The original code calls fseek and if it fails then it assumes that fp is a pipe
and calls skipStream, which uses fread instead. On Solaris fseek fails but
it also changes the file position, so the fread does not read anything and the
function fails.  The modified implementation uses fstat to find out if fp is
a pipe.

This is Solaris specific patch but can be offered also upstream. 

--- lz4-1.10.0/programs/lz4io.c.orig
+++ lz4-1.10.0/programs/lz4io.c
@@ -2320,14 +2320,21 @@
 {
     const unsigned stepMax = 1U << 30;
     int errorNb = 0;
+    struct stat statBuf;
 
     if (where != SEEK_CUR) return -1;  /* Only allows SEEK_CUR */
     while (offset > 0) {
         unsigned s = offset;
         if (s > stepMax) s = stepMax;
-        errorNb = UTIL_fseek(fp, (long)s, SEEK_CUR);
-        if (errorNb==0) { offset -= s; continue; }
-        errorNb = skipStream(fp, offset);
+        errorNb = fstat(fileno(fp), &statBuf);
+        if (errorNb == 0) {
+            if (S_ISFIFO(statBuf.st_mode))
+                errorNb = skipStream(fp, offset);
+            else {
+                errorNb = UTIL_fseek(fp, (long)s, SEEK_CUR);
+                if (errorNb==0) { offset -= s; continue; }
+            }
+        }			
         offset = 0;
     }
     return errorNb;