X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=doc%2Fposix-functions%2Fdup2.texi;h=febbd53cc90eedc24e3f2b2708395ce5110b3689;hb=7c59efd8bc7abb8c79ae969a65ece95e68c9be4c;hp=bfaff38c10a728dc4bffa547dacd9f10a36d47bf;hpb=ddd625ddd088a87d5598256d09b2036c63063386;p=gnulib.git

diff --git a/doc/posix-functions/dup2.texi b/doc/posix-functions/dup2.texi
index bfaff38c1..febbd53cc 100644
--- a/doc/posix-functions/dup2.texi
+++ b/doc/posix-functions/dup2.texi
@@ -13,10 +13,24 @@ This function always returns 0 for success on some platforms:
 mingw.
 
 @item
-This function returns 0 for dup2 (1, 1) on some platforms:
+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:
 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 (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.
+
+@item
 This function is missing on some older platforms.
 @end itemize