910 lines
42 KiB
OCaml
910 lines
42 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* Module [Unix]: interface to the Unix system *)
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(*** Error report *)
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type error =
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(* Errors defined in the POSIX standard *)
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E2BIG (* Argument list too long *)
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| EACCES (* Permission denied *)
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| EAGAIN (* Resource temporarily unavailable; try again *)
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| EBADF (* Bad file descriptor *)
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| EBUSY (* Resource unavailable *)
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| ECHILD (* No child process *)
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| EDEADLK (* Resource deadlock would occur *)
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| EDOM (* Domain error for math functions, etc. *)
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| EEXIST (* File exists *)
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| EFAULT (* Bad address *)
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| EFBIG (* File too large *)
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| EINTR (* Function interrupted by signal *)
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| EINVAL (* Invalid argument *)
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| EIO (* Hardware I/O error *)
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| EISDIR (* Is a directory *)
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| EMFILE (* Too many open files by the process *)
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| EMLINK (* Too many links *)
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| ENAMETOOLONG (* Filename too long *)
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| ENFILE (* Too many open files in the system *)
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| ENODEV (* No such device *)
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| ENOENT (* No such file or directory *)
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| ENOEXEC (* Not an executable file *)
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| ENOLCK (* No locks available *)
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| ENOMEM (* Not enough memory *)
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| ENOSPC (* No space left on device *)
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| ENOSYS (* Function not supported *)
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| ENOTDIR (* Not a directory *)
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| ENOTEMPTY (* Directory not empty *)
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| ENOTTY (* Inappropriate I/O control operation *)
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| ENXIO (* No such device or address *)
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| EPERM (* Operation not permitted *)
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| EPIPE (* Broken pipe *)
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| ERANGE (* Result too large *)
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| EROFS (* Read-only file system *)
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| ESPIPE (* Invalid seek e.g. on a pipe *)
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| ESRCH (* No such process *)
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| EXDEV (* Invalid link *)
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(* Additional errors, mostly BSD *)
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| EWOULDBLOCK (* Operation would block *)
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| EINPROGRESS (* Operation now in progress *)
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| EALREADY (* Operation already in progress *)
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| ENOTSOCK (* Socket operation on non-socket *)
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| EDESTADDRREQ (* Destination address required *)
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| EMSGSIZE (* Message too long *)
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| EPROTOTYPE (* Protocol wrong type for socket *)
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| ENOPROTOOPT (* Protocol not available *)
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| EPROTONOSUPPORT (* Protocol not supported *)
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| ESOCKTNOSUPPORT (* Socket type not supported *)
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| EOPNOTSUPP (* Operation not supported on socket *)
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| EPFNOSUPPORT (* Protocol family not supported *)
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| EAFNOSUPPORT (* Address family not supported by protocol family *)
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| EADDRINUSE (* Address already in use *)
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| EADDRNOTAVAIL (* Can't assign requested address *)
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| ENETDOWN (* Network is down *)
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| ENETUNREACH (* Network is unreachable *)
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| ENETRESET (* Network dropped connection on reset *)
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| ECONNABORTED (* Software caused connection abort *)
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| ECONNRESET (* Connection reset by peer *)
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| ENOBUFS (* No buffer space available *)
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| EISCONN (* Socket is already connected *)
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| ENOTCONN (* Socket is not connected *)
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| ESHUTDOWN (* Can't send after socket shutdown *)
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| ETOOMANYREFS (* Too many references: can't splice *)
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| ETIMEDOUT (* Connection timed out *)
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| ECONNREFUSED (* Connection refused *)
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| EHOSTDOWN (* Host is down *)
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| EHOSTUNREACH (* No route to host *)
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| ELOOP (* Too many levels of symbolic links *)
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(* All other errors are mapped to EUNKNOWNERR *)
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| EUNKNOWNERR of int (* Unknown error *)
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(* The type of error codes. *)
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exception Unix_error of error * string * string
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(* Raised by the system calls below when an error is encountered.
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The first component is the error code; the second component
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is the function name; the third component is the string parameter
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to the function, if it has one, or the empty string otherwise. *)
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external error_message : error -> string = "unix_error_message"
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(* Return a string describing the given error code. *)
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val handle_unix_error : ('a -> 'b) -> 'a -> 'b
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(* [handle_unix_error f x] applies [f] to [x] and returns the result.
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If the exception [Unix_error] is raised, it prints a message
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describing the error and exits with code 2. *)
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(*** Interface with the parent process *)
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external environment : unit -> string array = "unix_environment"
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(* Return the process environment, as an array of strings
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with the format ``variable=value''. See also [Sys.getenv]. *)
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(*** Process handling *)
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type process_status =
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WEXITED of int
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| WSIGNALED of int
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| WSTOPPED of int
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(* The termination status of a process. [WEXITED] means that the
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process terminated normally by [exit]; the argument is the return
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code. [WSIGNALED] means that the process was killed by a signal;
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the argument is the signal number. [WSTOPPED] means
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that the process was stopped by a signal; the argument is the
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signal number. *)
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type wait_flag =
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WNOHANG
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| WUNTRACED
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(* Flags for [waitopt] and [waitpid].
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[WNOHANG] means do not block if no child has
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died yet, but immediately return with a pid equal to 0.
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[WUNTRACED] means report also the children that receive stop
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signals. *)
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external execv : string -> string array -> unit = "unix_execv"
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(* [execv prog args] execute the program in file [prog], with
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the arguments [args], and the current process environment. *)
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external execve : string -> string array -> string array -> unit = "unix_execve"
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(* Same as [execv], except that the third argument provides the
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environment to the program executed. *)
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external execvp : string -> string array -> unit = "unix_execvp"
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external execvpe : string -> string array -> string array -> unit = "unix_execvpe"
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(* Same as [execv] and [execvp] respectively, except that
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the program is searched in the path. *)
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external fork : unit -> int = "unix_fork"
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(* Fork a new process. The returned integer is 0 for the child
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process, the pid of the child process for the parent process. *)
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external wait : unit -> int * process_status = "unix_wait"
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(* Wait until one of the children processes die, and return its pid
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and termination status. *)
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external waitpid : wait_flag list -> int -> int * process_status
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= "unix_waitpid"
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(* Same as [wait], but waits for the process whose pid is given.
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A pid of [-1] means wait for any child.
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A pid of [0] means wait for any child in the same process group
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as the current process.
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Negative pid arguments represent process groups.
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The list of options indicates whether [waitpid] should return
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immediately without waiting, or also report stopped children. *)
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val system : string -> process_status
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(* Execute the given command, wait until it terminates, and return
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its termination status. The string is interpreted by the shell
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[/bin/sh] and therefore can contain redirections, quotes, variables,
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etc. The result [WEXITED 127] indicates that the shell couldn't
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be executed. *)
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external getpid : unit -> int = "unix_getpid"
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(* Return the pid of the process. *)
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external getppid : unit -> int = "unix_getppid"
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(* Return the pid of the parent process. *)
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external nice : int -> int = "unix_nice"
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(* Change the process priority. The integer argument is added to the
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``nice'' value. (Higher values of the ``nice'' value mean
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lower priorities.) Return the new nice value. *)
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(*** Basic file input/output *)
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type file_descr
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(* The abstract type of file descriptors. *)
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val stdin : file_descr
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val stdout : file_descr
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val stderr : file_descr
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(* File descriptors for standard input, standard output and
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standard error. *)
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type open_flag =
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O_RDONLY (* Open for reading *)
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| O_WRONLY (* Open for writing *)
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| O_RDWR (* Open for reading and writing *)
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| O_NONBLOCK (* Open in non-blocking mode *)
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| O_APPEND (* Open for append *)
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| O_CREAT (* Create if nonexistent *)
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| O_TRUNC (* Truncate to 0 length if existing *)
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| O_EXCL (* Fail if existing *)
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(* The flags to [open]. *)
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type file_perm = int
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(* The type of file access rights. *)
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external openfile : string -> open_flag list -> file_perm -> file_descr
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= "unix_open"
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(* Open the named file with the given flags. Third argument is
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the permissions to give to the file if it is created. Return
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a file descriptor on the named file. *)
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external close : file_descr -> unit = "unix_close"
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(* Close a file descriptor. *)
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val read : file_descr -> string -> int -> int -> int
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(* [read fd buff ofs len] reads [len] characters from descriptor
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[fd], storing them in string [buff], starting at position [ofs]
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in string [buff]. Return the number of characters actually read. *)
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val write : file_descr -> string -> int -> int -> int
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(* [write fd buff ofs len] writes [len] characters to descriptor
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[fd], taking them from string [buff], starting at position [ofs]
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in string [buff]. Return the number of characters actually
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written. *)
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(*** Interfacing with the standard input/output library. *)
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external in_channel_of_descr : file_descr -> in_channel
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= "caml_open_descriptor"
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(* Create an input channel reading from the given descriptor. *)
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external out_channel_of_descr : file_descr -> out_channel
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= "caml_open_descriptor"
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(* Create an output channel writing on the given descriptor. *)
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external descr_of_in_channel : in_channel -> file_descr = "channel_descriptor"
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(* Return the descriptor corresponding to an input channel. *)
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external descr_of_out_channel : out_channel -> file_descr
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= "channel_descriptor"
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(* Return the descriptor corresponding to an output channel. *)
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(*** Seeking and truncating *)
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type seek_command =
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SEEK_SET
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| SEEK_CUR
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| SEEK_END
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(* Positioning modes for [lseek]. [SEEK_SET] indicates positions
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relative to the beginning of the file, [SEEK_CUR] relative to
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the current position, [SEEK_END] relative to the end of the
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file. *)
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external lseek : file_descr -> int -> seek_command -> int = "unix_lseek"
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(* Set the current position for a file descriptor *)
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external truncate : string -> int -> unit = "unix_truncate"
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(* Truncates the named file to the given size. *)
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external ftruncate : file_descr -> int -> unit = "unix_ftruncate"
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(* Truncates the file corresponding to the given descriptor
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to the given size. *)
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(*** File statistics *)
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type file_kind =
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S_REG (* Regular file *)
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| S_DIR (* Directory *)
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| S_CHR (* Character device *)
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| S_BLK (* Block device *)
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| S_LNK (* Symbolic link *)
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| S_FIFO (* Named pipe *)
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| S_SOCK (* Socket *)
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type stats =
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{ st_dev : int; (* Device number *)
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st_ino : int; (* Inode number *)
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st_kind : file_kind; (* Kind of the file *)
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st_perm : file_perm; (* Access rights *)
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st_nlink : int; (* Number of links *)
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st_uid : int; (* User id of the owner *)
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st_gid : int; (* Group id of the owner *)
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st_rdev : int; (* Device minor number *)
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st_size : int; (* Size in bytes *)
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st_atime : int; (* Last access time *)
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st_mtime : int; (* Last modification time *)
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st_ctime : int } (* Last status change time *)
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(* The informations returned by the [stat] calls. *)
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external stat : string -> stats = "unix_stat"
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(* Return the information for the named file. *)
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external lstat : string -> stats = "unix_lstat"
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(* Same as [stat], but in case the file is a symbolic link,
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return the information for the link itself. *)
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external fstat : file_descr -> stats = "unix_fstat"
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(* Return the information for the file associated with the given
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descriptor. *)
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(*** Operations on file names *)
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external unlink : string -> unit = "unix_unlink"
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(* Removes the named file *)
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external rename : string -> string -> unit = "unix_rename"
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(* [rename old new] changes the name of a file from [old] to [new]. *)
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external link : string -> string -> unit = "unix_link"
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(* [link source dest] creates a hard link named [dest] to the file
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named [new]. *)
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(*** File permissions and ownership *)
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type access_permission =
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R_OK (* Read permission *)
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| W_OK (* Write permission *)
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| X_OK (* Execution permission *)
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| F_OK (* File exists *)
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(* Flags for the [access] call. *)
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external chmod : string -> file_perm -> unit = "unix_chmod"
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(* Change the permissions of the named file. *)
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external fchmod : file_descr -> file_perm -> unit = "unix_fchmod"
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(* Change the permissions of an opened file. *)
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external chown : string -> int -> int -> unit = "unix_chown"
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(* Change the owner uid and owner gid of the named file. *)
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external fchown : file_descr -> int -> int -> unit = "unix_fchown"
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(* Change the owner uid and owner gid of an opened file. *)
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external umask : int -> int = "unix_umask"
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(* Set the process creation mask, and return the previous mask. *)
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external access : string -> access_permission list -> unit = "unix_access"
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(* Check that the process has the given permissions over the named
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file. Raise [Unix_error] otherwise. *)
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(*** Operations on file descriptors *)
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external dup : file_descr -> file_descr = "unix_dup"
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(* Return a new file descriptor referencing the same file as
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the given descriptor. *)
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external dup2 : file_descr -> file_descr -> unit = "unix_dup2"
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(* [dup2 fd1 fd2] duplicates [fd1] to [fd2], closing [fd2] if already
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opened. *)
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external set_nonblock : file_descr -> unit = "unix_set_nonblock"
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external clear_nonblock : file_descr -> unit = "unix_clear_nonblock"
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(* Set or clear the ``non-blocking'' flag on the given descriptor.
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When the non-blocking flag is set, reading on a descriptor
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on which there is temporarily no data available raises the
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[EAGAIN] or [EWOULDBLOCK] error instead of blocking;
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writing on a descriptor on which there is temporarily no room
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for writing also raises [EAGAIN] or [EWOULDBLOCK]. *)
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external set_close_on_exec : file_descr -> unit = "unix_set_close_on_exec"
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external clear_close_on_exec : file_descr -> unit = "unix_clear_close_on_exec"
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(* Set or clear the ``close-on-exec'' flag on the given descriptor.
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A descriptor with the close-on-exec flag is automatically
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closed when the current process starts another program with
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one of the [exec] functions. *)
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(*** Directories *)
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external mkdir : string -> file_perm -> unit = "unix_mkdir"
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(* Create a directory with the given permissions. *)
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external rmdir : string -> unit = "unix_rmdir"
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(* Remove an empty directory. *)
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external chdir : string -> unit = "unix_chdir"
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(* Change the process working directory. *)
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external getcwd : unit -> string = "unix_getcwd"
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(* Return the name of the current working directory. *)
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type dir_handle
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(* The type of descriptors over opened directories. *)
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external opendir : string -> dir_handle = "unix_opendir"
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(* Open a descriptor on a directory *)
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external readdir : dir_handle -> string = "unix_readdir"
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(* Return the next entry in a directory.
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Raise [End_of_file] when the end of the directory has been
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reached. *)
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external rewinddir : dir_handle -> unit = "unix_rewinddir"
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(* Reposition the descriptor to the beginning of the directory *)
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external closedir : dir_handle -> unit = "unix_closedir"
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(* Close a directory descriptor. *)
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(*** Pipes and redirections *)
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external pipe : unit -> file_descr * file_descr = "unix_pipe"
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(* Create a pipe. The first component of the result is opened
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for reading, that's the exit to the pipe. The second component is
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opened for writing, that's the entrance to the pipe. *)
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external mkfifo : string -> file_perm -> unit = "unix_mkfifo"
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(* Create a named pipe with the given permissions. *)
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(*** High-level process and redirection management *)
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val create_process :
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string -> string array -> file_descr -> file_descr -> file_descr -> int
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(* [create_process prog args new_stdin new_stdout new_stderr]
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forks a new process that executes the program
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in file [prog], with arguments [args]. The pid of the new
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process is returned immediately; the new process executes
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concurrently with the current process.
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The standard input and outputs of the new process are connected
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to the descriptors [new_stdin], [new_stdout] and [new_stderr].
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Passing e.g. [stdout] for [new_stdout] prevents the redirection
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and causes the new process to have the same standard output
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as the current process.
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The executable file [prog] is searched in the path.
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The new process has the same environment as the current process.
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All file descriptors of the current process are closed in the
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new process, except those redirected to standard input and
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outputs. *)
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val create_process_env :
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string -> string array -> string array ->
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file_descr -> file_descr -> file_descr -> int
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(* [create_process_env prog args env new_stdin new_stdout new_stderr]
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works as [create_process], except that the extra argument
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[env] specifies the environment passed to the program. *)
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val open_process_in: string -> in_channel
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val open_process_out: string -> out_channel
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val open_process: string -> in_channel * out_channel
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(* High-level pipe and process management. These functions
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run the given command in parallel with the program,
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and return channels connected to the standard input and/or
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the standard output of the command. The command is interpreted
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by the shell [/bin/sh] (cf. [system]). Warning: writes on channels
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are buffered, hence be careful to call [flush] at the right times
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to ensure correct synchronization. *)
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val close_process_in: in_channel -> process_status
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val close_process_out: out_channel -> process_status
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val close_process: in_channel * out_channel -> process_status
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(* Close channels opened by [open_process_in], [open_process_out]
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and [open_process], respectively, wait for the associated
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command to terminate, and return its termination status. *)
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(*** Symbolic links *)
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external symlink : string -> string -> unit = "unix_symlink"
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(* [symlink source dest] creates the file [dest] as a symbolic link
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to the file [source]. *)
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external readlink : string -> string = "unix_readlink"
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(* Read the contents of a link. *)
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(*** Polling *)
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external select :
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file_descr list -> file_descr list -> file_descr list -> float ->
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file_descr list * file_descr list * file_descr list = "unix_select"
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(* Wait until some input/output operations become possible on
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some channels. The three list arguments are, respectively, a set
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of descriptors to check for reading (first argument), for writing
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(second argument), or for exceptional conditions (third argument).
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The fourth argument is the maximal timeout, in seconds; a
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negative fourth argument means no timeout (unbounded wait).
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The result is composed of three sets of descriptors: those ready
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for reading (first component), ready for writing (second component),
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and over which an exceptional condition is pending (third
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component). *)
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(*** Locking *)
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|
type lock_command =
|
|
F_ULOCK (* Unlock a region *)
|
|
| F_LOCK (* Lock a region, and block if already locked *)
|
|
| F_TLOCK (* Lock a region, or fail if already locked *)
|
|
| F_TEST (* Test a region for other process' locks *)
|
|
|
|
(* Commands for [lockf]. *)
|
|
|
|
external lockf : file_descr -> lock_command -> int -> unit = "unix_lockf"
|
|
|
|
(* [lockf fd cmd size] puts a lock on a region of the file opened
|
|
as [fd]. The region starts at the current read/write position for
|
|
[fd] (as set by [lseek]), and extends [size] bytes forward if
|
|
[size] is positive, [size] bytes backwards if [size] is negative,
|
|
or to the end of the file if [size] is zero. *)
|
|
|
|
(*** Signals *)
|
|
|
|
external kill : int -> int -> unit = "unix_kill"
|
|
(* [kill pid sig] sends signal number [sig] to the process
|
|
with id [pid]. *)
|
|
external pause : unit -> unit = "unix_pause"
|
|
(* Wait until a non-ignored signal is delivered. *)
|
|
|
|
|
|
(*** Time functions *)
|
|
|
|
type process_times =
|
|
{ tms_utime : float; (* User time for the process *)
|
|
tms_stime : float; (* System time for the process *)
|
|
tms_cutime : float; (* User time for the children processes *)
|
|
tms_cstime : float } (* System time for the children processes *)
|
|
|
|
(* The execution times (CPU times) of a process. *)
|
|
|
|
type tm =
|
|
{ tm_sec : int; (* Seconds 0..59 *)
|
|
tm_min : int; (* Minutes 0..59 *)
|
|
tm_hour : int; (* Hours 0..23 *)
|
|
tm_mday : int; (* Day of month 1..31 *)
|
|
tm_mon : int; (* Month of year 0..11 *)
|
|
tm_year : int; (* Year - 1900 *)
|
|
tm_wday : int; (* Day of week (Sunday is 0) *)
|
|
tm_yday : int; (* Day of year 0..365 *)
|
|
tm_isdst : bool } (* Daylight time savings in effect *)
|
|
|
|
(* The type representing wallclock time and calendar date. *)
|
|
|
|
external time : unit -> int = "unix_time"
|
|
(* Return the current time since 00:00:00 GMT, Jan. 1, 1970,
|
|
in seconds. *)
|
|
external gettimeofday : unit -> float = "unix_gettimeofday"
|
|
(* Same as [time], but with resolution better than 1 second. *)
|
|
external gmtime : int -> tm = "unix_gmtime"
|
|
(* Convert a time in seconds, as returned by [time], into a date and
|
|
a time. Assumes Greenwich meridian time zone. *)
|
|
external localtime : int -> tm = "unix_localtime"
|
|
(* Convert a time in seconds, as returned by [time], into a date and
|
|
a time. Assumes the local time zone. *)
|
|
external mktime : tm -> int * tm = "unix_mktime"
|
|
(* Convert a date and time, specified by the [tm] argument, into
|
|
a time in seconds, as returned by [time]. Also return a normalized
|
|
copy of the given [tm] record, with the [tm_wday] and [tm_yday]
|
|
recomputed from the other fields. *)
|
|
external alarm : int -> int = "unix_alarm"
|
|
(* Schedule a [SIGALRM] signals after the given number of seconds. *)
|
|
external sleep : int -> unit = "unix_sleep"
|
|
(* Stop execution for the given number of seconds. *)
|
|
external times : unit -> process_times =
|
|
"unix_times_bytecode" "unix_times_native"
|
|
(* Return the execution times of the process. *)
|
|
external utimes : string -> int -> int -> unit = "unix_utimes"
|
|
(* Set the last access time (second arg) and last modification time
|
|
(third arg) for a file. Times are expressed in seconds from
|
|
00:00:00 GMT, Jan. 1, 1970. *)
|
|
|
|
type interval_timer =
|
|
ITIMER_REAL
|
|
| ITIMER_VIRTUAL
|
|
| ITIMER_PROF
|
|
(* The three kinds of interval timers.
|
|
[ITIMER_REAL] decrements in real time, and sends the signal
|
|
[SIGALRM] when expired.
|
|
[ITIMER_VIRTUAL] decrements in process virtual time, and sends
|
|
[SIGVTALRM] when expired.
|
|
[ITIMER_PROF] (for profiling) decrements both when the process
|
|
is running and when the system is running on behalf of the
|
|
process; it sends [SIGPROF] when expired. *)
|
|
|
|
type interval_timer_status =
|
|
{ it_interval: float; (* Period *)
|
|
it_value: float } (* Current value of the timer *)
|
|
(* The type describing the status of an interval timer *)
|
|
|
|
external getitimer: interval_timer -> interval_timer_status
|
|
= "unix_getitimer" "unix_getitimer_native"
|
|
(* Return the current status of the given interval timer. *)
|
|
external setitimer:
|
|
interval_timer -> interval_timer_status -> interval_timer_status
|
|
= "unix_setitimer" "unix_setitimer_native"
|
|
(* [setitimer t s] sets the interval timer [t] and returns
|
|
its previous status. The [s] argument is interpreted as follows:
|
|
[s.it_value], if nonzero, is the time to the next timer expiration;
|
|
[s.it_interval], if nonzero, specifies a value to
|
|
be used in reloading it_value when the timer expires.
|
|
Setting [s.it_value] to zero disable the timer.
|
|
Setting [s.it_interval] to zero causes the timer to be disabled
|
|
after its next expiration. *)
|
|
|
|
(*** User id, group id *)
|
|
|
|
external getuid : unit -> int = "unix_getuid"
|
|
(* Return the user id of the user executing the process. *)
|
|
external geteuid : unit -> int = "unix_geteuid"
|
|
(* Return the effective user id under which the process runs. *)
|
|
external setuid : int -> unit = "unix_setuid"
|
|
(* Set the real user id and effective user id for the process. *)
|
|
external getgid : unit -> int = "unix_getgid"
|
|
(* Return the group id of the user executing the process. *)
|
|
external getegid : unit -> int = "unix_getegid"
|
|
(* Return the effective group id under which the process runs. *)
|
|
external setgid : int -> unit = "unix_setgid"
|
|
(* Set the real group id and effective group id for the process. *)
|
|
external getgroups : unit -> int array = "unix_getgroups"
|
|
(* Return the list of groups to which the user executing the process
|
|
belongs. *)
|
|
|
|
|
|
type passwd_entry =
|
|
{ pw_name : string;
|
|
pw_passwd : string;
|
|
pw_uid : int;
|
|
pw_gid : int;
|
|
pw_gecos : string;
|
|
pw_dir : string;
|
|
pw_shell : string }
|
|
(* Structure of entries in the [passwd] database. *)
|
|
|
|
type group_entry =
|
|
{ gr_name : string;
|
|
gr_passwd : string;
|
|
gr_gid : int;
|
|
gr_mem : string array }
|
|
(* Structure of entries in the [groups] database. *)
|
|
|
|
external getlogin : unit -> string = "unix_getlogin"
|
|
(* Return the login name of the user executing the process. *)
|
|
external getpwnam : string -> passwd_entry = "unix_getpwnam"
|
|
(* Find an entry in [passwd] with the given name, or raise
|
|
[Not_found]. *)
|
|
external getgrnam : string -> group_entry = "unix_getgrnam"
|
|
(* Find an entry in [group] with the given name, or raise
|
|
[Not_found]. *)
|
|
external getpwuid : int -> passwd_entry = "unix_getpwuid"
|
|
(* Find an entry in [passwd] with the given user id, or raise
|
|
[Not_found]. *)
|
|
external getgrgid : int -> group_entry = "unix_getgrgid"
|
|
(* Find an entry in [group] with the given group id, or raise
|
|
[Not_found]. *)
|
|
|
|
|
|
(*** Internet addresses *)
|
|
|
|
type inet_addr
|
|
(* The abstract type of Internet addresses. *)
|
|
|
|
external inet_addr_of_string : string -> inet_addr
|
|
= "unix_inet_addr_of_string"
|
|
external string_of_inet_addr : inet_addr -> string
|
|
= "unix_string_of_inet_addr"
|
|
(* Conversions between string with the format [XXX.YYY.ZZZ.TTT]
|
|
and Internet addresses. [inet_addr_of_string] raises [Failure]
|
|
when given a string that does not match this format. *)
|
|
|
|
val inet_addr_any : inet_addr
|
|
(* A special Internet address, for use only with [bind], representing
|
|
all the Internet addresses that the host machine possesses. *)
|
|
|
|
(*** Sockets *)
|
|
|
|
type socket_domain =
|
|
PF_UNIX (* Unix domain *)
|
|
| PF_INET (* Internet domain *)
|
|
|
|
(* The type of socket domains. *)
|
|
|
|
type socket_type =
|
|
SOCK_STREAM (* Stream socket *)
|
|
| SOCK_DGRAM (* Datagram socket *)
|
|
| SOCK_RAW (* Raw socket *)
|
|
| SOCK_SEQPACKET (* Sequenced packets socket *)
|
|
|
|
(* The type of socket kinds, specifying the semantics of
|
|
communications. *)
|
|
|
|
type sockaddr =
|
|
ADDR_UNIX of string
|
|
| ADDR_INET of inet_addr * int
|
|
|
|
(* The type of socket addresses. [ADDR_UNIX name] is a socket
|
|
address in the Unix domain; [name] is a file name in the file
|
|
system. [ADDR_INET(addr,port)] is a socket address in the Internet
|
|
domain; [addr] is the Internet address of the machine, and
|
|
[port] is the port number. *)
|
|
|
|
external socket : socket_domain -> socket_type -> int -> file_descr
|
|
= "unix_socket"
|
|
(* Create a new socket in the given domain, and with the
|
|
given kind. The third argument is the protocol type; 0 selects
|
|
the default protocol for that kind of sockets. *)
|
|
external socketpair :
|
|
socket_domain -> socket_type -> int -> file_descr * file_descr
|
|
= "unix_socketpair"
|
|
(* Create a pair of unnamed sockets, connected together. *)
|
|
external accept : file_descr -> file_descr * sockaddr = "unix_accept"
|
|
(* Accept connections on the given socket. The returned descriptor
|
|
is a socket connected to the client; the returned address is
|
|
the address of the connecting client. *)
|
|
external bind : file_descr -> sockaddr -> unit = "unix_bind"
|
|
(* Bind a socket to an address. *)
|
|
external connect : file_descr -> sockaddr -> unit = "unix_connect"
|
|
(* Connect a socket to an address. *)
|
|
external listen : file_descr -> int -> unit = "unix_listen"
|
|
(* Set up a socket for receiving connection requests. The integer
|
|
argument is the maximal number of pending requests. *)
|
|
|
|
type shutdown_command =
|
|
SHUTDOWN_RECEIVE (* Close for receiving *)
|
|
| SHUTDOWN_SEND (* Close for sending *)
|
|
| SHUTDOWN_ALL (* Close both *)
|
|
(* The type of commands for [shutdown]. *)
|
|
|
|
external shutdown : file_descr -> shutdown_command -> unit = "unix_shutdown"
|
|
(* Shutdown a socket connection. [SHUTDOWN_SEND] as second argument
|
|
causes reads on the other end of the connection to return
|
|
an end-of-file condition.
|
|
[SHUTDOWN_RECEIVE] causes writes on the other end of the connection
|
|
to return a closed pipe condition ([SIGPIPE] signal). *)
|
|
|
|
external getsockname : file_descr -> sockaddr = "unix_getsockname"
|
|
(* Return the address of the given socket. *)
|
|
external getpeername : file_descr -> sockaddr = "unix_getpeername"
|
|
(* Return the address of the host connected to the given socket. *)
|
|
|
|
type msg_flag =
|
|
MSG_OOB
|
|
| MSG_DONTROUTE
|
|
| MSG_PEEK
|
|
(* The flags for [recv], [recvfrom], [send] and [sendto]. *)
|
|
|
|
val recv : file_descr -> string -> int -> int -> msg_flag list -> int
|
|
val recvfrom :
|
|
file_descr -> string -> int -> int -> msg_flag list -> int * sockaddr
|
|
(* Receive data from an unconnected socket. *)
|
|
val send : file_descr -> string -> int -> int -> msg_flag list -> int
|
|
val sendto :
|
|
file_descr -> string -> int -> int -> msg_flag list -> sockaddr -> int
|
|
(* Send data over an unconnected socket. *)
|
|
|
|
type socket_option =
|
|
SO_DEBUG (* Record debugging information *)
|
|
| SO_BROADCAST (* Permit sending of broadcast messages *)
|
|
| SO_REUSEADDR (* Allow reuse of local addresses for bind *)
|
|
| SO_KEEPALIVE (* Keep connection active *)
|
|
| SO_DONTROUTE (* Bypass the standard routing algorithms *)
|
|
| SO_OOBINLINE (* Leave out-of-band data in line *)
|
|
(* The socket options settable with [setsockopt]. *)
|
|
|
|
external getsockopt : file_descr -> socket_option -> bool = "unix_getsockopt"
|
|
(* Return the current status of an option in the given socket. *)
|
|
external setsockopt : file_descr -> socket_option -> bool -> unit
|
|
= "unix_setsockopt"
|
|
(* Set or clear an option in the given socket. *)
|
|
|
|
(*** High-level network connection functions *)
|
|
|
|
val open_connection : sockaddr -> in_channel * out_channel
|
|
(* Connect to a server at the given address.
|
|
Return a pair of buffered channels connected to the server.
|
|
Remember to call [flush] on the output channel at the right times
|
|
to ensure correct synchronization. *)
|
|
val shutdown_connection : in_channel -> unit
|
|
(* ``Shut down'' a connection established with [open_connection];
|
|
that is, transmit an end-of-file condition to the server reading
|
|
on the other side of the connection. *)
|
|
val establish_server : (in_channel -> out_channel -> 'a) -> sockaddr -> unit
|
|
(* Establish a server on the given address.
|
|
The function given as first argument is called for each connection
|
|
with two buffered channels connected to the client. A new process
|
|
is created for each connection. The function [establish_server]
|
|
never returns normally. *)
|
|
|
|
|
|
(*** Host and protocol databases *)
|
|
|
|
type host_entry =
|
|
{ h_name : string;
|
|
h_aliases : string array;
|
|
h_addrtype : socket_domain;
|
|
h_addr_list : inet_addr array }
|
|
(* Structure of entries in the [hosts] database. *)
|
|
|
|
type protocol_entry =
|
|
{ p_name : string;
|
|
p_aliases : string array;
|
|
p_proto : int }
|
|
(* Structure of entries in the [protocols] database. *)
|
|
|
|
type service_entry =
|
|
{ s_name : string;
|
|
s_aliases : string array;
|
|
s_port : int;
|
|
s_proto : string }
|
|
(* Structure of entries in the [services] database. *)
|
|
|
|
external gethostname : unit -> string = "unix_gethostname"
|
|
(* Return the name of the local host. *)
|
|
external gethostbyname : string -> host_entry = "unix_gethostbyname"
|
|
(* Find an entry in [hosts] with the given name, or raise
|
|
[Not_found]. *)
|
|
external gethostbyaddr : inet_addr -> host_entry = "unix_gethostbyaddr"
|
|
(* Find an entry in [hosts] with the given address, or raise
|
|
[Not_found]. *)
|
|
external getprotobyname : string -> protocol_entry
|
|
= "unix_getprotobyname"
|
|
(* Find an entry in [protocols] with the given name, or raise
|
|
[Not_found]. *)
|
|
external getprotobynumber : int -> protocol_entry
|
|
= "unix_getprotobynumber"
|
|
(* Find an entry in [protocols] with the given protocol number,
|
|
or raise [Not_found]. *)
|
|
external getservbyname : string -> string -> service_entry
|
|
= "unix_getservbyname"
|
|
(* Find an entry in [services] with the given name, or raise
|
|
[Not_found]. *)
|
|
external getservbyport : int -> string -> service_entry
|
|
= "unix_getservbyport"
|
|
(* Find an entry in [services] with the given service number,
|
|
or raise [Not_found]. *)
|
|
|
|
|
|
(*** Terminal interface *)
|
|
|
|
(* The following functions implement the POSIX standard terminal
|
|
interface. They provide control over asynchronous communication ports
|
|
and pseudo-terminals. Refer to the [termios] man page for a
|
|
complete description. *)
|
|
|
|
type terminal_io = {
|
|
(* Input modes: *)
|
|
mutable c_ignbrk: bool; (* Ignore the break condition. *)
|
|
mutable c_brkint: bool; (* Signal interrupt on break condition. *)
|
|
mutable c_ignpar: bool; (* Ignore characters with parity errors. *)
|
|
mutable c_parmrk: bool; (* Mark parity errors. *)
|
|
mutable c_inpck: bool; (* Enable parity check on input. *)
|
|
mutable c_istrip: bool; (* Strip 8th bit on input characters. *)
|
|
mutable c_inlcr: bool; (* Map NL to CR on input. *)
|
|
mutable c_igncr: bool; (* Ignore CR on input. *)
|
|
mutable c_icrnl: bool; (* Map CR to NL on input. *)
|
|
mutable c_ixon: bool; (* Recognize XON/XOFF characters on input. *)
|
|
mutable c_ixoff: bool; (* Emit XON/XOFF chars to control input flow. *)
|
|
(* Output modes: *)
|
|
mutable c_opost: bool; (* Enable output processing. *)
|
|
(* Control modes: *)
|
|
mutable c_obaud: int; (* Output baud rate (0 means close connection).*)
|
|
mutable c_ibaud: int; (* Input baud rate. *)
|
|
mutable c_csize: int; (* Number of bits per character (5-8). *)
|
|
mutable c_cstopb: int; (* Number of stop bits (1-2). *)
|
|
mutable c_cread: bool; (* Reception is enabled. *)
|
|
mutable c_parenb: bool; (* Enable parity generation and detection. *)
|
|
mutable c_parodd: bool; (* Specify odd parity instead of even. *)
|
|
mutable c_hupcl: bool; (* Hang up on last close. *)
|
|
mutable c_clocal: bool; (* Ignore modem status lines. *)
|
|
(* Local modes: *)
|
|
mutable c_isig: bool; (* Generate signal on INTR, QUIT, SUSP. *)
|
|
mutable c_icanon: bool; (* Enable canonical processing
|
|
(line buffering and editing) *)
|
|
mutable c_noflsh: bool; (* Disable flush after INTR, QUIT, SUSP. *)
|
|
mutable c_echo: bool; (* Echo input characters. *)
|
|
mutable c_echoe: bool; (* Echo ERASE (to erase previous character). *)
|
|
mutable c_echok: bool; (* Echo KILL (to erase the current line). *)
|
|
mutable c_echonl: bool; (* Echo NL even if c_echo is not set. *)
|
|
(* Control characters: *)
|
|
mutable c_vintr: char; (* Interrupt character (usually ctrl-C). *)
|
|
mutable c_vquit: char; (* Quit character (usually ctrl-\). *)
|
|
mutable c_verase: char; (* Erase character (usually DEL or ctrl-H). *)
|
|
mutable c_vkill: char; (* Kill line character (usually ctrl-U). *)
|
|
mutable c_veof: char; (* End-of-file character (usually ctrl-D). *)
|
|
mutable c_veol: char; (* Alternate end-of-line char. (usually none). *)
|
|
mutable c_vmin: int; (* Minimum number of characters to read
|
|
before the read request is satisfied. *)
|
|
mutable c_vtime: int; (* Maximum read wait (in 0.1s units). *)
|
|
mutable c_vstart: char; (* Start character (usually ctrl-Q). *)
|
|
mutable c_vstop: char (* Stop character (usually ctrl-S). *)
|
|
}
|
|
|
|
external tcgetattr: file_descr -> terminal_io = "unix_tcgetattr"
|
|
(* Return the status of the terminal referred to by the given
|
|
file descriptor. *)
|
|
|
|
type setattr_when = TCSANOW | TCSADRAIN | TCSAFLUSH
|
|
|
|
external tcsetattr: file_descr -> setattr_when -> terminal_io -> unit
|
|
= "unix_tcsetattr"
|
|
(* Set the status of the terminal referred to by the given
|
|
file descriptor. The second argument indicates when the
|
|
status change takes place: immediately ([TCSANOW]),
|
|
when all pending output has been transmitted ([TCSADRAIN]),
|
|
or after flushing all input that has been received but not
|
|
read ([TCSAFLUSH]). [TCSADRAIN] is recommended when changing
|
|
the output parameters; [TCSAFLUSH], when changing the input
|
|
parameters. *)
|
|
|
|
external tcsendbreak: file_descr -> int -> unit = "unix_tcsendbreak"
|
|
(* Send a break condition on the given file descriptor.
|
|
The second argument is the duration of the break, in 0.1s units;
|
|
0 means standard duration (0.25s). *)
|
|
|
|
external tcdrain: file_descr -> unit = "unix_tcdrain"
|
|
(* Waits until all output written on the given file descriptor
|
|
has been transmitted. *)
|
|
|
|
type flush_queue = TCIFLUSH | TCOFLUSH | TCIOFLUSH
|
|
|
|
external tcflush: file_descr -> flush_queue -> unit = "unix_tcflush"
|
|
(* Discard data written on the given file descriptor but not yet
|
|
transmitted, or data received but not yet read, depending on the
|
|
second argument: [TCIFLUSH] flushes data received but not read,
|
|
[TCOFLUSH] flushes data written but not transmitted, and
|
|
[TCIOFLUSH] flushes both. *)
|
|
|
|
type flow_action = TCOOFF | TCOON | TCIOFF | TCION
|
|
|
|
external tcflow: file_descr -> flow_action -> unit = "unix_tcflow"
|
|
(* Suspend or restart reception or transmission of data on
|
|
the given file descriptor, depending on the second argument:
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[TCOOFF] suspends output, [TCOON] restarts output,
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[TCIOFF] transmits a STOP character to suspend input,
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and [TCION] transmits a START character to restart input. *)
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external setsid : unit -> int = "unix_setsid"
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(* Put the calling process in a new session and detach it from
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its controlling terminal. *)
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