Linux Signal Table

These are the signal numbers and their corresponding symbolic names.

While some architectures/ABIs have different number<->symbol mappings, they're equivalent on x86 (32-bit & 64-bit) and arm (32-bit & 64-bit).

For more details on signals in general, see the signal(7) man page.

Real-time Signals

The SIGRTMIN & SIGRTMAX values listed below are technically dynamic. Implementations (e.g. glibc) are allowed to reserve things internally from the user's program. The constants listed below reflect the most common scenarios people see, especially since real-time signal usage is not that common. Keep this in mind if you see signal usage in that range.

For more in-depth details, see the Real-time signals chapter in the signal(7) man page.

Table

number	hex	symbol	description
1	0x01	SIGHUP	Hangup
2	0x02	SIGINT	Interrupt
3	0x03	SIGQUIT	Quit
4	0x04	SIGILL	Illegal instruction
5	0x05	SIGTRAP	Trace/breakpoint trap
6	0x06	SIGABRT	Aborted
6	0x06	SIGIOT	(Same value as SIGABRT) Aborted
7	0x07	SIGBUS	Bus error
8	0x08	SIGFPE	Floating point exception
9	0x09	SIGKILL	Killed
10	0x0a	SIGUSR1	User defined signal 1
11	0x0b	SIGSEGV	Segmentation fault
12	0x0c	SIGUSR2	User defined signal 2
13	0x0d	SIGPIPE	Broken pipe
14	0x0e	SIGALRM	Alarm clock
15	0x0f	SIGTERM	Terminated
16	0x10	SIGSTKFLT	Stack fault
17	0x11	SIGCHLD	Child exited
17	0x11	SIGCLD	(Same value as SIGCHLD) Child exited
18	0x12	SIGCONT	Continued
19	0x13	SIGSTOP	Stopped (signal)
20	0x14	SIGTSTP	Stopped
21	0x15	SIGTTIN	Stopped (tty input)
22	0x16	SIGTTOU	Stopped (tty output)
23	0x17	SIGURG	Urgent I/O condition
24	0x18	SIGXCPU	CPU time limit exceeded
25	0x19	SIGXFSZ	File size limit exceeded
26	0x1a	SIGVTALRM	Virtual timer expired
27	0x1b	SIGPROF	Profiling timer expired
28	0x1c	SIGWINCH	Window changed
29	0x1d	SIGPOLL	I/O possible
29	0x1d	SIGIO	(Same value as SIGPOLL) I/O possible
30	0x1e	SIGPWR	Power failure
31	0x1f	SIGSYS	Bad system call
32	0x20	SIGRTMIN-2	Real-time signal reserved by the C library for NPTL; see signal(7)
33	0x21	SIGRTMIN-1	Real-time signal reserved by the C library for NPTL; see signal(7)
34	0x22	SIGRTMIN	Real-time signal 0
35	0x23	SIGRTMIN+1	Real-time signal 1
36	0x24	SIGRTMIN+2	Real-time signal 2
37	0x25	SIGRTMIN+3	Real-time signal 3
38	0x26	SIGRTMIN+4	Real-time signal 4
39	0x27	SIGRTMIN+5	Real-time signal 5
40	0x28	SIGRTMIN+6	Real-time signal 6
41	0x29	SIGRTMIN+7	Real-time signal 7
42	0x2a	SIGRTMIN+8	Real-time signal 8
43	0x2b	SIGRTMIN+9	Real-time signal 9
44	0x2c	SIGRTMIN+10	Real-time signal 10
45	0x2d	SIGRTMIN+11	Real-time signal 11
46	0x2e	SIGRTMIN+12	Real-time signal 12
47	0x2f	SIGRTMIN+13	Real-time signal 13
48	0x30	SIGRTMIN+14	Real-time signal 14
49	0x31	SIGRTMIN+15	Real-time signal 15
50	0x32	SIGRTMAX-14	Real-time signal 16
51	0x33	SIGRTMAX-13	Real-time signal 17
52	0x34	SIGRTMAX-12	Real-time signal 18
53	0x35	SIGRTMAX-11	Real-time signal 19
54	0x36	SIGRTMAX-10	Real-time signal 20
55	0x37	SIGRTMAX-9	Real-time signal 21
56	0x38	SIGRTMAX-8	Real-time signal 22
57	0x39	SIGRTMAX-7	Real-time signal 23
58	0x3a	SIGRTMAX-6	Real-time signal 24
59	0x3b	SIGRTMAX-5	Real-time signal 25
60	0x3c	SIGRTMAX-4	Real-time signal 26
61	0x3d	SIGRTMAX-3	Real-time signal 27
62	0x3e	SIGRTMAX-2	Real-time signal 28
63	0x3f	SIGRTMAX-1	Real-time signal 29
64	0x40	SIGRTMAX	Real-time signal 30