X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=doc%2Fposix-functions%2Fdup2.texi;h=59bad08f802070b3f0314f1bc084c7f678c46b44;hb=14b6d70139486b63e66257aad1abe2a9615f4d96;hp=bfaff38c10a728dc4bffa547dacd9f10a36d47bf;hpb=ddd625ddd088a87d5598256d09b2036c63063386;p=gnulib.git

diff --git a/doc/posix-functions/dup2.texi b/doc/posix-functions/dup2.texi
index bfaff38c1..59bad08f8 100644
--- a/doc/posix-functions/dup2.texi
+++ b/doc/posix-functions/dup2.texi
@@ -2,7 +2,7 @@
 @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
 
@@ -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