| Signal | Value | Description |
|---|---|---|
| SIGHUP | 1 | Hangup (POSIX) Report that user's terminal is disconnected. Signal used to report the termination of the controlling process. |
| SIGINT | 2 | Interrupt (ANSI) Program interrupt. (ctrl-c) |
| SIGQUIT | 3 | Quit (POSIX) Terminate process and generate core dump. |
| SIGILL | 4 | Illegal Instruction (ANSI) Generally indicates that the executable file is corrupted or use of data where a pointer to a function was expected. |
| SIGTRAP | 5 | Trace trap (POSIX) |
| SIGABRT SIGIOT |
6 | Abort (ANSI) IOT trap (4.2 BSD) Process detects error and reports by calling abort |
| SIGBUS | 7 | BUS error (4.2 BSD) Indicates an access to an invalid address. |
| SIGFPE | 8 | Floating-Point arithmetic Exception (ANSI). This includes division by zero and overflow.The IEEE Standard for Binary Floating-Point Arithmetic (ANSI/IEEE Std 754-1985) defines various floating-point exceptions. |
| SIGKILL | 9 | Kill, unblockable (POSIX) Cause immediate program termination. Can not be handled, blocked or ignored. |
| SIGUSR1 | 10 | User-defined signal 1 |
| SIGSEGV | 11 | Segmentation Violation (ANSI) Occurs when a program tries to read or write outside the memory that is allocated for it by the operating system, dereferencing a bad or NULL pointer. Indicates an invalid access to valid memory. |
| SIGUSR2 | 12 | User-defined signal 2 |
| SIGPIPE | 13 | Broken pipe (POSIX) Error condition like trying to write to a socket which is not connected. |
| SIGALRM | 14 | Alarm clock (POSIX) Indicates expiration of a timer. Used by the alarm() function. |
| SIGTERM | 15 | Termination (ANSI) This signal can be blocked, handled, and ignored. Generated by "kill" command. |
| SIGSTKFLT | 16 | Stack fault |
| SIGCHLD SIGCLD |
17 | Child status has changed (POSIX) Signal sent to parent process whenever one of its child processes terminates or stops. See the YoLinux.com Fork, exec, wait, waitpid tutorial |
| SIGCONT | 18 | Continue (POSIX) Signal sent to process to make it continue. |
| SIGSTOP | 19 | Stop, unblockable (POSIX) Stop a process. This signal cannot be handled, ignored, or blocked. |
| SIGTSTP | 20 | Keyboard stop (POSIX) Interactive stop signal. This signal can be handled and ignored. (ctrl-z) |
| SIGTTIN | 21 | Background read from tty (POSIX) |
| SIGTTOU | 22 | Background write to tty (POSIX) |
| SIGURG | 23 | Urgent condition on socket (4.2 BSD) Signal sent when "urgent" or out-of-band data arrives on a socket. |
| SIGXCPU | 24 | CPU limit exceeded (4.2 BSD) |
| SIGXFSZ | 25 | File size limit exceeded (4.2 BSD) |
| SIGVTALRM | 26 | Virtual Time Alarm (4.2 BSD) Indicates expiration of a timer. |
| SIGPROF | 27 | Profiling alarm clock (4.2 BSD) Indicates expiration of a timer. Use for code profiling facilities. |
| SIGWINCH | 28 | Window size change (4.3 BSD, Sun) |
| SIGIO SIGPOLL |
29 | I/O now possible (4.2 BSD) Pollable event occurred (System V) Signal sent when file descriptor is ready to perform I/O (generated by sockets) |
| SIGPWR | 30 | Power failure restart (System V) |
| SIGSYS | 31 |
Bad system call |
See: /usr/include/bits/signum.h
from: http://www.yolinux.com/TUTORIALS/C++Signals.html