Piotr Caban : msvcrt: Fix errno set on read from write-only file.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 3fd47b4663af18d815f85f50c9f343bb6aca7066
URL:    https://gitlab.winehq.org/wine/wine/-/commit/3fd47b4663af18d815f85f50c9f343b...

Author: Piotr Caban <piotr(a)codeweavers.com>
Date:   Wed Nov  2 11:05:07 2022 +0100

msvcrt: Fix errno set on read from write-only file.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53677

---

 dlls/msvcrt/file.c       | 6 ++++++
 dlls/msvcrt/tests/file.c | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index a3140589481..81416deed5a 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -2756,6 +2756,8 @@ static int read_utf8(ioinfo *fdinfo, wchar_t *buf, unsigned int count)
                 return 0;
             }else {
                 msvcrt_set_errno(GetLastError());
+                if (GetLastError() == ERROR_ACCESS_DENIED)
+                    *_errno() = EBADF;
                 return -1;
             }
         }else if(!num_read) {
@@ -2813,6 +2815,8 @@ static int read_utf8(ioinfo *fdinfo, wchar_t *buf, unsigned int count)
             return 0;
         }else {
             msvcrt_set_errno(GetLastError());
+            if (GetLastError() == ERROR_ACCESS_DENIED)
+                *_errno() = EBADF;
             if (readbuf != min_buf) free(readbuf);
             return -1;
         }
@@ -3041,6 +3045,8 @@ static int read_i(int fd, ioinfo *fdinfo, void *buf, unsigned int count)
         {
             TRACE(":failed-last error (%ld)\n", GetLastError());
             msvcrt_set_errno(GetLastError());
+            if (GetLastError() == ERROR_ACCESS_DENIED)
+                *_errno() = EBADF;
             return -1;
         }
     }
diff --git a/dlls/msvcrt/tests/file.c b/dlls/msvcrt/tests/file.c
index 78ed8931d7a..91b057ea72e 100644
--- a/dlls/msvcrt/tests/file.c
+++ b/dlls/msvcrt/tests/file.c
@@ -258,6 +258,13 @@ static void test_readmode( BOOL ascii_mode )
         write (fd, &padbuffer[i], 1);
     write (fd, nlbuffer, strlen(nlbuffer));
     write (fd, outbuffer, sizeof (outbuffer));
+
+    errno = 0xdeadbeef;
+    _doserrno = 0xdeadbeef;
+    ok(read(fd, buffer, 1) == -1, "read succeeded on write-only file\n");
+    ok(errno == EBADF, "errno = %d\n", errno);
+    ok(_doserrno == ERROR_ACCESS_DENIED, "doserrno = %ld\n", _doserrno);
+
     close (fd);
     
     if (ascii_mode) {