Signal

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type t

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val equal : t -> t -> bool

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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.

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val to_system_int : t -> int

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val of_caml_int : int -> t

of_caml_int constructs a Signal.t given an O'Caml internal signal number. This is only for the use of the Core_unix module.

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val to_caml_int : t -> int

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val to_string : t -> string

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

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type sys_behavior = [

| `Continue

| `Dump_core

| `Ignore

| `Stop

| `Terminate

]

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).

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val default_sys_behavior : t -> sys_behavior

default_sys_behavior t Query the default system behavior for a signal.

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val handle_default : t -> unit

handle_default t is set t `Default.

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val ignore : t -> unit

ignore t is set t `Ignore.

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type pid_spec = [

| `Pid of Core_kernel.Std.Pid.t

| `My_group

| `Group of Core_kernel.Std.Pid.t

]

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val send : t -> pid_spec -> [

| `Ok

| `No_such_process

]

send signal pid sends signal to the process whose process id is pid.

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val send_i : t -> pid_spec -> unit

send_i signal ~pid sends signal to the process whose process id is pid. No exception will be raised if pid is a zombie or nonexistent.

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val send_exn : t -> pid_spec -> unit

send_exn signal ~pid sends signal to the process whose process id is pid. In Caml's standard library, this is called Unix.kill. Sending a signal to a zombie and/or nonexistent process will raise an exception.

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val can_send_to : Core_kernel.Std.Pid.t -> bool

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

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type sigprocmask_command = [

| `Set

| `Block

| `Unblock

]

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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.

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val sigpending : unit -> t list

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

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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.

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val abrt : t

Dump_core Abnormal termination

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val alrm : t

Terminate Timeout

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val chld : t

Ignore Child process terminated

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val cont : t

Continue Continue

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val fpe : t

Dump_core Arithmetic exception

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val hup : t

Terminate Hangup on controlling terminal

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val ill : t

Dump_core Invalid hardware instruction

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val int : t

Terminate Interactive interrupt (ctrl-C)

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val kill : t

Terminate Termination (cannot be ignored)

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val pipe : t

Terminate Broken pipe

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val prof : t

Terminate Profiling interrupt

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val quit : t

Dump_core Interactive termination

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val segv : t

Dump_core Invalid memory reference

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val stop : t

Stop Stop

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val term : t

Terminate Termination

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val tstp : t

Stop Interactive stop

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val ttin : t

Stop Terminal read from background process

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val ttou : t

Stop Terminal write from background process

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val usr1 : t

Terminate Application-defined signal 1

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val usr2 : t

Terminate Application-defined signal 2

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val vtalrm : t

Terminate Timeout in virtual time

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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

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module Expert : sig

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

An OCaml signal handler can run at any time, which introduces all the semantic complexities of multithreading. It is much easier to use Async's signal handling, see [root:Async_unix].Signal, which does not involve multithreading, and runs user code as ordinary Async jobs. Also, beware that there can only be a single OCaml signal handler for any signal, so handling a signal with a Core signal handler will interfere if Async is attempting to handle the same signal.

All signal handler functions are called with Exn.handle_uncaught_and_exit, to prevent the signal handler from raising, because raising from a signal handler could raise to any allocation or GC point in any thread, which would be impossible to reason about.

If you do use Core signal handlers, you should strive to make the signal handler perform a simple idempotent action, like setting a ref.

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type behavior = [

| `Default

| `Ignore

| `Handle of t -> unit

]

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val signal : t -> behavior -> behavior

signal t sets the behavior of the system on receipt of signal t and returns the behavior previously associated with t. If t is not available on your system, signal raises.

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val set : t -> behavior -> unit

set t b is ignore (signal t b)

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val handle : t -> (t -> unit) -> unit

handle t f is set t (`Handle f).

end

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val t_of_sexp : Sexplib.Sexp.t -> t

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val sexp_of_t : t -> Sexplib.Sexp.t

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val bin_t : t Core_kernel.Std.Bin_prot.Type_class.t

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val bin_read_t : t Core_kernel.Std.Bin_prot.Read.reader

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val __bin_read_t__ : (int -> t) Core_kernel.Std.Bin_prot.Read.reader

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val bin_reader_t : t Core_kernel.Std.Bin_prot.Type_class.reader

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val bin_size_t : t Core_kernel.Std.Bin_prot.Size.sizer

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val bin_write_t : t Core_kernel.Std.Bin_prot.Write.writer

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val bin_writer_t : t Core_kernel.Std.Bin_prot.Type_class.writer

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val sys_behavior_of_sexp : Sexplib.Sexp.t -> sys_behavior

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val __sys_behavior_of_sexp__ : Sexplib.Sexp.t -> sys_behavior

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val sexp_of_sys_behavior : sys_behavior -> Sexplib.Sexp.t

module Signal