ISO C 标准头文件
Header
FreeBSD 5.2.1
Linux 2.4.22
Mac OS X 10.3
Solaris 9
Description
<assert.h>
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verify program assertion
<complex.h>
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complex arithmetic support
<ctype.h>
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character types
<errno.h>
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<fenv.h>
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floating-point environment
<float.h>
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floating-point constants
<inttypes.h>
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integer type format conversion
<iso646.h>
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alternate relational operator macros（替代关系操作符宏）
<limits.h>
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<locale.h>
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locale categories
<math.h>
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mathematical constants
<setjmp.h>
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<signal.h>
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<stdarg.h>
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variable argument lists
<stdbool.h>
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boolean type and values
<stddef.h>
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standard definitions
<stdint.h>
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integer types
<stdio.h>
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standard I/O library
<stdlib.h>
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utility functions
<string.h>
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string operations
<tgmath.h>
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type-generic math macros
<time.h>
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time and date
<wchar.h>
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extended multibyte and wide character support
<wctype.h>
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wide character classification and mapping support
POSIX 标准定义的必须的头文件
Header
FreeBSD 5.2.1
Linux 2.4.22
Mac OS X 10.3
Solaris 9
Description
<dirent.h>
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directory entries
<fcntl.h>
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file control
<fnmatch.h>
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filename-matching types
<glob.h>
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pathname pattern-matching types
<grp.h>
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group file
<netdb.h>
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network database operations
<pwd.h>
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password file
<regex.h>
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regular expressions
<tar.h>
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tar archive values
<termios.h>
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terminal I/O
<unistd.h>
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symbolic constants（符号常量）
<utime.h>
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file times （文件时间）
<wordexp.h>
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word-expansion types
<arpa/inet.h>
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Internet definitions
<net/if.h>
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socket local interfaces
<netinet/in.h>
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Internet address family
<netinet/tcp.h>
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Transmission Control Protocol definitions
<sys/mman.h>
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memory management declarations
<sys/select.h>
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select function
<sys/socket.h>
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sockets interface
<sys/stat.h>
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file status
<sys/times.h>
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process times（进程时间）
<sys/types.h>
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primitive system data types（基本系统数据类型）
<sys/un.h>
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UNIX domain socket definitions（UNIX域套接字定义）
<sys/utsname.h>
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system name
<sys/wait.h>
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process control
POSIX 标准定义的XSI扩展头文件
Header
FreeBSD 5.2.1
Linux 2.4.22
Mac OS X 10.3
Solaris 9
Description
<cpio.h>
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cpio archive values
<dlfcn.h>
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dynamic linking
<fmtmsg.h>
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message display structures
<ftw.h>
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file tree walking（文件树漫游）
<iconv.h>
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codeset conversion utility
<langinfo.h>
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language information constants
<libgen.h>
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definitions for pattern-matching function
<monetary.h>
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monetary types
<ndbm.h>
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database operations
<nl_types.h>
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message catalogs（消息类别）
<poll.h>
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poll function（轮询函数）
<search.h>
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search tables（搜索表）
<strings.h>
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string operations
<syslog.h>
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system error logging
<ucontext.h>
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user context
<ulimit.h>
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user limits
<utmpx.h>
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user accounting database
<sys/ipc.h>
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IPC
<sys/msg.h>
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message queues
<sys/resource.h>
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resource operations
<sys/sem.h>
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semaphores
<sys/shm.h>
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shared memory
<sys/statvfs.h>
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file system information
<sys/time.h>
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time types
<sys/timeb.h>
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additional date and time definitions
<sys/uio.h>
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vector I/O operations（矢量I/O操作）
POSIX 标准定义的可选头文件
Header
FreeBSD 5.2.1
Linux 2.4.22
Mac OS X 10.3
Solaris 9
Description
<aio.h>
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asynchronous I/O
<mqueue.h>
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message queues
<pthread.h>
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threads
<sched.h>
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execution scheduling
<semaphore.h>
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semaphores
<spawn.h>
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real-time spawn interface
<stropts.h>
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XSI STREAMS interface
<trace.h>
event tracing
POSIX.1 可选接口组和代码
Code
SUS mandatory
Symbolic constant
Description
ADV
_POSIX_ADVISORY_INFO
advisory information (real-time)
AIO
_POSIX_ASYNCHRONOUS_IO
asynchronous input and output (real-time)
BAR
_POSIX_BARRIERS
barriers (real-time)
CPT
_POSIX_CPUTIME
process CPU time clocks (real-time)
CS
_POSIX_CLOCK_SELECTION
clock selection (real-time)
CX
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extension to ISO C standard
FSC
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_POSIX_FSYNC
file synchronization
IP6
_POSIX_IPV6
IPv6 interfaces
MF
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_POSIX_MAPPED_FILES
memory-mapped files
ML
_POSIX_MEMLOCK
process memory locking (real-time)
MLR
_POSIX_MEMLOCK_RANGE
memory range locking (real-time)
MON
_POSIX_MONOTONIC_CLOCK
monotonic clock (real-time)
MPR
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_POSIX_MEMORY_PROTECTION
memory protection
MSG
_POSIX_MESSAGE_PASSING
message passing (real-time)
MX
IEC 60559 floating-point option
PIO
_POSIX_PRIORITIZED_IO
prioritized input and output
PS
_POSIX_PRIORITIZED_SCHEDULING
process scheduling (real-time)
RS
_POSIX_RAW_SOCKETS
raw sockets
RTS
_POSIX_REALTIME_SIGNALS
real-time signals extension
SEM
_POSIX_SEMAPHORES
semaphores (real-time)
SHM
_POSIX_SHARED_MEMORY_OBJECTS
shared memory objects (real-time)
SIO
_POSIX_SYNCHRONIZED_IO
synchronized input and output (real-time)
SPI
_POSIX_SPIN_LOCKS
spin locks (real-time)
SPN
_POSIX_SPAWN
spawn (real-time)
SS
_POSIX_SPORADIC_SERVER
process sporadic server (real-time)
TCT
_POSIX_THREAD_CPUTIME
thread CPU time clocks (real-time)
TEF
_POSIX_TRACE_EVENT_FILTER
trace event filter
THR
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_POSIX_THREADS
threads
TMO
_POSIX_TIMEOUTS
timeouts (real-time)
TMR
_POSIX_TIMERS
timers (real-time)
TPI
_POSIX_THREAD_PRIO_INHERIT
thread priority inheritance (real-time)
TPP
_POSIX_THREAD_PRIO_PROTECT
thread priority protection (real-time)
TPS
_POSIX_THREAD_PRIORITY_SCHEDULING
thread execution scheduling (real-time)
TRC
_POSIX_TRACE
trace
TRI
_POSIX_TRACE_INHERIT
trace inherit
TRL
_POSIX_TRACE_LOG
trace log
TSA
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_POSIX_THREAD_ATTR_STACKADDR
thread stack address attribute
TSF
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_POSIX_THREAD_SAFE_FUNCTIONS
thread-safe functions
TSH
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_POSIX_THREAD_PROCESS_SHARED
thread process-shared synchronization
TSP
_POSIX_THREAD_SPORADIC_SERVER
thread sporadic server (real-time)
TSS
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_POSIX_THREAD_ATTR_STACKSIZE
thread stack address size
TYM
_POSIX_TYPED_MEMORY_OBJECTS
typed memory objects (real-time)
XSI
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_XOPEN_UNIX
X/Open extended interfaces
XSR
_XOPEN_STREAMS
XSI STREAMS