error.h

   1 extern char *dss_errlist[];
   2 extern char *dss_error_txt;
   3
   4 __printf_2_3 void dss_log(int ll, const char* fmt,...);
   5
   6 /**
   7  * This bit indicates whether a number is considered a system error number
   8  * If yes, the system errno is just the result of clearing this bit from
   9  * the given number.
  10  */
  11 #define SYSTEM_ERROR_BIT 30
  12
  13 /** Check whether the system error bit is set. */
  14 #define IS_SYSTEM_ERROR(num) (!!((num) & (1 << SYSTEM_ERROR_BIT)))
  15
  16 /** Set the system error bit for the given number. */
  17 #define ERRNO_TO_DSS_ERROR(num) ((num) | (1 << SYSTEM_ERROR_BIT))
  18
  19 /** Check whether a given number is a system error number.
  20  *
  21  * \param num The value to be checked.
  22  * \param _errno The system error number.
  23  *
  24  * \return True if \a num is dss' representation of the system
  25  * error identified by \a _errno.
  26  */
  27 static inline int is_errno(int num, int _errno)
  28 {
  29         assert(num > 0 && _errno > 0);
  30         return ERRNO_TO_DSS_ERROR(_errno) == num;
  31 }
  32
  33 /**
  34  * dss' version of strerror(3).
  35  *
  36  * \param num The error number.
  37  *
  38  * \return The error text of \a num.
  39  */
  40 static inline char *dss_strerror(int num)
  41 {
  42         assert(num > 0);
  43         if (IS_SYSTEM_ERROR(num))
  44                 return strerror((num) & ((1 << SYSTEM_ERROR_BIT) - 1));
  45         else
  46                 return dss_errlist[num];
  47 }
  48
  49 static inline void log_err_msg(int loglevel, int num)
  50 {
  51         dss_log(loglevel, "%s (%s)\n", dss_error_txt, dss_strerror(num));
  52 }
  53
  54 #define DSS_ERRORS \
  55         DSS_ERROR(SUCCESS, "success") \
  56         DSS_ERROR(SYNTAX, "syntax error") \
  57         DSS_ERROR(ATOI_OVERFLOW, "value too large") \
  58         DSS_ERROR(STRTOLL, "unknown strtoll error") \
  59         DSS_ERROR(ATOI_NO_DIGITS, "no digits found in string") \
  60         DSS_ERROR(ATOI_JUNK_AT_END, "further characters after number") \
  61         DSS_ERROR(INVALID_NUMBER, "invalid number") \
  62         DSS_ERROR(STRFTIME, "strftime() failed") \
  63         DSS_ERROR(LOCALTIME, "localtime() failed") \
  64         DSS_ERROR(NULL_OPEN, "can not open /dev/null") \
  65         DSS_ERROR(DUP_PIPE, "exec error: can not create pipe") \
  66         DSS_ERROR(INVOLUNTARY_EXIT, "unexpected termination cause") \
  67         DSS_ERROR(BAD_EXIT_CODE, "unexpected exit code") \
  68         DSS_ERROR(SIGNAL_SIG_ERR, "signal() returned SIG_ERR")
  69
  70 /**
  71  * This is temporarily defined to expand to its first argument (prefixed by
  72  * 'E_') and gets later redefined to expand to the error text only
  73  */
  74 #define DSS_ERROR(err, msg) E_ ## err,
  75
  76 enum dss_error_codes {
  77         DSS_ERRORS
  78 };
  79 #undef DSS_ERROR
  80 #define DSS_ERROR(err, msg) msg,
  81 #define DEFINE_DSS_ERRLIST char *dss_errlist[] = {DSS_ERRORS}