Note that the core of the Single Unix Specification, Version 3 is also ISO/IEC 9945:2003 and IEEE Std 1003.1-2001 (POSIX.1-2001). FD_CLR FD_ISSET FD_SET FD_ZERO _Exit _exit _longjmp _setjmp _tolower _toupper a64l abort abs accept access acos acosf acosh acoshf alarm asctime asctime_r asin asinf asinh asinhf atan atan2 atan2f atanf atanh atanhf atexit atof atoff atoi atol atoll basename bcmp bcopy bind bsearch btowc bzero cabs cabsf calloc catclose (available in external "catgets" library) catgets (available in external "catgets" library) catopen (available in external "catgets" library) cbrt cbrtf ceil ceilf cfgetispeed cfgetospeed cfsetispeed cfsetospeed chdir chmod chown chroot (see chapter "Implementation Notes") clearerr clock clock_getres (see chapter "Implementation Notes") clock_gettime (see chapter "Implementation Notes") clock_setres (see chapter "Implementation Notes") close closedir closelog confstr connect copysign copysignf cos cosf cosh coshf creat crypt (available in external "crypt" library) ctermid ctime ctime_r daylight dbm_clearerr (available in external "libgdbm" library) dbm_close (available in external "libgdbm" library) dbm_delete (available in external "libgdbm" library) dbm_error (available in external "libgdbm" library) dbm_fetch (available in external "libgdbm" library) dbm_firstkey (available in external "libgdbm" library) dbm_nextkey (available in external "libgdbm" library) dbm_open (available in external "libgdbm" library) dbm_store (available in external "libgdbm" library) difftime dirname div dlclose dlerror dlopen dlsym drand48 dup dup2 ecvt encrypt (available in external "crypt" library) endgrent endhostent endprotoent endpwent endservent endutxent environ erand48 erf erfc erfcf erff errno execl execle execlp execv execve execvp exit exp exp2 exp2f expf expm1 expm1f fabs fabsf fchdir fchmod fchown fclose fcntl fcvt fdatasync fdim fdimf fdopen feof ferror fflush ffs fgetc fgetpos fgets fileno flockfile floor floorf fma fmaf fmax fmaxf fmin fminf fmod fmodf fnmatch fopen fork fpathconf fprintf fputc fputs fread free freeaddrinfo freopen frexp frexpf fscanf fseek fseeko fsetpos fstat fstatvfs fsync ftell ftello ftime ftok ftruncate ftrylockfile ftw funlockfile futimes fwrite gai_strerror gcvt getaddrinfo getc getc_unlocked getchar getchar_unlocked getcwd getdelim getdomainname getegid getenv geteuid getgid getgrent getgrgid getgrgid_r getgrnam getgrnam_r getgroups gethostbyaddr gethostbyname gethostid gethostname getitimer (see chapter "Implementation Notes") getlogin getlogin_r getnameinfo getopt getpeername getpgid getpgrp getpid getppid getpriority getprotobyname getprotobynumber getprotoent getpwent getpwnam getpwnam_r getpwuid getpwuid_r getrlimit getrusage gets getservbyname getservbyport getservent getsid getsockname getsockopt getsubopt gettimeofday getuid getutxent getutxid getutxline getwd glob globfree gmtime gmtime_r grantpt h_errno hcreate hdestroy hsearch hstrerror htonl htons hypot hypotf iconv (available in external "libiconv" library) iconv_close (available in external "libiconv" library) iconv_open (available in external "libiconv" library) if_freenameindex if_indextoname if_nameindex if_nametoindex ilogb ilogbf imaxabs imaxdiv index inet_addr inet_ntoa inet_ntop inet_pton initstate insque ioctl isalnum isalpha isascii isatty isblank iscntrl isdigit isfinite isgraph isgreater isgreaterequal isinf isless islessequal islessgreater islower isnan isnormal isprint ispunct isspace isunordered isupper iswalnum iswalpha iswblank iswcntrl iswctype iswdigit iswgraph iswlower iswprint iswpunct iswspace iswupper iswxdigit isxdigit j0 j1 jn jrand48 kill killpg l64a labs lchown lcong48 ldexp ldexpf ldiv lfind lgamma lgammaf link listen llabs lldiv localeconv localtime localtime_r log log10 log10f log1p log1pf logb logbf logf longjmp lrand48 lrint lrintf lround lroundf lsearch lseek lstat malloc mblen mbrlen mbrtowc mbsinit mbsrtowcs mbstowcs mbtowc memccpy memchr memcmp memcpy memmove memset mkdir mkfifo mknod mkstemp mktemp mktime mlock mmap modf modff mprotect mq_close mq_getattr mq_notify mq_open mq_receive mq_send mq_setattr mq_timedreceive mq_timedsend mq_unlink mrand48 msgctl (see chapter "Implementation Notes") msgget (see chapter "Implementation Notes") msgrcv (see chapter "Implementation Notes") msgsnd (see chapter "Implementation Notes") msync munlock munmap nan nanf nanosleep nearbyint nearbyintf nextafter nextafterf nftw nice nl_langinfo nrand48 ntohl ntohs open opendir openlog optarg opterr optind optopt pathconf pause pclose perror pipe poll popen posix_fadvise posix_fallocate posix_madvise posix_memalign posix_openpt pow powf pread printf pselect pthread_atfork pthread_attr_destroy pthread_attr_getdetachstate pthread_attr_getinheritsched pthread_attr_getschedparam pthread_attr_getschedpolicy pthread_attr_getscope pthread_attr_getstacksize pthread_attr_init pthread_attr_setdetachstate pthread_attr_setinheritsched pthread_attr_setschedparam pthread_attr_setschedpolicy pthread_attr_setscope pthread_attr_setstacksize pthread_cancel pthread_cond_broadcast pthread_cond_destroy pthread_cond_init pthread_cond_signal pthread_cond_timedwait pthread_cond_wait pthread_condattr_destroy pthread_condattr_getpshared pthread_condattr_init pthread_condattr_setpshared pthread_create pthread_detach pthread_equal pthread_exit pthread_getconcurrency pthread_getschedparam pthread_getspecific pthread_join pthread_key_create pthread_key_delete pthread_kill pthread_mutex_destroy pthread_mutex_getprioceiling pthread_mutex_init pthread_mutex_lock pthread_mutex_setprioceiling pthread_mutex_trylock pthread_mutex_unlock pthread_mutexattr_destroy pthread_mutexattr_getprioceiling pthread_mutexattr_getprotocol pthread_mutexattr_getpshared pthread_mutexattr_gettype pthread_mutexattr_init pthread_mutexattr_setprioceiling pthread_mutexattr_setprotocol pthread_mutexattr_setpshared pthread_mutexattr_settype pthread_once pthread_rwlock_destroy pthread_rwlock_init pthread_rwlock_rdlock pthread_rwlock_tryrdlock pthread_rwlock_trywrlock pthread_rwlock_unlock pthread_rwlock_wrlock pthread_rwlockattr_destroy pthread_rwlockattr_getpshared pthread_rwlockattr_init pthread_rwlockattr_setpshared pthread_self pthread_setcancelstate pthread_setcanceltype pthread_setconcurrency pthread_setschedparam pthread_setspecific pthread_sigmask pthread_testcancel ptsname putc putc_unlocked putchar putchar_unlocked putenv puts pututxline pwrite qsort raise rand rand_r random read readdir readdir_r readlink readv realloc realpath recv recvfrom recvmsg regcomp regerror regexec regfree remainder remainderf remove remque remquo remquof rename rewind rewinddir rindex rint rintf rmdir round roundf scalb scalbln scalblnf scalbn scalbnf scandir scanf sched_get_priority_max sched_get_priority_min sched_getparam sched_getscheduler sched_rr_get_interval sched_setparam sched_setscheduler sched_yield seed48 seekdir select sem_close sem_destroy sem_getvalue sem_init sem_open sem_post sem_timedwait sem_trywait sem_unlink sem_wait semctl (see chapter "Implementation Notes") semget (see chapter "Implementation Notes") semop (see chapter "Implementation Notes") send sendmsg sendto setegid setenv seteuid setgid setgrent sethostent setitimer (see chapter "Implementation Notes") setjmp setkey (available in external "crypt" library) setlocale setlogmask setpgid setpgrp setpriority setprotoent setpwent setregid setreuid setrlimit setservent setsid setsockopt setstate setuid setutxent setvbuf shm_open shm_unlink shmat (see chapter "Implementation Notes") shmctl (see chapter "Implementation Notes") shmdt (see chapter "Implementation Notes") shmget (see chapter "Implementation Notes") shutdown sigaction sigaddset sigdelset sigemptyset sigfillset sighold sigignore siginterrupt sigismember siglongjmp signal signbit signgam sigpause sigpending sigprocmask sigqueue sigrelse sigset sigsetjmp sigsuspend sigwait sigwaitinfo sin sinf sinh sinhf sleep snprintf socket socketpair sprintf sqrt sqrtf srand srand48 srandom sscanf stat statvfs stderr stdin stdout strcasecmp strcat strchr strcmp strcoll strcpy strcspn strdup strerror strerror_r strftime strlen strncasecmp strncat strncmp strncpy strpbrk strptime strrchr strspn strstr strtod strtof strtoimax strtok strtok_r strtol strtoll strtoul strtoull strtoumax strxfrm swab symlink sync sysconf syslog system tan tanf tanh tanhf tcdrain tcflow tcflush tcgetattr tcgetpgrp tcsendbreak tcsetattr tcsetpgrp tdelete telldir tempnam tfind tgamma tgammaf time timer_create timer_delete timer_gettime timer_settime times timezone tmpfile tmpnam toascii tolower toupper towctrans towlower towupper trunc truncate truncf tsearch ttyname ttyname_r twalk tzname tzset ualarm umask uname ungetc unlink unlockpt unsetenv usleep utime utimes va_arg va_end va_start vfork (see chapter "Implementation Notes") vfprintf vfscanf vprintf vscanf vsnprintf vsprintf vsscanf wait waitpid wcrtomb wcscat wcschr wcscmp wcscoll wcscpy wcscspn wcslen wcsncat wcsncmp wcsncpy wcspbrk wcsrchr wcsrtombs wcsspn wcsstr wcstombs wcswidth wctob wctomb wctrans wctype wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset wprintf write writev y0 y1 yn alphasort bindresvport bindresvport_sa daemon dn_comp dn_expand dn_skipname drem endusershell err errx finite finitef fiprintf flock forkpty fstatfs fts_children fts_close fts_get_clientptr fts_get_stream fts_open fts_read fts_set fts_set_clientptr gamma gamma_r gammaf gammaf_r getdtablesize getpagesize getpeereid getprogname getusershell herror inet_aton inet_makeaddr inet_netof inet_network initgroups iruserok iruserok_sa login login_tty logout logwtmp mkdtemp openpty rcmd rcmd_af res_close res_init res_mkquery res_nclose res_ninit res_nmkquery res_nquery res_nquerydomain res_nsearch res_nsend res_query res_querydomain res_search res_send revoke rexec rresvport rresvport_af ruserok sbrk setbuffer setgroups setlinebuf setpassent setprogname settimeofday setusershell statfs strlcat strlcpy strsep strsignal updwtmp valloc verr verrx vhangup (see chapter "Implementation Notes") vsyslog vwarn vwarnx wait3 wait4 warn warnx wcslcat wcslcpy argz_add argz_add_sep argz_append argz_count argz_create argz_create_sep argz_delete argz_extract argz_insert argz_next argz_replace argz_stringify asnprintf asprintf asprintf_r dprintf dremf envz_add envz_entry envz_get envz_merge envz_remove envz_strip fcloseall fcloseall_r getline getopt_long getopt_long_only memmem mempcpy strndup strnlen tdestroy timegm timelocal updwtmpx utmpxname vasnprintf vasprintf vasprintf_r vdprintf acl aclcheck aclfrommode aclfrompbits aclfromtext aclsort acltomode acltopbits acltotext endmntent facl getmntent memalign setmntent cuserid (POSIX.1-1988, SUSv2) endutent (XPG2) getpass (SUSv2) getutent (XPG2) getutid (XPG2) getutline (XPG2) getw (SVID) mallinfo (SVID) mallopt (SVID) on_exit (SunOS) pthread_continue (XPG2) pthread_getsequence_np (Tru64) pthread_suspend (XPG2) pututline (XPG2) putw (SVID) setbuf (C89, C99) setutent (XPG2) sys_errlist (BSD) sys_nerr (BSD) ttyslot (SUSv2) utmpname (XPG2) acoshl acosl aio_cancel aio_error aio_fsync aio_read aio_return aio_suspend aio_write asinhl asinl atan2l atanhl atanl bsd_signal cabsl cacos cacosf cacosh cacoshf cacoshl cacosl carg cargf cargl casin casinf casinh casinhf casinhl casinl catan catanf catanh catanhf catanhl catanl cbrtl ccos ccosf ccosh ccoshf ccoshl ccosl ceill cexp cexpf cexpl cimag cimagf cimagl clock_getcpuclockid clog clogf clogl conj conjf conjl copysignl coshl cosl cpow cpowf cpowl cproj cprojf cprojl creal crealf creall csin csinf csinh csinhf csinhl csinl csqrt csqrtf csqrtl ctan ctanf ctanh ctanhf ctanhl ctanl endnetent erfcl erfl exp2l expl expm1l fabsl fattach fdiml feclearexcept fegetenv fegetexceptflag fegetround feholdexcept feraiseexcept fesetenv fesetexceptflag fesetround fetestexcept feupdateenv fgetwc fgetws floorl fmal fmaxl fminl fmodl fmtmsg fputwc fputws frexpl fwide fwprintf fwscanf getcontext getdate getdate_err gethostent getmsg getnetbyaddr getnetbyname getnetent getpmsg getwc getwchar hypotl ilogbl initstate isastream ldexpl lgammal lio_listio llrint llrintf llrintl llround llroundf llroundl lockf log10l log1pl log2l logbl logl lrintl lroundl makecontext mlockall modfl munlockall nanl nearbyintl nextafterl nexttowardl posix_mem_offset posix_spawn[...] posix_trace[...] posix_typed_[...] powl pthread_attr_getguardsize pthread_attr_getstack pthread_attr_getstackaddr pthread_attr_setguardsize pthread_attr_setstack pthread_attr_setstackaddr pthread_barrier[...] pthread_condattr_getclock pthread_condattr_setclock pthread_getcpuclockid pthread_mutex_timedlock pthread_rwlock_timedrdlock pthread_rwlock_timedwrlock pthread_setschedprio pthread_spin_[...] putmsg reminderl remquol rintl roundl scalblnl scalbnl setcontext setnetent sigaltstack sigtimedwait sinhl sinl sockatmark sqrtl strfmon strtold swabcontext swprintf swscanf tanhl tanl tcgetsid tgammal timer_getoverrun truncl ulimit va_copy vfwprintf vfwscanf vswprintf vswscanf vwprintf vwscanf waitid wcsftime wcstod wcstof wcstoimax wcstok wcstol wcstold wcstoll wcstoul wcstoull wcstoumax wcswcs wcsxfrm wordexp wordfree wscanf chroot only emulates a chroot function call by keeping track of the current root and accomodating this in the file related function calls. A real chroot functionality is not supported by Windows however. clock_getres, clock_gettime and clock_setres only support CLOCK_REALTIME for now. getitimer and setitimer only support ITIMER_REAL for now. link will copy the file if it can't implement a true hardlink. This is true at least for FAT and FAT32 filesystems. NTFS supports hardlinks. lseek only works properly on binary files. setuid is only safe against reverting the user switch after a call to one of the exec(2) functions took place. Windows doesn't support a non-revertable user switch within the context of Win32 processes. vfork just calls fork. vhangup always returns -1 and sets errno to ENOSYS. The XSI IPC functions semctl, semget, semop, shmat, shmctl, shmdt, shmget, msgctl, msgget, msgrcv and msgsnd are only available when cygserver is running and the CYGWIN environment variable is set so that it contains the string server.