doc: Update regarding NetBSD

[Bruno Haible]

This patch updates the documentation regarding two NetBSD bugs that I just filed
(see attachments).


2023-02-03  Bruno Haible  <bruno@clisp.org>

        doc: Update regarding NetBSD.
        * doc/posix-functions/sigprocmask.texi: Mention a NetBSD 9.0 bug.
        * doc/posix-functions/pthread_sigmask.texi: Likewise.

diff --git a/doc/posix-functions/pthread_sigmask.texi 
b/doc/posix-functions/pthread_sigmask.texi
index 47ee1866b0..bbea927e4f 100644
--- a/doc/posix-functions/pthread_sigmask.texi
+++ b/doc/posix-functions/pthread_sigmask.texi
@@ -35,6 +35,6 @@ Portability problems not fixed by Gnulib:
 On platforms that do not natively support this function,
 it has unspecified behavior in a multi-threaded process.
 @item
-This function may not fail when the first argument is invalid on some 
platforms:
-NetBSD 8.0.
+In case of failure, the return value is wrong on some platforms:
+NetBSD 9.0 when libpthread is not in use.
 @end itemize
diff --git a/doc/posix-functions/sigprocmask.texi 
b/doc/posix-functions/sigprocmask.texi
index 1a1379a21d..2086e6a8b2 100644
--- a/doc/posix-functions/sigprocmask.texi
+++ b/doc/posix-functions/sigprocmask.texi
@@ -15,6 +15,9 @@ mingw, MSVC 14.
 
 Portability problems not fixed by Gnulib:
 @itemize
+@item
+In case of failure, the return value is wrong on some platforms:
+NetBSD 9.0 when libpthread is in use.
 @end itemize
 
 Note: Although @code{sigprocmask} officially has undefined behaviour in

netbsd-bug1.txt
Description: Text document