Import BSDDB 4.7.25 (as of svn r89086)

os/os_errno.c

@@ -0,0 +1,129 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1999,2008 Oracle.  All rights reserved.
+ *
+ * $Id: os_errno.c 63573 2008-05-23 21:43:21Z trent.nelson $
+ */
+
+#include "db_config.h"
+
+#include "db_int.h"
+
+/*
+ * __os_get_errno_ret_zero --
+ *	Return the last system error, including an error of zero.
+ *
+ * PUBLIC: int __os_get_errno_ret_zero __P((void));
+ */
+int
+__os_get_errno_ret_zero()
+{
+	/* This routine must be able to return the same value repeatedly. */
+	return (errno);
+}
+
+/*
+ * We've seen cases where system calls failed but errno was never set.  For
+ * that reason, __os_get_errno() and __os_get_syserr set errno to EAGAIN if
+ * it's not already set, to work around the problem.  For obvious reasons,
+ * we can only call this function if we know an error has occurred, that
+ * is, we can't test the return for a non-zero value after the get call.
+ *
+ * __os_get_errno --
+ *	Return the last ANSI C "errno" value or EAGAIN if the last error
+ *	is zero.
+ *
+ * PUBLIC: int __os_get_errno __P((void));
+ */
+int
+__os_get_errno()
+{
+	/* This routine must be able to return the same value repeatedly. */
+	return (__os_get_syserr());
+}
+
+#if 0
+/*
+ * __os_get_neterr --
+ *      Return the last network-related error or EAGAIN if the last
+ *	error is zero.
+ *
+ * PUBLIC: int __os_get_neterr __P((void));
+ */
+int
+__os_get_neterr()
+{
+	/* This routine must be able to return the same value repeatedly. */
+	return (__os_get_syserr());
+}
+#endif
+
+/*
+ * __os_get_syserr --
+ *	Return the last system error or EAGAIN if the last error is zero.
+ *
+ * PUBLIC: int __os_get_syserr __P((void));
+ */
+int
+__os_get_syserr()
+{
+	/* This routine must be able to return the same value repeatedly. */
+	if (errno == 0)
+		__os_set_errno(EAGAIN);
+	return (errno);
+}
+
+/*
+ * __os_set_errno --
+ *	Set the value of errno.
+ *
+ * PUBLIC: void __os_set_errno __P((int));
+ */
+void
+__os_set_errno(evalue)
+	int evalue;
+{
+	/*
+	 * This routine is called by the compatibility interfaces (DB 1.85,
+	 * dbm and hsearch).  Force values > 0, that is, not one of DB 2.X
+	 * and later's public error returns.  If something bad has happened,
+	 * default to EFAULT -- a nasty return.  Otherwise, default to EINVAL.
+	 * As the compatibility APIs aren't included on Windows, the Windows
+	 * version of this routine doesn't need this behavior.
+	 */
+	errno =
+	    evalue >= 0 ? evalue : (evalue == DB_RUNRECOVERY ? EFAULT : EINVAL);
+}
+
+/*
+ * __os_strerror --
+ *	Return a string associated with the system error.
+ *
+ * PUBLIC: char *__os_strerror __P((int, char *, size_t));
+ */
+char *
+__os_strerror(error, buf, len)
+	int error;
+	char *buf;
+	size_t len;
+{
+	/* No translation is needed in the POSIX layer. */
+	(void)strncpy(buf, strerror(error), len - 1);
+	buf[len - 1] = '\0';
+
+	return (buf);
+}
+
+/*
+ * __os_posix_err
+ *	Convert a system error to a POSIX error.
+ *
+ * PUBLIC: int __os_posix_err __P((int));
+ */
+int
+__os_posix_err(error)
+	int error;
+{
+	return (error);
+}