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Manpage of SIGNAL
SIGNAL
Section: Linux Programmer's Manual (7)
Updated: April 14, 2025
Index
NAME
signal - list of available signals
DESCRIPTION
Linux supports the signals listed below. Several signal numbers
are architecture dependent. First the signals described in POSIX.1.
| Signal | Value | Action | Comment
|
|
|
|
|
| | | or death of controlling process
|
| SIGINT | 2 | A | Interrupt from keyboard
|
| SIGQUIT | 3 | A | Quit from keyboard
|
| SIGILL | 4 | A | Illegal Instruction
|
| SIGFPE | 8 | C | Floating point exception
|
| SIGKILL | 9 | AEF | Kill signal
|
| SIGSEGV | 11 | C | Invalid memory reference
|
| SIGPIPE | 13 | A | Broken pipe: write to pipe with no readers
|
| SIGTERM | 15 | A | Termination signal
|
| SIGUSR1 | 30,10,16 | A | User-defined signal 1
|
| SIGUSR2 | 31,12,17 | A | User-defined signal 2
|
| SIGCHLD | 20,17,18 | B | Child stopped or terminated
|
| SIGCONT | 19,18,25 | | Continue if stopped
|
| SIGSTOP | 17,19,23 | DEF | Stop process
|
| SIGTSTP | 18,20,24 | D | Stop typed at tty
|
| SIGTTIN | 21,21,26 | D | tty input for background process
|
| SIGTTOU | 22,22,27 | D | tty output for background process
|
Next various other signals.
| Signal | Value | Action | Comment
|
|
|
|
|
| SIGIOT | 6 | CG | IOT trap. A synonym for SIGABRT
|
| SIGEMT | 7,-,7 | G |
|
| SIGBUS | 10,7,10 | AG | Bus error
|
| SIGSYS | 12,-,12 | G | Bad argument to routine (SVID)
|
| SIGSTKFLT | -,16,- | AG | Stack fault on coprocessor
|
| SIGURG | 16,23,21 | BG | Urgent condition on socket (4.2 BSD)
|
| SIGIO | 23,29,22 | AG | I/O now possible (4.2 BSD)
|
| SIGPOLL | | AG | A synonym for SIGIO (System V)
|
| SIGCLD | -,-,18 | G | A synonym for SIGCHLD
|
| SIGXCPU | 24,24,30 | AG | CPU time limit exceeded (4.2 BSD)
|
| SIGXFSZ | 25,25,31 | AG | File size limit exceeded (4.2 BSD)
|
| SIGVTALRM | 26,26,28 | AG | Virtual alarm clock (4.2 BSD)
|
| SIGPROF | 27,27,29 | AG | Profile alarm clock
|
| SIGPWR | 29,30,19 | AG | Power failure (System V)
|
| SIGINFO | 29,-,- | G | A synonym for SIGPWR
|
| SIGLOST | -,-,- | AG | File lock lost
|
| SIGWINCH | 28,28,20 | BG | Window resize signal (4.3 BSD, Sun)
|
| SIGUNUSED | -,31,- | AG | Unused signal
|
(Here - denotes that a signal is absent; there where three values
are given, the first one is usually valid for alpha and sparc,
the middle one for i386 and ppc, the last one for mips. Signal 29
is SIGINFO / SIGPWR on an alpha but SIGLOST on a sparc.)
The letters in the "Action" column have the following meanings:
- A
-
Default action is to terminate the process.
- B
-
Default action is to ignore the signal.
- C
-
Default action is to dump core.
- D
-
Default action is to stop the process.
- E
-
Signal cannot be caught.
- F
-
Signal cannot be ignored.
- G
-
Not a POSIX.1 conformant signal.
CONFORMING TO
POSIX.1
BUGS
SIGIO and SIGLOST have the same value.
The latter is commented out in the kernel source, but
the build process of some software still thinks that
signal 29 is SIGLOST.
SEE ALSO
Index
- NAME
-
- DESCRIPTION
-
- CONFORMING TO
-
- BUGS
-
- SEE ALSO
-
This document was created by
using the manual pages.
Time: 12:14:03 GMT, March 24, 2025
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