roken: add mkostemp()

lib/roken/mkostemp.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2019 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include <string.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#include <errno.h>
+
+#include <roken.h>
+
+#ifndef O_APPEND
+#define O_APPEND 0
+#endif
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif
+#ifndef O_SYNC
+#define O_SYNC 0
+#endif
+
+#ifndef HAVE_MKOSTEMP
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+mkostemp(char *template, int flags)
+{
+    int fd = mkstemp(template);
+
+    if (flags == 0)
+        return fd;
+
+    if ((flags & O_CLOEXEC))
+        rk_cloexec(fd);
+
+    /* fcntl F_SETFL O_APPEND and O_SYNC. */
+#ifdef HAVE_FCNTL
+    if ((flags & (O_APPEND | O_SYNC))) {
+        int fl;
+
+        if ((fl = fcntl(fd, F_GETFL)) == -1 ||
+            fcntl(fd, F_SETFD, fl | (flags & (O_APPEND | O_SYNC))) == -1) {
+            int save_errno = errno;
+
+            (void) unlink(template);
+            (void) close(fd);
+            errno = save_errno;
+            return -1;
+        }
+    }
+#endif
+    return fd;
+}
+#endif