What Unix API calls are supported by Cygwin?

This is the beginning of documentation listing the calls supported by the Cygwin library.

All POSIX.1/1996 and ANSI C calls are listed in this file. Note that while almost all POSIX.1/1990 calls are included in Cygwin, most POSIX.1/1996 calls are not (yet at least!). Additional Unix compatibility calls and extended libc/libm calls are provided by Cygwin but may or may not be listed yet.

To see if a function is implemented but not listed here, check for the presence of the call in the file winsup/cygwin.din in the sources. In addition, you may want to read the source code corresponding to the call to verify that it is not a stub. Finally, libc/libm functions (including extended calls not listed here) may be documented in the newlib texinfo documentation.

Calls are implemented on both Windows 95 and NT unless otherwise noted. Included are references to relevant standards, if any. Calls starting with "cygwin_" are Cygwin-specific calls.

ANSI C Library Functions

(Please note: This section has not yet been updated for the latest net release.)

• libc stdio (newlib/libc/stdio)
  • clearerr: C 4.9.10.1
  • fclose: C 4.9.5.1, P 8.2.3.2
  • feof: C 4.9.10.2
  • ferror: C 4.9.10.3
  • fflush: C 4.9.5.2, P 8.2.3.4
  • fgetc: C 4.9.7.1, P 8.2.3.5
  • fgetpos: C 4.9.9.1
  • fgets: C 4.9.7.2, P 8.2.3.5
  • fopen: C 4.9.5.3, P 8.2.3.1
  • fprintf: C 4.9.7.3, P 8.2.3.6
  • fputc: C 4.9.7.3, P 8.2.3.6
  • fputs: C 4.9.7.4, P 8.2.3.6
  • fread: C 4.9.8.1, P 8.2.3.5
  • freopen: C 4.9.5.4, P 8.2.3.3
  • fscanf: C 4.9.6.2, P 8.2.3.7
  • fseek: C 4.9.9.2, P 8.2.3.7
  • fsetpos: C 4.9.9.3
  • ftell: C 4.9.9.4, P 8.2.3.10
  • fwrite: C 4.9.8.2, P 8.2.3.6
  • getc: C 4.9.7.5, P 8.2.3.5
  • getchar: C 4.9.7.6, P 8.2.3.5
  • gets: C 4.9.7.7, P 8.2.3.5
  • perror: C 4.9.10.4, P 8.2.3.8
  • printf: C 4.9.6.3, P 8.2.3.6
  • putc: C 4.9.7.8, P 8.2.3.6
  • putchar: C 4.9.7.9, P 8.2.3.6
  • puts: C 4.9.7.10, P 8.2.3.6
  • remove: C 4.9.4.1, P 8.2.4
  • rename: C 4.9.4.2, P 5.5.3.1
  • rewind: C 4.9.9.5, P 8.2.3.7
  • scanf: C 4.9.6.4, P 8.2.3.5
  • setbuf: C 4.9.5.5
  • setvbuf: C 4.9.5.6
  • sprintf: C 4.9.6.5
  • sscanf: C 4.9.6.6
  • tmpfile: C 4.9.4.3, P 8.2.3.9
  • tmpnam: C 4.9.4.4, P 8.2.5
  • vfprintf: C 4.9.6.7
  • ungetc: C 4.9.7.11
  • vprintf: C 4.9.6.8
  • vsprintf: C 4.9.6.9
• libc string (newlib/libc/string)
  • memchr: C 4.11.5.1
  • memcmp: C 4.11.4.1
  • memcpy: C 4.11.2.1
  • memmove: C 4.11.2.2
  • memset: C 4.11.6.1
  • strcat: C 4.11.3.1
  • strchr: C 4.11.5.2
  • strcmp: C 4.11.4.2
  • strcoll: C 4.11.4.3
  • strcpy: C 4.11.2.3
  • strcspn: C 4.11.5.3
  • strerror: C 4.11.6.2
  • strlen: C 4.11.6.3
  • strncat: C 4.11.3.2
  • strncmp: C 4.11.3.2
  • strncpy: C 4.11.2.4
  • strpbrk: C 4.11.5.4
  • strrchr: C 4.11.5.5
  • strspn: C 4.11.5.6
  • strstr: C 4.11.5.7
  • strtok: C 4.11.5.8
  • strxfrm: C 4.11.4.5
• libc stdlib (newlib/libc/stdlib, environ.cc, newlib/libc/include/machine/setjmp.h newlib/libc/include/assert.h)
  • abort: C 4.10.4.1, P 8.2.3.12
  • abs: C 4.10.6.1
  • assert: C 4.2.1.1
  • atexit: C 4.10.4.2
  • atof: C 4.10.1.1
  • atoi: C 4.10.1.2
  • atol: C 4.10.1.3
  • bsearch: C 4.10.5.1
  • calloc: C 4.10.3.1
  • div: C 4.10.6.2
  • exit: C 4.10.4.3, P 8.2.3.12
  • free: C 4.10.3.2
  • getenv: C 4.10.4.4, P 4.6.1.1
  • labs: C 4.10.6.3
  • ldiv: C 4.10.6.2
  • longjmp: C 4.6.2.1
  • malloc: C 4.10.3.3
  • mblen: C 4.10.7.1
  • mbstowcs: C 4.10.8.1
  • mbtowc: C 4.10.7.2
  • qsort: 4.10.5.2
  • rand: C 4.10.2.1
  • realloc: C 4.10.3.4
  • setjmp: C 4.6.1.1
  • srand: C 4.10.2.2
  • strtod: C 4.10.1.4
  • strtol: C 4.10.1.5
  • strtoul: C 4.10.1.6
  • system: C 4.10.4.5
  • wcstombs: C 4.10.8.2
  • wctomb: C 4.10.7.3
• libc time (times.cc, newlib/libc/time)
  • asctime: C 4.12.3.1
  • gmtime: C 4.12.3.3
  • localtime: C 4.12.3.4, P 8.1.1
  • time: C 4.12.2.4, P 4.5.1.1
  • clock: C 4.12.2.1
  • ctime: C 4.12.3.2
  • difftime: C 4.12.2.2
  • mktime: C 4.12.2.3, P 8.1.1
  • strftime: C 4.11.6.2
• libc signals (signal.cc, newlib/libc/signal)
  • raise: C 4.7.2.1
  • signal: C 4.7.1.1
• libc ctype (newlib/libc/ctype)
  • isalnum: C 4.3.1.1
  • isalpha: C 4.3.1.2
  • iscntrl: C 4.3.1.3
  • isdigit: C 4.3.1.4
  • isgraph: C 4.3.1.5
  • islower: C 4.3.1.6
  • isprint: C 4.3.1.7
  • ispunct: C 4.3.1.8
  • isspace: C 4.3.1.9
  • isupper: C 4.3.1.10
  • isxdigit: C 4.3.1.11
  • tolower: C 4.3.2.1
  • toupper: C 4.3.2.2
• libm math (newlib/libm/math)
  • acos: C 4.5.2.1
  • asin: C 4.5.2.2
  • atan: C 4.5.2.3
  • atan2: C 4.5.2.4
  • ceil: C 4.5.6.1
  • cos: C 4.5.2.5
  • cosh: C 4.5.3.2
  • exp: C 4.5.4.1
  • fabs: C 4.5.6.2
  • floor: C 4.5.6.3
  • fmod: C 4.5.6.4
  • frexp: C 4.5.4.2
  • ldexp: C 4.5.4.3
  • log: C 4.5.4.4
  • log10: C 4.5.4.5
  • modf: C 4.5.4.6
  • pow: C 4.5.5.1
  • sin: C 4.5.2.6
  • sinh: C 4.5.3.2
  • sqrt: C 4.5.5.2
  • tan: C 4.5.2.7
  • tanh: C 4.5.3.3
• libc misc (newlib/libc/locale, gcc/ginclude/stdarg.h)
  • localeconv: C 4.4.2.1
  • setlocale: C 4.4.1.1, P 8.1.2.1
  • va_arg: C 4.8.1.2
  • va_end: C 4.8.1.3
  • va_start: C 4.8.1.1

  POSIX.1/96 Functions

  (Please note: This section has not yet been updated for the latest net release.)

• Process Primitives (Section 3)
  • fork: P 3.1.1.1
  • execl: P 3.1.2.1
  • execle: P 3.1.2.1
  • execlp: P 3.1.2.1
  • execv: P 3.1.2.1
  • execve: P 3.1.2.1
  • execvp: P 3.1.2.1
  • pthread_atfork: P96 3.1.3.1 -- unimplemented
  • wait: P 3.2.1.1
  • waitpid: P 3.2.1.1
  • _exit: P 3.2.2.1
  • kill: P 3.3.2.1
  • sigemptyset: P 3.3.3.1
  • sigfillset: P 3.3.3.1
  • sigaddset: P 3.3.3.1
  • sigdelset: P 3.3.3.1
  • sigismember: P 3.3.3.1
  • sigaction: P 3.3.4.1
  • pthread_sigmask: P96 3.3.5.1
  • sigprocmask: P 3.3.5.1
  • sigpending: P 3.3.6.1
  • sigsuspend: P 3.3.7.1
  • sigwait: P96 3.3.8.1 -- unimplemented
  • sigwaitinfo: P96 3.3.8.1 -- unimplemented
  • sigtimedwait: P96 3.3.8.1 -- unimplemented
  • sigqueue: P96 3.3.9.1 -- unimplemented
  • pthread_kill: P96 3.3.10.1
  • alarm: P 3.4.1.1
  • pause: P 3.4.2.1
  • sleep: P 3.4.3.1
• Process Environment (Section 4)
  • getpid: P 4.1.1.1
  • getppid: P 4.1.1.1
  • getuid: P 4.2.1.1
  • geteuid: P 4.2.1.1
  • getgid: P 4.2.1.1
  • getegid: P 4.2.1.1
  • setuid: P 4.2.2.1 (stub on 9X, sets ENOSYS, returns zero)
  • setgid: P 4.2.2.1 (stub on 9X, sets ENOSYS, returns zero)
  • getgroups: P 4.2.3.1
  • getlogin: P 4.2.4.1
  • getlogin_r: P 4.2.4.1 -- unimplemented
  • getpgrp: P 4.3.1.1
  • setsid: P 4.3.2.1
  • setpgid: P 4.3.3.1
  • uname: P 4.4.1.1
  • time: C 4.12.2.4, P 4.5.1.1
  • times: P 4.5.2.1
  • getenv: C 4.10.4.4, P 4.6.1.1
  • ctermid: P 4.7.1.1
  • ttyname: P 4.7.2.1
  • ttyname_r: P 4.7.2.1 -- unimplemented
  • isatty: P 4.7.2.1
  • sysconf: P 4.8.1.1
• Files and Directories (Section 5)
  • opendir: P 5.1.2.1
  • readdir: P 5.1.2.1
  • readdir_r: P96 5.1.2.1 -- unimplemented
  • rewinddir: P 5.1.2.1
  • closedir: P 5.1.2.1
  • chdir: P 5.2.1.1
  • getcwd: P 5.2.2.1
  • open: P 5.3.1.1
  • creat: P 5.3.2.1
  • umask: P 5.3.3.1
  • link: P 5.3.4.1 (copy file in Win 95, and when link fails in NT)
  • mkdir: P 5.4.1.1
  • mkfifo: P 5.4.2.1 -- unimplemented!!!
  • unlink: P 5.5.1.1
  • rmdir: P 5.5.2.1
  • rename: C 4.9.4.2, P 5.5.3.1
  • stat: P 5.6.2.1
  • fstat: P 5.6.2.1
  • access: P 5.6.3.1
  • chmod: P 5.6.4.1
  • fchmod: P96 5.6.4.1
  • chown: P 5.6.5.1 (stub in Win 95; always returns zero)
  • utime: P 5.6.6.1
  • ftruncate: P96 5.6.7.1
  • pathconf: P 5.7.1.1
  • fpathconf: P 5.7.1.1
• Input and Output Primitives (Section 6)
  • pipe: P 6.1.1.1
  • dup: P 6.2.1.1
  • dup2: P 6.2.1.1
  • close: P 6.3.1.1
  • read: P 6.4.1.1
  • write: P 6.4.2.1
  • fcntl: P 6.5.2.1 (note: fcntl(fd, F_GETLK,...) is not implemented (returns -1 with errno set to ENOSYS)).
  • lseek: P 6.5.3.1 (note: only works correctly on binary files)
  • fsync: P96 6.6.1.1
  • fdatasync: P96 6.6.2.1 -- unimplemented
  • aio_read: P96 6.7.2.1 -- unimplemented
  • aio_write: P96 6.7.3.1 -- unimplemented
  • lio_listio: P96 6.7.4.1 -- unimplemented
  • aio_error: P96 6.7.5.1 -- unimplemented
  • aio_return: P96 6.7.6.1 -- unimplemented
  • aio_cancel: P96 6.7.7.1 -- unimplemented
  • aio_suspend: P96 6.7.8.1 -- unimplemented
  • aio_fsync: P96 6.7.9.1 -- unimplemented
• Device- and Class-Specific Functions (Section 7)
  • cfgetispeed: P96 7.1.3.1
  • cfgetospeed: P96 7.1.3.1
  • cfsetispeed: P96 7.1.3.1
  • cfsetospeed: P96 7.1.3.1
  • tcdrain: P 7.2.2.1
  • tcflow: P 7.2.2.1
  • tcflush: P 7.2.2.1
  • tcgetattr: P96 7.2.1.1
  • tcgetpgrp: P 7.2.3.1
  • tcsendbreak: P 7.2.2.1
  • tcsetattr: P96 7.2.1.1
  • tcsetpgrp: P 7.2.4.1
• Language-Specific Services for the C Programming Language (Section 8)
  • abort: C 4.10.4.1, P 8.2.3.12
  • asctime_r: P96 8.3.4.1 -- unimplemented
  • ctime_r: P96 8.3.5.1 -- unimplemented
  • exit: C 4.10.4.3, P 8.2.3.12
  • fclose: C 4.9.5.1, P 8.2.3.2
  • fdopen: P 8.2.2.1
  • fflush: C 4.9.5.2, P 8.2.3.4
  • fgetc: C 4.9.7.1, P 8.2.3.5
  • fgets: C 4.9.7.2, P 8.2.3.5
  • fileno: P 8.2.1.1
  • flockfile: P96 8.2.6.1 -- unimplemented
  • fopen: C 4.9.5.3, P 8.2.3.1
  • fprintf: C 4.9.7.3, P 8.2.3.6
  • fputc: C 4.9.7.3, P 8.2.3.6
  • fputs: C 4.9.7.4, P 8.2.3.6
  • fread: C 4.9.8.1, P 8.2.3.5
  • freopen: C 4.9.5.4, P 8.2.3.3
  • fscanf: C 4.9.6.2, P 8.2.3.7
  • fseek: C 4.9.9.2, P 8.2.3.7
  • ftell: C 4.9.9.4, P 8.2.3.10
  • ftrylockfile: P96 8.2.6.1 -- unimplemented
  • funlockfile: P96 8.2.6.1 -- unimplemented
  • fwrite: C 4.9.8.2, P 8.2.3.6
  • getc: C 4.9.7.5, P 8.2.3.5
  • getc_unlocked: P96 8.2.7.1 -- unimplemented
  • getchar: C 4.9.7.6, P 8.2.3.5
  • getchar_unlocked: P96 8.2.7.1 -- unimplemented
  • gets: C 4.9.7.7, P 8.2.3.5
  • gmtime_r: P96 8.3.6.1 -- unimplemented
  • localtime_r: P96 8.3.7.1 -- unimplemented
  • perror: C 4.9.10.4, P 8.2.3.8
  • printf: C 4.9.6.3, P 8.2.3.6
  • putc: C 4.9.7.8, P 8.2.3.6
  • putc_unlocked: P96 8.2.7.1 -- unimplemented
  • putchar: C 4.9.7.9, P 8.2.3.6
  • putchar_unlocked: P96 8.2.7.1 -- unimplemented
  • puts: C 4.9.7.10, P 8.2.3.6
  • rand_r: P96 8.3.8.1 -- unimplemented
  • remove: C 4.9.4.1, P 8.2.4
  • rewind: C 4.9.9.5, P 8.2.3.7
  • scanf: C 4.9.6.4, P 8.2.3.5
  • setlocale: C 4.4.1.1, P 8.1.2.1
  • siglongjmp: P 8.3.1.1
  • sigsetjmp: P 8.3.1.1
  • strtok_r: P96 8.3.3.1 -- unimplemented
  • tmpfile: C 4.9.4.3, P 8.2.3.9
  • tmpnam: C 4.9.4.4, P 8.2.5
  • tzset: P 8.3.2.1
• System Databases (Section 9)
  • getgrgid: P 9.2.1.1
  • getgrgid_r: P96 9.2.1.1 -- unimplemented
  • getgrnam: P 9.2.1.1
  • getgrnam_r: P96 9.2.1.1 -- unimplemented
  • getpwnam: P 9.2.2.1
  • getpwnam_r: P96 9.2.2.1 -- unimplemented
  • getpwuid: P 9.2.2.1
  • getpwuid_r: P96 9.2.2.1 -- unimplemented
• Synchronization (Section 11)
  • pthread_cond_broadcast: P96 11.4.3.1 -- unimplemented
  • pthread_cond_destroy: P96 11.4.2.1 -- unimplemented
  • pthread_cond_init: P96 11.4.2.1 -- unimplemented
  • pthread_cond_signal: P96 11.4.3.1 -- unimplemented
  • pthread_cond_timedwait: P96 11.4.4.1 -- unimplemented
  • pthread_cond_wait: P96 11.4.4.1 -- unimplemented
  • pthread_condattr_destroy: P96 11.4.1.1 -- unimplemented
  • pthread_condattr_getpshared: P96 11.4.1.1 -- unimplemented
  • pthread_condattr_init: P96 11.4.1.1 -- unimplemented
  • pthread_condattr_setpshared: P96 11.4.1.1 -- unimplemented
  • pthread_mutex_destroy: P96 11.3.2.1
  • pthread_mutex_init: P96 11.3.2.1
  • pthread_mutex_lock: P96 11.3.3.1
  • pthread_mutex_trylock: P96 11.3.3.1
  • pthread_mutex_unlock: P96 11.3.3.1
  • sem_close: P96 11.2.4.1 -- unimplemented
  • sem_destroy: P96 11.2.2.1
  • sem_getvalue: P96 11.2.8.1 -- unimplemented
  • sem_init: P96 11.2.1.1
  • sem_open: P96 11.2.3.1 -- unimplemented
  • sem_post: P96 11.2.7.1
  • sem_trywait: P96 11.2.6.1
  • sem_unlink: P96 11.2.5.1 -- unimplemented
  • sem_wait: P96 11.2.6.1
• Memory Management (Section 12)
  • mlock: P96 12.1.2.1 -- unimplemented
  • mlockall: P96 12.1.1.1 -- unimplemented
  • mmap: P96 12.2.1.1
  • mprotect: P96 12.2.3.1
  • msync: P96 12.2.4.1
  • munlock: P96 12.1.2.1 -- unimplemented
  • munlockall: P96 12.1.1.1 -- unimplemented
  • munmap: P96 12.2.2.1
  • shm_open: P96 12.3.1.1 -- unimplemented
  • shm_unlink: P96 12.3.2.1 -- unimplemented
• Execution Scheduling (Section 13)
  • pthread_attr_getinheritsched: P96 13.5.1.1 -- unimplemented
  • pthread_attr_getschedparam: P96 13.5.1.1 -- unimplemented
  • pthread_attr_getschedpolicy: P96 13.5.1.1 -- unimplemented
  • pthread_attr_getscope: P96 13.5.1.1 -- unimplemented
  • pthread_attr_setinheritsched: P96 13.5.1.1 -- unimplemented
  • pthread_attr_setschedparam: P96 13.5.1.1 -- unimplemented
  • pthread_attr_setschedpolicy: P96 13.5.1.1 -- unimplemented
  • pthread_attr_setscope: P96 13.5.1.1 -- unimplemented
  • pthread_getschedparam: P96 13.5.2.1 -- unimplemented
  • pthread_mutex_getprioceiling: P96 13.6.2.1 -- unimplemented
  • pthread_mutex_setprioceiling: P96 13.6.2.1 -- unimplemented
  • pthread_mutexattr_getprioceiling: P96 13.6.1.1 -- unimplemented
  • pthread_mutexattr_getprotocol: P96 13.6.1.1 -- unimplemented
  • pthread_mutexattr_setprioceiling: P96 13.6.1.1 -- unimplemented
  • pthread_mutexattr_setprotocol: P96 13.6.1.1 -- unimplemented
  • pthread_setschedparam: P96 13.5.2.1 -- unimplemented
  • sched_get_priority_max: P96 13.3.6.1 -- unimplemented
  • sched_get_priority_min: P96 13.3.6.1 -- unimplemented
  • sched_getparam: P96 13.3.2.1 -- unimplemented
  • sched_getscheduler: P96 13.3.4.1 -- unimplemented
  • sched_rr_get_interval: P96 13.3.6.1 -- unimplemented
  • sched_setparam: P96 13.3.1.1 -- unimplemented
  • sched_setscheduler: P96 13.3.3.1 -- unimplemented
  • sched_yield: P96 13.3.5.1 -- unimplemented
• Clocks and Timers (Section 14)
  • clock_getres: P96 14.2.1.1 -- unimplemented
  • clock_gettime: P96 14.2.1.1 -- unimplemented
  • clock_settime: P96 14.2.1.1 -- unimplemented
  • nanosleep: P96 14.2.5.1 -- unimplemented
  • timer_create: P96 14.2.2.1 -- unimplemented
  • timer_delete: P96 14.2.3.1 -- unimplemented
  • timer_getoverrun: P96 14.2.4.1 -- unimplemented
  • timer_gettime: P96 14.2.4.1 -- unimplemented
  • timer_settime: P96 14.2.4.1 -- unimplemented
• Message Passing (Section 15)
  • mq_close: P96 15.2.2.1 -- unimplemented
  • mq_getattr: P96 15.2.8.1 -- unimplemented
  • mq_notify: P96 15.2.6.1 -- unimplemented
  • mq_open: P96 15.2.1.1 -- unimplemented
  • mq_receive: P96 15.2.5.1 -- unimplemented
  • mq_send: P96 15.2.4.1 -- unimplemented
  • mq_setattr: P96 15.2.7.1 -- unimplemented
  • mq_unlink: P96 15.2.3.1 -- unimplemented
• Thread Management (Section 16)
  • pthread_attr_destroy: P96 16.2.1.1
  • pthread_attr_getdetachstate: P96 16.2.1.1 -- unimplemented
  • pthread_attr_getstackaddr: P96 16.2.1.1 -- unimplemented
  • pthread_attr_getstacksize: P96 16.2.1.1
  • pthread_attr_init: P96 16.2.1.1
  • pthread_attr_setdetachstate: P96 16.2.1.1 -- unimplemented
  • pthread_attr_setstackaddr: P96 16.2.1.1 -- unimplemented
  • pthread_attr_setstacksize: P96 16.2.1.1
  • pthread_create: P96 16.2.2.1
  • pthread_detach: P96 16.2.4.1 -- unimplemented
  • pthread_equal: P96 16.2.7.1
  • pthread_exit: P96 16.2.5.1
  • pthread_join: P96 16.2.3.1 -- unimplemented
  • pthread_once: P96 16.2.8.1 -- unimplemented
  • pthread_self: P96 16.2.6.1
• Thread-Specific Data (Section 17)
  • pthread_getspecific: P96 17.1.2.1
  • pthread_key_create: P96 17.1.1.1
  • pthread_key_delete: P96 17.1.3.1
  • pthread_setspecific: P96 17.1.2.1
• Thread Cancellation (Section 18)
  • pthread_cancel: P96 18.2.1.1 -- unimplemented
  • pthread_cleanup_pop: P96 18.2.3.1 -- unimplemented
  • pthread_cleanup_push: P96 18.2.3.1 -- unimplemented
  • pthread_setcancelstate: P96 18.2.2.1 -- unimplemented
  • pthread_setcanceltype: P96 18.2.2.1 -- unimplemented
  • pthread_testcancel: P96 18.2.2.1 -- unimplemented

  Misc Functions

  (Please note: This section has not yet been updated for the latest net release.)

• Networking (net.cc) (Standardized by POSIX 1.g, which is probably still in draft?)
  • accept
  • bind
  • connect
  • getdomainname
  • gethostbyaddr
  • gethostbyname
  • getpeername
  • getprotobyname
  • getprotobynumber
  • getservbyname
  • getservbyport
  • getsockname
  • getsockopt
  • herror
  • htonl
  • htons
  • inet_addr
  • inet_makeaddr
  • inet_netof
  • inet_ntoa
  • listen
  • ntohl
  • ntohs
  • rcmd
  • recv
  • recvfrom
  • rexec
  • rresvport
  • send
  • sendto
  • setsockopt
  • shutdown
  • socket
  • socketpair
  Of these networking calls, rexec, rcmd and rresvport are implemented in MS IP stack but may not be implemented in other vendors' stacks.
• Other
  • acl
  • aclcheck
  • aclfrommode
  • aclfrompbits
  • aclfromtext
  • aclsort
  • acltomode
  • acltopbits
  • acltotext
  • chroot (with restrictions)
  • closelog
  • cwait
  • cygwin_conv_to_full_posix_path
  • cygwin_conv_to_full_win32_path
  • cygwin_conv_to_posix_path
  • cygwin_conv_to_win32_path
  • cygwin_logon_user
  • cygwin_posix_path_list_p
  • cygwin_posix_to_win32_path_list
  • cygwin_posix_to_win32_path_list_buf_size
  • cygwin_set_impersonation_token
  • cygwin_split_path
  • cygwin_win32_to_posix_path_list
  • cygwin_win32_to_posix_path_list_buf_size
  • cygwin_winpid_to_pid
  • dlclose
  • dlerror
  • dlfork
  • dlopen
  • dlsym
  • endgrent
  • endhostent
  • facl
  • ffs
  • fstatfs
  • ftime
  • get_osfhandle
  • getdtablesize
  • getgrent
  • gethostname
  • getitimer
  • getmntent
  • getpagesize
  • getpgid
  • getpwent
  • gettimeofday: BSD
  • grantpt
  • initgroups (stub)
  • ioctl
  • killpg
  • login
  • logout
  • lstat
  • mknod (stub, sets ENOSYS, returns -1)
  • memccpy
  • nice
  • openlog
  • pclose
  • popen
  • ptsname
  • putenv
  • random
  • readv
  • realpath
  • regfree
  • rexec
  • select
  • setegid: SVR4 (stub on 9X, sets ENOSYS, returns zero)@item endpwent
  • setenv
  • seterrno
  • seteuid (stub on 9X, sets ENOSYS, returns zero)
  • sethostent
  • setitimer
  • setmntent
  • setmode
  • setpassent
  • setpgrp
  • setpwent
  • settimeofday: BSD (stub, set ENOSYS, return -1)
  • sexecl
  • sexecle
  • sexeclp
  • sexeclpe
  • sexeclpe
  • sexecp
  • sexecv
  • sexecve
  • sexecvpe
  • sigpause
  • spawnl (spawn calls are from Windows C library)
  • spawnle
  • spawnlp
  • spawnlpe
  • spawnv
  • spawnve
  • spawnvp
  • spawnvpe
  • srandom
  • statfs
  • strsignal
  • strtosigno
  • swab
  • syslog
  • timezone
  • truncate (SVR4/4.3+BSD)
  • ttyslot
  • unlockpt
  • unsetenv
  • usleep
  • utimes
  • vfork: stub that calls fork
  • vhangup (stub, sets ENOSYS, returns -1)
  • wait3
  • wait4
  • wcscmp
  • wcslen
  • wprintf
  • writev

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