dup2: Remove check for dup2, unless supporting old obsolete platforms.

[pspp] / doc / posix-functions / dup2.texi

diff --git a/doc/posix-functions/dup2.texi b/doc/posix-functions/dup2.texi
index 6509f0e286723aaf9f358d6341f832f2cd9db4ae..6054c303baf2273bd0c21847291fe764f65f0fb2 100644 (file)
--- a/doc/posix-functions/dup2.texi
+++ b/doc/posix-functions/dup2.texi
@@ -2,11 +2,11 @@
 @section @code{dup2}
 @findex dup2
 
-POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/dup2.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/dup2.html}
 
-Gnulib module: dup2
+Gnulib module: dup2 or dup2-obsolete
 
-Portability problems fixed by Gnulib:
+Portability problems fixed by either Gnulib module @code{dup2} or @code{dup2-obsolete}:
 @itemize
 @item
 This function always returns 0 for success on some platforms:
@@ -17,13 +17,27 @@ This function can hang when duplicating an fd to itself on some platforms:
 mingw.
 
 @item
-This function returns 0 for @code(dup2 (1, 1)} on some platforms:
+This function resets the @code{FD_CLOEXEC} flag when duplicating an fd
+to itself on some platforms:
+Haiku.
+
+@item
+This function returns 0 for @code{dup2 (1, 1)} on some platforms:
 Cygwin 1.5.x.
 
 @item
 This function may return @code{-EBADF} instead of @code{-1} on some platforms:
-Linux releases between July 2008 and May 2009.
+Linux releases between July 2008 and May 2009 (versions 2.6.27 to 2.6.29).
+
+@item
+This function returns @code{EMFILE} instead of @code{EBADF} for
+extremely large targets, which interferes with using
+@code{dup2(fd,fd)==fd)} as the minimal @code{EBADF} filter:
+FreeBSD 6.1, Cygwin 1.5.
+@end itemize
 
+Portability problems fixed by Gnulib module @code{dup2-obsolete}:
+@itemize
 @item
 This function is missing on some older platforms.
 @end itemize