Signal name | Value | Action | Comment |
SIGINT | 2 | A | Interrupt from keyboard |
SIGQUIT | 3 | A | Quit from keyboard |
SIGILL | 4 | A | Illegal Instruction |
SIGTRAP | 5 | CG | Trace/breakpoint trap |
SIGABRT | 6 | C | Abort |
SIGUNUSED | 7 | AG | Unused signal |
SIGFPE | 8 | C | Floating point exception |
SIGKILL | 9 | AEF | Termination signal |
SIGUSR1 | 10 | A | User-defined signal 1 |
SIGSEGV | 11 | C | Invalid memory reference |
SIGUSR2 | 12 | A | User-defined signal 2 |
SIGPIPE | 13 | A | Write to pipe with no readers |
SIGALRM | 14 | A | Timer signal from alarm(1). |
SIGTERM | 15 | A | Termination signal |
SIGSTKFLT | 16 | AG | Stack fault on coprocessor |
SIGCHLD | 17 | B | Child terminated |
SIGCONT | 18 | Continue if stopped | |
SIGTSTOP | 19 | DEF | Stop process |
SIGTSTP | 20 | D | Stop typed at tty |
SIGTTIN | 21 | D | tty input for background process |
SIGTTOU | 22 | D | tty output for background process |
SIGIO | 23 | AG | I/O error |
SIGXCPU | 24 | AG | CPU time limit exceeded |
SIGXFSZ | 25 | AG | File size limit exceeded |
SIGVTALRM | 26 | AG | Virtual time alarm (???) |
SIGPROF | 27 | AG | Profile signal |
SIGWINCH | 29 | BG | Window resize signal |
The letters in the "Action" column have the following meanings: