Talk:Handle a signal: Difference between revisions
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== Error in C example == |
== Error in C example == |
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The C example uses <code>printf</code> in the signal handler. However, printf isn't signal-safe, that is, if the signal happens during the printf call in the main program, it might fail. The correct way would be to set a flag of type <code>volatile sig_atomic_t</code> in the signal handler, and test that flag in the main program. Note that usleep returns when interrupted by a signal, so handling of that signal will not be delayed that way. |
The C example uses <code>printf</code> in the signal handler. However, printf isn't signal-safe, that is, if the signal happens during the printf call in the main program, it might fail. The correct way would be to set a flag of type <code>volatile sig_atomic_t</code> in the signal handler, and test that flag in the main program. Note that usleep returns when interrupted by a signal, so handling of that signal will not be delayed that way. --[[User:Ce|Ce]] 08:38, 31 March 2009 (UTC) |
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Revision as of 08:38, 31 March 2009
Error in C example
The C example uses printf in the signal handler. However, printf isn't signal-safe, that is, if the signal happens during the printf call in the main program, it might fail. The correct way would be to set a flag of type volatile sig_atomic_t in the signal handler, and test that flag in the main program. Note that usleep returns when interrupted by a signal, so handling of that signal will not be delayed that way. --Ce 08:38, 31 March 2009 (UTC)