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26103: use FIFOs rather than FD files for process substititution on Cygwin

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Peter Stephenson 2008-12-01 12:26:24 +00:00
parent 94b39fe195
commit 815cf48368
2 changed files with 19 additions and 2 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2008-12-01 Peter Stephenson <pws@csr.com>
* (with some help from Peter A. Castro): 26103: configure.ac:
FIFOs seem to be more reliable than per-process FD files for
process substitution on current Cygwin.
2008-11-27 Peter Stephenson <pws@csr.com>
* 26095: Src/utils.c: failed to compile if TIOCGWINSZ wasn't

15
configure.ac
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@ -1787,9 +1787,17 @@ dnl be good enough.
AH_TEMPLATE([PATH_DEV_FD],
[Define to the path of the /dev/fd filesystem.])
AC_CACHE_CHECK(for /dev/fd filesystem, zsh_cv_sys_path_dev_fd,
[if test "$host_os" = cygwin; then
dnl In current (2008/12/01) versions of Cygwin these are present but don't
dnl seem to work smoothly for process substitution; no great surprise
dnl since getting processes to work at all on Cygwin is a big challenge.
dnl We'll rely on FIFOs, since they do what we need.
zsh_cv_sys_path_dev_fd=no
else
[for zsh_cv_sys_path_dev_fd in /proc/self/fd /dev/fd no; do
test x`echo ok|(exec 3<&0; cat $zsh_cv_sys_path_dev_fd/3 2>/dev/null;)` = xok && break
done])
done]
fi])
if test x$zsh_cv_sys_path_dev_fd != xno; then
AC_DEFINE_UNQUOTED(PATH_DEV_FD, "$zsh_cv_sys_path_dev_fd")
fi
@ -1954,10 +1962,13 @@ fi
dnl -----------
dnl named FIFOs
dnl -----------
dnl
dnl Named FIFOs work well enough on recent versions of Cygwin
dnl to provide what we want. Simply enable them.
AC_CACHE_CHECK(if named FIFOs work,
zsh_cv_sys_fifo,
[if test "$host_os" = cygwin; then
zsh_cv_sys_fifo=no
zsh_cv_sys_fifo=yes
else
AC_TRY_RUN([
#include <fcntl.h>