md5, sha1, sha256, sha512: add gl_SET_CRYPTO_CHECK_DEFAULT

[gnulib.git] / doc / posix-functions / popen.texi

diff --git a/doc/posix-functions/popen.texi b/doc/posix-functions/popen.texi
index f0aa801..5182214 100644 (file)
--- a/doc/posix-functions/popen.texi
+++ b/doc/posix-functions/popen.texi
@@ -2,14 +2,29 @@
 @section @code{popen}
 @findex popen
 
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/popen.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/popen.html}
 
-Gnulib module: ---
+Gnulib module: popen
 
 Portability problems fixed by Gnulib:
 @itemize
+@item
+This function is missing on some platforms:
+MSVC 9.
+@item
+Some platforms start the child with closed stdin or stdout if the
+standard descriptors were closed in the parent:
+Cygwin 1.5.x.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
+@item
+On native Windows platforms, this functions terminates the current process
+with exit code 127 if the environment variable @code{COMSPEC} is not set.
+@item
+Some platforms mistakenly set the close-on-exec bit, then if it is
+cleared by the application, the platform then leaks file descriptors
+from earlier @code{popen} calls into subsequent @code{popen} children:
+Cygwin 1.5.x.
 @end itemize