For Bug 543:
Allow the ThrowErrno function to optionally accept an error number
parameter so that callers can specify the error number to be used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21384 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Unix/Unix.h b/lib/System/Unix/Unix.h
index 2f57b68..741a817 100644
--- a/lib/System/Unix/Unix.h
+++ b/lib/System/Unix/Unix.h
@@ -66,24 +66,26 @@
# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
#endif
-inline void ThrowErrno(const std::string& prefix) {
+inline void ThrowErrno(const std::string& prefix, int errnum = -1) {
char buffer[MAXPATHLEN];
buffer[0] = 0;
+ if (errnum == -1)
+ errnum = errno;
#ifdef HAVE_STRERROR_R
// strerror_r is thread-safe.
- if (errno)
- strerror_r(errno,buffer,MAXPATHLEN-1);
+ 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 (errno)
- strncpy(buffer,strerror(errno),MAXPATHLEN-1);
+ 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", errno);
+ sprintf(buffer, "Error #%d", errnum);
#endif
throw prefix + ": " + buffer;
}