throw prefix + ": " + buffer;
}
+/// This function builds an error message into \p ErrMsg using the \p prefix
+/// string and the Unix error number given by \p errnum. If errnum is -1, the
+/// default then the value of errno is used.
+/// @brief Make an error message
+inline void MakeErrMsg(
+ std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
+ if (!ErrMsg)
+ return;
+ char buffer[MAXPATHLEN];
+ buffer[0] = 0;
+ if (errnum == -1)
+ errnum = errno;
+#ifdef HAVE_STRERROR_R
+ // strerror_r is thread-safe.
+ if (errnum)
+ strerror_r(errnum,buffer,MAXPATHLEN-1);
+#elif HAVE_STRERROR
+ // Copy the thread un-safe result of strerror into
+ // the buffer as fast as possible to minimize impact
+ // of collision of strerror in multiple threads.
+ if (errnum)
+ strncpy(buffer,strerror(errnum),MAXPATHLEN-1);
+ buffer[MAXPATHLEN-1] = 0;
+#else
+ // Strange that this system doesn't even have strerror
+ // but, oh well, just use a generic message
+ sprintf(buffer, "Error #%d", errnum);
+#endif
+ *ErrMsg = buffer;
+}
+
#endif