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+?RCS: $Id: d_open3.U,v 3.0.1.2 1997/02/28 15:37:12 ram Exp $
+?RCS:
+?RCS: Copyright (c) 1991-1993, Raphael Manfredi
+?RCS:
+?RCS: You may redistribute only under the terms of the Artistic Licence,
+?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 Licence; a copy of which may be found at the root
+?RCS: of the source tree for dist 3.0.
+?RCS:
+?RCS: $Log: d_open3.U,v $
+?RCS: Revision 3.0.1.2 1997/02/28 15:37:12 ram
+?RCS: patch61: added ?F: metalint hint
+?RCS:
+?RCS: Revision 3.0.1.1 1995/07/25 13:58:26 ram
+?RCS: patch56: added knowledge of the O_NONBLOCK symbol
+?RCS:
+?RCS: Revision 3.0 1993/08/18 12:06:44 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?RCS:
+?MAKE:d_open3: test +cc cat +cppflags h_fcntl h_sysfile rm Setvar Findhdr
+?MAKE: -pick add $@ %<
+?X: It would be easy to separate the h_O_stuff from this.
+?X: Is there a reason to do so? -- HMS
+?S:d_open3:
+?S: This variable conditionally defines the HAS_OPEN3 manifest constant,
+?S: which indicates to the C program that the 3 argument version of
+?S: the open(2) function is available.
+?S:.
+?C:HAS_OPEN3 (OPEN3):
+?C: This manifest constant lets the C program know that the three
+?C: argument form of open(2) is available.
+?C:.
+?H:#$d_open3 HAS_OPEN3 /**/
+?H:.
+?W:%<:O_RDONLY O_WRONLY O_RDWR O_NDELAY O_APPEND O_SYNC O_CREAT O_TRUNC
+?W:%<:O_EXCL O_NONBLOCK
+?F:!open3
+?LINT:set d_open3
+?LINT:change h_fcntl h_sysfile
+: Locate the flags for 'open()'
+echo " "
+$cat >open3.c <<'EOCP'
+#include <sys/types.h>
+#ifdef I_FCNTL
+#include <fcntl.h>
+#endif
+#ifdef I_SYS_FILE
+#include <sys/file.h>
+#endif
+main() {
+ if(O_RDONLY);
+#ifdef O_TRUNC
+ exit(0);
+#else
+ exit(1);
+#endif
+}
+EOCP
+: check sys/file.h first to get FREAD on Sun
+if $test `./findhdr sys/file.h` && \
+ $cc $cppflags "-DI_SYS_FILE" open3.c -o open3 >/dev/null 2>&1 ; then
+ h_sysfile=true;
+ echo "<sys/file.h> defines the O_* constants..." >&4
+ if ./open3; then
+ echo "and you have the 3 argument form of open()." >&4
+ val="$define"
+ else
+ echo "but not the 3 argument form of open(). Oh, well." >&4
+ val="$undef"
+ fi
+elif $test `./findhdr fcntl.h` && \
+ $cc "-DI_FCNTL" open3.c -o open3 >/dev/null 2>&1 ; then
+ h_fcntl=true;
+ echo "<fcntl.h> defines the O_* constants..." >&4
+ if ./open3; then
+ echo "and you have the 3 argument form of open()." >&4
+ val="$define"
+ else
+ echo "but not the 3 argument form of open(). Oh, well." >&4
+ val="$undef"
+ fi
+else
+ val="$undef"
+ echo "I can't find the O_* constant definitions! You got problems." >&4
+fi
+set d_open3
+eval $setvar
+$rm -f open3*
+