and mapping utilities
- wordexp.h(0) — word-expansion types