shell v0.14.0 · OCaml Package

Extensions to Core.Unix.

val fork_exec : 
  ?stdin:Core.Unix.File_descr.t ->
  ?stdout:Core.Unix.File_descr.t ->
  ?stderr:Core.Unix.File_descr.t ->
  ?path_lookup:bool ->
  ?env:
    [ `Extend of (string * string) list | `Replace of (string * string) list ] ->
  ?working_dir:string ->
  ?setuid:int ->
  ?setgid:int ->
  string ->
  string list ->
  Core.Pid.t

fork_exec prog args ~stdin ~stdout ~stderr ~setuid ~setgid forks a new process that executes the program in file prog, with arguments args. The pid of the new process is returned immediately; the new process executes concurrently with the current process.

The function raises EPERM if when using set{gid,uid} and the user id is not 0.

The standard input and outputs of the new process are connected to the descriptors stdin, stdout and stderr.

The close_on_exec flag is cleared from stderr stdout and stdin so it's safe to pass in fds with close_on_exec set.

parameter path_lookup
if true than we use PATH to find the process to exec. @env specifies the environment the process runs in
ERRORS: Unix.unix_error. This function should not raise EINTR; it will restart itself automatically.
RATIONAL: setuid and setgid do not do a full id drop (e.g.: they save the id in saved id) when the user does not have the privileges required to setuid to anyone.
By default all file descriptors should be set_closexec ASAP after being open to avoid being captured in parallel execution of fork_exec; resetting the closexec flag on the forked flag is a cleaner and more thread safe approach.
BUGS: The capabilities for setuid in linux are not tied to the uid 0 (man 7 capabilities). It is still fair to assume that under most system this capability is there IFF uid == 0. A more fine grain permissionning approach would make this function non-portable and be hard to implement in an async-signal-way.
Because this function keeps the lock for most of its lifespan and restarts automatically on EINTR it might prevent the OCaml signal handlers to run in that thread.

val seteuid : int -> unit

val setreuid : uid:int -> euid:int -> unit

val ntohl : Core.Int32.t -> Core.Int32.t

Network to host order long, like C.

val htonl : Core.Int32.t -> Core.Int32.t

Host to network order long, like C.

type statvfs = {

bsize : int;
(*
file system block size
*)
frsize : int;
(*
fragment size
*)
blocks : int;
(*
size of fs in frsize units
*)
bfree : int;
(*
# free blocks
*)
bavail : int;
(*
# free blocks for non-root
*)
files : int;
(*
# inodes
*)
ffree : int;
(*
# free inodes
*)
favail : int;
(*
# free inodes for non-root
*)
fsid : int;
(*
file system ID
*)
flag : int;
(*
mount flags
*)
namemax : int;
(*
maximum filename length
*)

}

val sexp_of_statvfs : statvfs -> Ppx_sexp_conv_lib.Sexp.t

val statvfs_of_sexp : Ppx_sexp_conv_lib.Sexp.t -> statvfs

val bin_shape_statvfs : Core.Bin_prot.Shape.t

val bin_size_statvfs : statvfs Core.Bin_prot.Size.sizer

val bin_write_statvfs : statvfs Core.Bin_prot.Write.writer

val bin_writer_statvfs : statvfs Core.Bin_prot.Type_class.writer

val bin_read_statvfs : statvfs Core.Bin_prot.Read.reader

val __bin_read_statvfs__ : (int -> statvfs) Core.Bin_prot.Read.reader

val bin_reader_statvfs : statvfs Core.Bin_prot.Type_class.reader

val bin_statvfs : statvfs Core.Bin_prot.Type_class.t

val statvfs : string -> statvfs

get file system statistics

val getloadavg : unit -> float * float * float

get load averages

module Extended_passwd : sig ... end

val strptime : fmt:string -> string -> Core.Unix.tm

deprecated [since 2019-07] use Core.Unix.strptime

The CIDR module moved into Core.Unix

module Inet_port : sig ... end

Simple int wrapper to be explicit about ports.

module Mac_address : sig ... end

module Quota : sig ... end

module Mount_entry : sig ... end

val terminal_width : int Core.Lazy.t

package shell