mirror of https://github.com/nodejs/node.git
78 lines
2.5 KiB
ReStructuredText
78 lines
2.5 KiB
ReStructuredText
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.. _signal:
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:c:type:`uv_signal_t` --- Signal handle
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=======================================
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Signal handles implement Unix style signal handling on a per-event loop bases.
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Reception of some signals is emulated on Windows:
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* SIGINT is normally delivered when the user presses CTRL+C. However, like
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on Unix, it is not generated when terminal raw mode is enabled.
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* SIGBREAK is delivered when the user pressed CTRL + BREAK.
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* SIGHUP is generated when the user closes the console window. On SIGHUP the
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program is given approximately 10 seconds to perform cleanup. After that
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Windows will unconditionally terminate it.
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* SIGWINCH is raised whenever libuv detects that the console has been
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resized. SIGWINCH is emulated by libuv when the program uses a :c:type:`uv_tty_t`
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handle to write to the console. SIGWINCH may not always be delivered in a
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timely manner; libuv will only detect size changes when the cursor is
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being moved. When a readable :c:type:`uv_tty_t` handle is used in raw mode,
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resizing the console buffer will also trigger a SIGWINCH signal.
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Watchers for other signals can be successfully created, but these signals
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are never received. These signals are: `SIGILL`, `SIGABRT`, `SIGFPE`, `SIGSEGV`,
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`SIGTERM` and `SIGKILL.`
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Calls to raise() or abort() to programmatically raise a signal are
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not detected by libuv; these will not trigger a signal watcher.
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.. note::
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On Linux SIGRT0 and SIGRT1 (signals 32 and 33) are used by the NPTL pthreads library to
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manage threads. Installing watchers for those signals will lead to unpredictable behavior
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and is strongly discouraged. Future versions of libuv may simply reject them.
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Data types
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----------
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.. c:type:: uv_signal_t
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Signal handle type.
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.. c:type:: void (*uv_signal_cb)(uv_signal_t* handle, int signum)
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Type definition for callback passed to :c:func:`uv_signal_start`.
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Public members
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^^^^^^^^^^^^^^
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.. c:member:: int uv_signal_t.signum
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Signal being monitored by this handle. Readonly.
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.. seealso:: The :c:type:`uv_handle_t` members also apply.
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API
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---
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.. c:function:: int uv_signal_init(uv_loop_t*, uv_signal_t* signal)
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Initialize the handle.
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.. c:function:: int uv_signal_start(uv_signal_t* signal, uv_signal_cb cb, int signum)
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Start the handle with the given callback, watching for the given signal.
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.. c:function:: int uv_signal_stop(uv_signal_t* signal)
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Stop the handle, the callback will no longer be called.
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.. seealso:: The :c:type:`uv_handle_t` API functions also apply.
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