From 9f60e85af74ddbbbc26e06ba6621f80abc868da7 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Mon, 18 Jul 2022 12:49:05 +0000
Subject:  Fix allread errno management

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libs6/s6_dtally_read.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/libs6/s6_dtally_read.c')

diff --git a/src/libs6/s6_dtally_read.c b/src/libs6/s6_dtally_read.c
index a1623cc..fbd40b0 100644
--- a/src/libs6/s6_dtally_read.c
+++ b/src/libs6/s6_dtally_read.c
@@ -4,6 +4,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
+
 #include <skalibs/allreadwrite.h>
 #include <skalibs/tai.h>
 #include <skalibs/djbunix.h>
@@ -19,6 +20,7 @@ static int truncit (char const *s)
 
 ssize_t s6_dtally_read (char const *sv, s6_dtally_t *tab, size_t max)
 {
+  int e = errno ;
   size_t len = strlen(sv) ;
   size_t n ;
   int fd ;
@@ -39,10 +41,12 @@ ssize_t s6_dtally_read (char const *sv, s6_dtally_t *tab, size_t max)
   {
     char tmp[n ? S6_DTALLY_PACK * n : 1] ;
     if (lseek(fd, -(off_t)(n * S6_DTALLY_PACK), SEEK_END) < 0) goto err ;
+    errno = EPIPE ;
     if (allread(fd, tmp, n * S6_DTALLY_PACK) < n * S6_DTALLY_PACK) goto err ;
     fd_close(fd) ;
     for (size_t i = 0 ; i < n ; i++) s6_dtally_unpack(tmp + i * S6_DTALLY_PACK, tab + i) ;
   }
+  errno = e ;
   return n ;
 
  err:
-- 
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