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sigwaitinfo.2: Note treatment of signals used internally by NPTL 

The glibc wrappers silently ignore attempts to wait for
signals used by NPTL.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-03-22 11:26:54 +01:00
parent 84cb494f8d
commit 363308860d
1 changed files with 10 additions and 0 deletions
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10
man2/sigwaitinfo.2
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@ -187,6 +187,16 @@ On Linux,
is a library function implemented on top of
.BR sigtimedwait ().
The glibc wrapper functions for
.BR sigwaitinfo ()
and
.BR sigtimedwait ()
silently ignore attempts to wait for the two real-time signals that
are used internally by the NPTL threading implementation.
See
.BR nptl (7)
for details.
The original Linux system call was named
.BR sigtimedwait ().
However, with the addition of real-time signals in Linux 2.2,