Enum Signal 

#[repr(C)]
pub enum Signal {
    Abort = 1,
    Alarm = 2,
    Bus = 3,
    Cont = 4,
    Ill = 5,
    Io = 6,
    Pipe = 7,
    Poll = 8,
    Term = 9,
    Trap = 10,
    Usr1 = 11,
    Usr2 = 12,
}

Sentry signals definition. Most of them are aligned on standard POSIX signals

Variants

Abort = 1

Abort signal

Alarm = 2

Timer (from alarm)

Bus = 3

Bus error (bad memory access, memory required)

Cont = 4

Continue if previously stopped

Ill = 5

Illegal instruction. Can be also used for upper provtocols

Io = 6

I/O now ready

Pipe = 7

Broken pipe

Poll = 8

Event pollable

Term = 9

Termination signal

Trap = 10

Trace/bp signal (debug usage only)

Usr1 = 11

1st user-defined signal

Usr2 = 12

2nd user-defined signal