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The Signal Belfry

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This ordering is a page

Sorted by rarity

The same bells, from most forgotten to most common.

26 bells on this page

  1. SIG-013 SIGILL Illegal instruction: the CPU read something it doesn't recognize as an order. Program faults forgotten
  2. SIG-015 SIGTRAP The debugger's bell: every breakpoint is a pre-arranged ring. Program faults forgotten
  3. SIG-016 SIGSYS A forbidden system call — nowadays it's seccomp that rings it. Program faults forgotten
  4. SIG-018 SIGVTALRM The alarm clock that only counts the time the process spent on the CPU. Clocks forgotten
  5. SIG-019 SIGPROF The profilers' metronome: a steady tick in CPU time, user plus system. Clocks forgotten
  6. SIG-021 SIGXCPU The CPU limit burst — a warning before the final cut. Resources forgotten
  7. SIG-022 SIGXFSZ The file grew past its allowance; the bell rings at the write. Resources forgotten
  8. SIG-024 SIGUSR2 The second free bell — the one that usually remains without an agreed ring. The user's forgotten
  9. SIG-026 SIGINFO Ctrl+T on the BSDs and macOS: it tells you what the process is doing, interrupting nothing. The user's forgotten
  10. SIG-003 SIGQUIT Ctrl+\ — ends things like its sibling, but leaves a core dump as a keepsake. Termination uncommon
  11. SIG-006 SIGSTOP Freezes the process wherever it stands — and takes no refusal. Stop and resume uncommon
  12. SIG-008 SIGCONT The resume ring: it wakes whatever was frozen. Stop and resume uncommon
  13. SIG-009 SIGCHLD A child has finished — the one notice parents may ignore guilt-free. Stop and resume uncommon
  14. SIG-011 SIGBUS Bus error: the address does exist — it's the access that cannot happen. Program faults uncommon
  15. SIG-012 SIGFPE The “floating-point” exception that is almost never about floating point. Program faults uncommon
  16. SIG-014 SIGABRT The program gives up on itself: abort() rings its own bell. Program faults uncommon
  17. SIG-017 SIGALRM The alarm clock: alarm() winds it up and the kernel rings on schedule. Clocks uncommon
  18. SIG-020 SIGPIPE A write into a pipe with nobody on the other end — which is why head ends the conversation. Resources uncommon
  19. SIG-023 SIGUSR1 A bell with no factory ring: each program agrees on its own meaning. The user's uncommon
  20. SIG-025 SIGWINCH The window changed size — the bell that makes the whole terminal redraw. The user's uncommon
  21. SIG-001 SIGHUP The phone went dead — and daemons took it to mean “reread your configuration”. Termination common
  22. SIG-002 SIGINT Ctrl+C: the interruption that leaves the keyboard and arrives as a signal. Termination common
  23. SIG-004 SIGTERM The polite request: tidy up, close the doors, turn off the lights. Termination common
  24. SIG-005 SIGKILL The bullet: the process never hears this ring — the kernel acts alone. Termination common
  25. SIG-007 SIGTSTP Ctrl+Z: the pause that comes from the keyboard and can be refused. Stop and resume common
  26. SIG-010 SIGSEGV The segmentation fault: the program touched memory that wasn't its own. Program faults common