enum Signal
Overview
This module provides a way to handle OS signals passed to the process.
puts "Ctrl+C still has the OS default action (stops the program)"
sleep 3
Signal::INT.trap do
puts "Gotcha!"
end
puts "Ctrl+C will be caught from now on"
sleep 3
Signal::INT.reset
puts "Ctrl+C is back to the OS default action"
sleep 3Note:
- Signals are processed through the event loop and run in their own Fiber.
- Signals may be lost if the event loop doesn't run before exit.
- An uncaught exception in a signal handler is a fatal error.
Defined in:
signal.crsignal.cr
Enum Members
-
HUP =
1 -
INT =
2 -
QUIT =
3 -
ILL =
4 -
TRAP =
5 -
IOT =
6 -
ABRT =
6 -
FPE =
8 -
KILL =
9 -
BUS =
7 -
SEGV =
11 -
SYS =
31 -
PIPE =
13 -
ALRM =
14 -
TERM =
15 -
URG =
23 -
STOP =
19 -
TSTP =
20 -
CONT =
18 -
CHLD =
17 -
TTIN =
21 -
TTOU =
22 -
IO =
29 -
XCPU =
24 -
XFSZ =
25 -
VTALRM =
26 -
USR1 =
10 -
USR2 =
12 -
WINCH =
28 -
PWR =
30 -
STKFLT =
16 -
UNUSED =
31
Instance Method Summary
- #abrt?
- #alrm?
- #bus?
- #chld?
- #cont?
- #fpe?
- #hup?
-
#ignore
Clears the handler for this signal and prevents the OS default action.
- #ill?
- #int?
- #io?
- #iot?
- #kill?
- #pipe?
- #pwr?
- #quit?
-
#reset
Resets the handler for this signal to the OS default.
- #segv?
- #stkflt?
- #stop?
- #sys?
- #term?
-
#trap(&block : Signal -> )
Sets the handler for this signal to the passed function.
-
#trap(block : Signal -> )
Sets the handler for this signal to the passed function.
- #trap?
- #tstp?
- #ttin?
- #ttou?
- #unused?
- #urg?
- #usr1?
- #usr2?
- #vtalrm?
- #winch?
- #xcpu?
- #xfsz?
Instance methods inherited from struct Enum
&(other : self)
&,
+(other : Int)
+,
-(other : Int)
-,
<=>(other : self)
<=>,
==(other : self)
==,
^(other : self)
^,
clone
clone,
each(&block)
each,
hash
hash,
includes?(other : self)
includes?,
to_f32 : Float32
to_f32,
to_f64 : Float64
to_f64,
to_i : Int32
to_i,
to_i16 : Int16
to_i16,
to_i32 : Int32
to_i32,
to_i64 : Int64
to_i64,
to_i8 : Int8
to_i8,
to_json(json : JSON::Builder)
to_json,
to_s(io : IO) : Nilto_s : String to_s, to_u16 : UInt16 to_u16, to_u32 : UInt32 to_u32, to_u64 : UInt64 to_u64, to_u8 : UInt8 to_u8, to_yaml(yaml : YAML::Builder) to_yaml, |(other : self) |, ~ ~
Constructor methods inherited from struct Enum
from_value(value) : self
from_value,
from_value?(value) : self?
from_value?,
new(pull : JSON::PullParser)new(pull : YAML::PullParser) new, parse(string) : self parse, parse?(string) : self? parse?
Class methods inherited from struct Enum
each(&block)
each,
names : Array(String)
names,
values : Array(self)
values
Instance methods inherited from module Comparable(self)
<(other : T)
<,
<=(other : T)
<=,
<=>(other : T)
<=>,
==(other : T)
==,
>(other : T)
>,
>=(other : T)
>=
Instance methods inherited from struct Value
==(other)
==,
dup
dup
Instance methods inherited from class Object
!=(other)
!=,
!~(other)
!~,
==(other)
==,
===(other : JSON::Any)===(other : YAML::Any)
===(other) ===, =~(other) =~, class class, dup dup, hash hash, inspect(io : IO)
inspect inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s
to_s(io : IO) to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as
Constructor methods inherited from class Object
from_json(string_or_io, root : String) : selffrom_json(string_or_io) : self from_json, from_yaml(string_or_io) : self from_yaml
Instance Method Detail
Sets the handler for this signal to the passed function.
After executing this, whenever the current process receives the corresponding signal, the passed function will be run (instead of the OS default).
Sets the handler for this signal to the passed function.
After executing this, whenever the current process receives the corresponding signal, the passed function will be run (instead of the OS default).