From: Yann Collet <cyan@fb.com>
Date: Thu, 27 Mar 2025 02:21:48 +0000 (-0700)
Subject: add error message clarification for inputs as process substitution
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=8626da73b6596bdd30c1289525db59f09737226d;p=thirdparty%2Fzstd.git

add error message clarification for inputs as process substitution
---

diff --git a/programs/fileio.c b/programs/fileio.c
index 6514bf32c..6c6faa485 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -660,6 +660,9 @@ FIO_openDstFile(FIO_ctx_t* fCtx, FIO_prefs_t* const prefs,
 #endif
         if (f == NULL) {
             DISPLAYLEVEL(1, "zstd: %s: %s\n", dstFileName, strerror(errno));
+            if (UTIL_isFileDescriptorPipe(dstFileName)) {
+                DISPLAYLEVEL(1, "When using process substitution (<(...)), specify an output destination with -o or -c. \n");
+            }
         } else {
             /* An increased buffer size can provide a significant performance
              * boost on some platforms. Note that providing a NULL buf with a