Merge branch 't/rename_system_files'

[dss.git] / err.h

diff --git a/err.h b/err.h
new file mode 100644 (file)
index 0000000..551ff54
--- /dev/null
+++ b/err.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+extern char *dss_errlist[];
+extern char *dss_error_txt;
+
+void dss_log_set_params(int ll, const char *file, int line, const char *func);
+__printf_1_2 void dss_log(const char* fmt,...);
+
+/**
+ * This bit indicates whether a number is considered a system error number
+ * If yes, the system errno is just the result of clearing this bit from
+ * the given number.
+ */
+#define SYSTEM_ERROR_BIT 30
+
+/** Check whether the system error bit is set. */
+#define IS_SYSTEM_ERROR(num) (!!((num) & (1 << SYSTEM_ERROR_BIT)))
+
+/** Set the system error bit for the given number. */
+#define ERRNO_TO_DSS_ERROR(num) ((num) | (1 << SYSTEM_ERROR_BIT))
+
+/**
+ * dss' version of strerror(3).
+ *
+ * \param num The error number.
+ *
+ * \return The error text of \a num.
+ */
+static inline char *dss_strerror(int num)
+{
+       assert(num > 0);
+       if (IS_SYSTEM_ERROR(num))
+               return strerror((num) & ((1 << SYSTEM_ERROR_BIT) - 1));
+       else
+               return dss_errlist[num];
+}
+
+#define DSS_ERRORS \
+       DSS_ERROR(SUCCESS, "success"), \
+       DSS_ERROR(SYNTAX, "syntax error"), \
+       DSS_ERROR(ATOI_OVERFLOW, "value too large"), \
+       DSS_ERROR(STRTOLL, "unknown strtoll error"), \
+       DSS_ERROR(ATOI_NO_DIGITS, "no digits found in string"), \
+       DSS_ERROR(ATOI_JUNK_AT_END, "further characters after number"), \
+       DSS_ERROR(INVALID_NUMBER, "invalid number"), \
+       DSS_ERROR(STRFTIME, "strftime() failed"), \
+       DSS_ERROR(LOCALTIME, "localtime() failed"), \
+       DSS_ERROR(NULL_OPEN, "can not open /dev/null"), \
+       DSS_ERROR(DUP_PIPE, "exec error: can not create pipe"), \
+       DSS_ERROR(INVOLUNTARY_EXIT, "unexpected termination cause"), \
+       DSS_ERROR(BAD_EXIT_CODE, "unexpected exit code"), \
+       DSS_ERROR(SIGNAL_SIG_ERR, "signal() returned SIG_ERR"), \
+       DSS_ERROR(SIGNAL, "caught terminating signal"), \
+       DSS_ERROR(BUG, "values of beta might cause dom!"), \
+       DSS_ERROR(NOT_RUNNING, "dss not running")
+
+/**
+ * This is temporarily defined to expand to its first argument (prefixed by
+ * 'E_') and gets later redefined to expand to the error text only
+ */
+#define DSS_ERROR(err, msg) E_ ## err
+
+enum dss_error_codes {
+       DSS_ERRORS
+};
+#undef DSS_ERROR
+#define DSS_ERROR(err, msg) msg
+#define DEFINE_DSS_ERRLIST char *dss_errlist[] = {DSS_ERRORS}