Signals: Difference between revisions
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Signals are a Unix invention for asynchronous signaling, and were integrated into the C standard (<signal.h>). When a process receives a signal (send by hardware, or another process using <tt>raise()</tt>), a ''signal handler'' is called. A signal handler is a C function that handles the signal; which function to call on which signal is defined by passing its function pointer to the <tt>signal()</tt> function. (If no signal handler is defined for a given signal, a <tt>raise()</tt> of that signal aborts the program.) |
Signals are a Unix invention for asynchronous signaling, and were integrated into the C standard (<signal.h>). When a process receives a signal (send by hardware, or another process using <tt>raise()</tt>), a ''signal handler'' is called. A signal handler is a C function that handles the signal; which function to call on which signal is defined by passing its function pointer to the <tt>signal()</tt> function. (If no signal handler is defined for a given signal, a <tt>raise()</tt> of that signal aborts the program.) |
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==Handling== |
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Signal handling is ''tricky'', since it breaks the single-control-flow structure of a C program. Make sure you read the manuals |
Signal handling is ''tricky'', since it breaks the single-control-flow structure of a C program. Make sure you read the manuals. |
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==See Also== |
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*[http://www.linuxjournal.com/article/3985 The Linux Signals Handling Model] |
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*[http://users.actcom.co.il/~choo/lupg/tutorials/signals/signals-programming.html Introduction to Unix Signals Programming] |
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[[Category:IPC]] |
[[Category:IPC]] |
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Revision as of 22:53, 10 July 2007
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Signals are a Unix invention for asynchronous signaling, and were integrated into the C standard (<signal.h>). When a process receives a signal (send by hardware, or another process using raise()), a signal handler is called. A signal handler is a C function that handles the signal; which function to call on which signal is defined by passing its function pointer to the signal() function. (If no signal handler is defined for a given signal, a raise() of that signal aborts the program.)
Handling
Signal handling is tricky, since it breaks the single-control-flow structure of a C program. Make sure you read the manuals.