Module Core.Signal

Signal handlers.

type t
include Bin_prot.Binable.S with type t := t
include Bin_prot.Binable.S_only_functions with type t := t
val bin_size_t : t Bin_prot.Size.sizer
val bin_write_t : t Bin_prot.Write.writer
val bin_read_t : t Bin_prot.Read.reader
val __bin_read_t__ : (int -> t) Bin_prot.Read.reader

This function only needs implementation if t exposed to be a polymorphic variant. Despite what the type reads, this does *not* produce a function after reading; instead it takes the constructor tag (int) before reading and reads the rest of the variant t afterwards.

val bin_shape_t : Bin_prot.Shape.t
val bin_writer_t : t Bin_prot.Type_class.writer
val bin_reader_t : t Bin_prot.Type_class.reader
include Ppx_sexp_conv_lib.Sexpable.S with type t := t
val t_of_sexp : Sexplib0.Sexp.t -> t
val sexp_of_t : t -> Sexplib0.Sexp.t
include Core_kernel.Comparable.S with type t := t
include Base.Comparable.S with type t := t
include Base.Comparisons.Infix with type t := t
val (>=) : t -> t -> bool
val (<=) : t -> t -> bool
val (=) : t -> t -> bool
val (>) : t -> t -> bool
val (<) : t -> t -> bool
val (<>) : t -> t -> bool
val equal : t -> t -> bool
val compare : t -> t -> int

compare t1 t2 returns 0 if t1 is equal to t2, a negative integer if t1 is less than t2, and a positive integer if t1 is greater than t2.

val min : t -> t -> t
val max : t -> t -> t
val ascending : t -> t -> int

ascending is identical to compare. descending x y = ascending y x. These are intended to be mnemonic when used like List.sort ~compare:ascending and List.sort ~cmp:descending, since they cause the list to be sorted in ascending or descending order, respectively.

val descending : t -> t -> int
val between : t -> low:t -> high:t -> bool

between t ~low ~high means low <= t <= high

val clamp_exn : t -> min:t -> max:t -> t

clamp_exn t ~min ~max returns t', the closest value to t such that between t' ~low:min ~high:max is true.

Raises if not (min <= max).

val clamp : t -> min:t -> max:t -> t Base.Or_error.t
include Base.Comparator.S with type t := t
type comparator_witness
val validate_lbound : min:t Base.Maybe_bound.t -> t Base.Validate.check
val validate_ubound : max:t Base.Maybe_bound.t -> t Base.Validate.check
val validate_bound : min:t Base.Maybe_bound.t -> max:t Base.Maybe_bound.t -> t Base.Validate.check
module Replace_polymorphic_compare : sig ... end
include Core_kernel.Hashable.S with type t := t
include Core_kernel.Hashable.Common with type t := t
val compare : t -> t -> Base.Int.t
val hash_fold_t : Base.Hash.state -> t -> Base.Hash.state
val hash : t -> Base.Hash.hash_value
module Table : Core_kernel.Hashtbl.S with type key = t
module Hash_set : Core_kernel.Hash_set.S with type elt = t
include Base.Stringable.S with type t := t
val of_string : string -> t
val to_string : t -> string
val equal : t -> t -> bool
val of_system_int : int -> t

of_system_int and to_system_int return and take respectively a signal number corresponding to those in the system's /usr/include/bits/signum.h (or equivalent). It is not guaranteed that these numbers are portable across any given pair of systems -- although some are defined as standard by POSIX.

val to_system_int : t -> int
val of_caml_int : int -> t

of_caml_int constructs a Signal.t given an OCaml internal signal number. This is only for the use of the Core_unix module.

val to_caml_int : t -> int
val to_string : t -> string

to_string t returns a human-readable name: "sigabrt", "sigalrm", ...

type sys_behavior = [
| `Continue

Continue the process if it is currently stopped

| `Dump_core

Terminate the process and dump core

| `Ignore

Ignore the signal

| `Stop

Stop the process

| `Terminate

Terminate the process

]

The default behaviour of the system if these signals trickle to the top level of a program. See include/linux/kernel.h in the Linux kernel source tree (not the file /usr/include/linux/kernel.h).

val sexp_of_sys_behavior : sys_behavior -> Ppx_sexp_conv_lib.Sexp.t
val sys_behavior_of_sexp : Ppx_sexp_conv_lib.Sexp.t -> sys_behavior
val __sys_behavior_of_sexp__ : Ppx_sexp_conv_lib.Sexp.t -> sys_behavior
val default_sys_behavior : t -> sys_behavior

Queries the default system behavior for a signal.

val handle_default : t -> unit

handle_default t is set t `Default.

val ignore : t -> unit

ignore t is set t `Ignore.

type pid_spec = [
| `Pid of Core_kernel.Pid.t
| `My_group
| `Group of Core_kernel.Pid.t
]
val sexp_of_pid_spec : pid_spec -> Ppx_sexp_conv_lib.Sexp.t
val send : t -> pid_spec -> [ `Ok | `No_such_process ]

send signal pid_spec sends signal to the processes specified by pid_spec.

send_i is like send, except that it silently returns if the specified processes don't exist.

send_exn is like send, except that it raises if the specified processes don't exist.

All of send, send_i, and send_exn raise if you don't have permission to send the signal to the specified processes or if signal is unknown.

val send_i : t -> pid_spec -> unit
val send_exn : t -> pid_spec -> unit
val can_send_to : Core_kernel.Pid.t -> bool

can_send_to pid returns true if pid is running and the current process has permission to send it signals.

type sigprocmask_command = [
| `Set
| `Block
| `Unblock
]
val sigprocmask : sigprocmask_command -> t list -> t list

sigprocmask cmd sigs changes the set of blocked signals.

  • If cmd is `Set, blocked signals are set to those in the list sigs.
  • If cmd is `Block, the signals in sigs are added to the set of blocked signals.
  • If cmd is `Unblock, the signals in sigs are removed from the set of blocked signals.

sigprocmask returns the set of previously blocked signals.

val sigpending : unit -> t list

sigpending () returns the set of blocked signals that are currently pending.

val sigsuspend : t list -> unit

sigsuspend sigs atomically sets the blocked signals to sigs and waits for * a non-ignored, non-blocked signal to be delivered. On return, the blocked * signals are reset to their initial value.

val abrt : t

Dump_core Abnormal termination

val alrm : t

Terminate Timeout

val bus : t

Dump_core Bus error

val chld : t

Ignore Child process terminated

val cont : t

Continue Continue

val fpe : t

Dump_core Arithmetic exception

val hup : t

Terminate Hangup on controlling terminal

val ill : t

Dump_core Invalid hardware instruction

val int : t

Terminate Interactive interrupt (ctrl-C)

val kill : t

Terminate Termination (cannot be ignored)

val pipe : t

Terminate Broken pipe

val poll : t

Terminate Pollable event

val prof : t

Terminate Profiling interrupt

val quit : t

Dump_core Interactive termination

val segv : t

Dump_core Invalid memory reference

val sys : t

Dump_core Bad argument to routine

val stop : t

Stop Stop

val term : t

Terminate Termination

val trap : t

Dump_core Trace/breakpoint trap

val tstp : t

Stop Interactive stop

val ttin : t

Stop Terminal read from background process

val ttou : t

Stop Terminal write from background process

val urg : t

Ignore Urgent condition on socket

val usr1 : t

Terminate Application-defined signal 1

val usr2 : t

Terminate Application-defined signal 2

val vtalrm : t

Terminate Timeout in virtual time

val xcpu : t

Dump_core Timeout in cpu time

val xfsz : t

Dump_core File size limit exceeded

val zero : t

Ignore No-op; can be used to test whether the target process exists and the current process has permission to signal it

module Expert : sig ... end

The Expert module contains functions that novice users should avoid, due to their complexity.

module Stable : sig ... end