mirror of https://github.com/mkerrisk/man-pages
sigaction.2: Note treatment of signals used internally by NPTL
The glibc wrapper gives an EINVAL error on attempts to change the disposition of either of the two real-time signals used by NPTL. Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -838,6 +838,16 @@ for a list of the async-signal-safe functions that can be
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safely called inside from inside a signal handler.
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.\"
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.SS C library/kernel ABI differences
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The glibc wrapper function for
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.BR sigaction ()
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gives an error
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.RB ( EINVAL )
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on attempts to change the disposition of the two real-time signals
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used internally by the NPTL threading implementation.
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See
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.BR nptl (7)
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for details.
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The original Linux system call was named
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.BR sigaction ().
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However, with the addition of real-time signals in Linux 2.2,
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