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

The glibc wrapper silently ignores attempts to block the two
real-time signals used by NPTL.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-03-22 11:31:35 +01:00
parent 4ff3769fff
commit 3699b15436
1 changed files with 8 additions and 0 deletions
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man2/sigprocmask.2
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@ -143,6 +143,14 @@ See
for details on manipulating signal sets.
.\"
.SS C library/kernel ABI differences
The glibc wrapper function for
.BR sigprocmask ()
silently ignores attempts to block 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 sigprocmask ().
However, with the addition of real-time signals in Linux 2.2,