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26 lines
912 B
Plaintext
26 lines
912 B
Plaintext
@node signal
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@section @code{signal}
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@findex signal
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POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/signal.html}
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Gnulib module: ---
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Portability problems fixed by Gnulib:
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@itemize
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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On System V platforms, when the signal is triggered, the kernel uninstalls the
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handler (i.e.@: resets the signal's action to SIG_DFL) before invoking the
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handler. This opens the door to race conditions: undesired things happen
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if the signal is triggered twice and the signal handler was not quick enough
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reinstalling itself as a handler. On BSD platforms and glibc platforms, on the
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other hand, when the signal is triggered, the kernel blocks the signal
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before invoking the handler. This is saner, but POSIX still allows either
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behavior. To avoid this problem, use @code{sigaction} instead of
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@code{signal}.
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@end itemize
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