Signals

Signals Referenced in RubyTapas

• SIGEXIT — “EXIT”=>0  — exit with a return value
• SIGHUP — “HUP”=>1  —  Hangup detected on controlling terminal or death of controlling process
  • Episode #353: Trap
• SIGINT — “INT”=>2  —  Interrupt from keyboard
  • Episode #353: Trap
  • Episode #354: Advanced Trap
  • Episode #367: Logs And Signals
• SIGQUIT — “QUIT”=>3  —  Quit from keyboard
  • Episode #353: Trap
• SIGILL — “ILL”=>4  — Illegal Instruction
• SIGTRAP — “TRAP”=>5  — Trace/breakpoint trap
• SIGIOT — “IOT”=>6  — Generated by the PDP-11 “iot” instruction.  Same as “Abort”.
• SIGABRT — “ABRT”=>6  — Abort signal. (as by the process itself when it calls abort function.)
• SIGBUS — “BUS”=>7  — Bus error; bad memory access
• SIGFPE — “FPE”=>8  — Floating point exception
• SIGKILL — “KILL”=>9  — Kill signal; CANNOT be caught or ignored, NO cleanup in process
  • Episode #353: Trap
• SIGUSR1 — “USR1″=>10  — User-defined signal 1
  • Episode #367: Logs And Signals
  • Episode #457: Subprocesses Part 9: Exec
• SIGSEGV — “SEGV”=>11  — Invalid memory reference; segment violation.
  • Episode #353: Trap
• SIGUSR2 — “USR2″=>12  — User-defined signal 2
  • Episode #367: Logs And Signals
• SIGPIPE — “PIPE”=>13  — Broken pipe: write to pipe with no readers
• SIGALRM — “ALRM”=>14  — Timer signal from alarm; sent when real or clock time elapses
• SIGTERM — “TERM”=>15  — Termination signal; can be caught and interpreted or ignored by the process
  • Episode #353: Trap
  • Episode #367: Logs And Signals
• SIGCHLD — “CHLD”=>17  — Child stopped or terminated
  • Episode #423: Subprocesses Part 5: SIGCHLD
• SIGCLD — “CLD”=>17  — A synonym for SIGCHLD
• SIGCONT — “CONT”=>18  — Continue if stopped
• SIGSTOP — “STOP”=>19  — Stop process
• SIGTSTP — “TSTP”=>20  — Stop typed at terminal
• SIGTTIN — “TTIN”=>21  — Terminal input for background process
• SIGTTOU — “TTOU”=>22  — Terminal output for background process
• SIGURG — “URG”=>23  — Urgent condition on socket
• SIGXCPU — “XCPU”=>24  — CPU time limit exceeded
  • Episode #426: Subprocesses Part 7: Soft Limits
• SIGXFSZ — “XFSZ”=>25  — file size limit exceeded
• SIGVTALRM — “VTALRM”=>26  — sent when CPU time used by the process elapses
• SIGPROF — “PROF”=>27  — sent when CPU time used by the process, and by the system on behalf of the process, elapses
• SIGWINCH — “WINCH”=>28  — window resize signal
  • Episode #356: Dynamic Word Wrap
• SIGIO — “IO”=>29  — I/O now possible
• SIGPOLL — “POLL”=>29  — Pollable event; Synonym for SIGIO
• SIGPWR — “PWR”=>30  — Power failure
• SIGSYS — “SYS”=>31  — Bad system call