path: root/mcon/U/d_pipe2.U
diff options
Diffstat (limited to 'mcon/U/d_pipe2.U')
1 files changed, 46 insertions, 0 deletions
diff --git a/mcon/U/d_pipe2.U b/mcon/U/d_pipe2.U
new file mode 100644
index 0000000..df03115
--- /dev/null
+++ b/mcon/U/d_pipe2.U
@@ -0,0 +1,46 @@
+?RCS: Copyright (c) 2015, Raphael Manfredi
+?RCS: You may redistribute only under the terms of the Artistic License,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic License; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?MAKE:d_pipe2: Trylink cat i_unistd i_sysfile
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the HAS_PIPE2 symbol, which
+?S: indicates to the C program that the pipe2() routine is available
+?S: to create an inter-process channel with some flags.
+?C: This symbol, if defined, indicates that the pipe routine is
+?C: available to create an inter-process channel with O_CLOEXEC or
+?C: O_NONBLOCK flags.
+?H:#$d_pipe2 HAS_PIPE2 /**/
+?LINT:set d_pipe2
+: see if pipe2 exists
+$cat >try.c <<EOC
+#$i_unistd I_UNISTD
+#$i_sysfile I_SYS_FILE
+#ifdef I_UNISTD
+#include <unistd.h>
+#ifdef I_SYS_FILE
+#include <sys/file.h> /* For O_* constants */
+#include <fcntl.h> /* For O_* constants */
+int main(void)
+ static int fds[2], ret;
+ ret |= pipe2(fds, O_CLOEXEC | O_NONBLOCK);
+ return ret ? 0 : 1;
+set d_pipe2
+eval $trylink