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Re: portability of fopen and 'e' (O_CLOEXEC) flag
From: |
Daiki Ueno |
Subject: |
Re: portability of fopen and 'e' (O_CLOEXEC) flag |
Date: |
Thu, 28 May 2020 12:04:12 +0200 |
Daiki Ueno <ueno@gnu.org> writes:
> Bruno Haible <bruno@clisp.org> writes:
>
>>> Here are proposed patches for other modules. Does this look right?
>>
>> There were no objections. I pushed the changes.
>
> Thank you for this. I have rebased GnuTLS on top of it, but noticed a
> strange test failures on Windows CI, which involve reading binary files
> (OCSP response):
> https://gitlab.com/gnutls/gnutls/-/jobs/569815031
>
> It seems that the fopen module ignores a 'b' flag. The attached patch
> fixes the failures.
Sorry, attached an old patch; this would be simpler (and also supports
other platforms that need O_BINARY).
>From 81695244eb467603009a2777c3a8438f1a707954 Mon Sep 17 00:00:00 2001
From: Daiki Ueno <ueno@gnu.org>
Date: Thu, 28 May 2020 11:40:49 +0200
Subject: [PATCH] fopen-gnu: make 'b' flag can be used with 'e' on Windows
* lib/fopen.c (rpl_fopen): Pass O_BINARY to open, if a 'b' flag is
specified on Windows.
* tests/test-fopen-gnu.c (DATA): New define.
(main): Add test for reading binary files with an 'e' flag.
---
ChangeLog | 8 ++++++++
lib/fopen.c | 4 ++++
tests/test-fopen-gnu.c | 17 +++++++++++++++++
3 files changed, 29 insertions(+)
diff --git a/ChangeLog b/ChangeLog
index c17b76b72..ea2716b2f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2020-05-28 Daiki Ueno <ueno@gnu.org>
+
+ fopen-gnu: make 'b' flag can be used with 'e' on Windows
+ * lib/fopen.c (rpl_fopen): Pass O_BINARY to open, if a 'b' flag is
+ specified on Windows.
+ * tests/test-fopen-gnu.c (DATA): New define.
+ (main): Add test for reading binary files with an 'e' flag.
+
2020-05-27 Bruno Haible <bruno@clisp.org>
Don't assume that UNICODE is not defined.
diff --git a/lib/fopen.c b/lib/fopen.c
index 20065e4c6..47d7f194d 100644
--- a/lib/fopen.c
+++ b/lib/fopen.c
@@ -101,6 +101,10 @@ rpl_fopen (const char *filename, const char *mode)
#endif
continue;
case 'b':
+ /* While it is non-standard, O_BINARY is guaranteed by
+ gnulib <fcntl.h>. We can also assume that orig_fopen
+ supports the 'b' flag. */
+ open_flags_standard |= O_BINARY;
#if GNULIB_FOPEN_GNU
if (q < fdopen_mode_buf + BUF_SIZE)
*q++ = *p;
diff --git a/tests/test-fopen-gnu.c b/tests/test-fopen-gnu.c
index cae40421a..eeb1712c7 100644
--- a/tests/test-fopen-gnu.c
+++ b/tests/test-fopen-gnu.c
@@ -29,15 +29,20 @@
#define BASE "test-fopen-gnu.t"
+/* 0x1a is an EOF on Windows. */
+#define DATA "abc\x1adef"
+
int
main (void)
{
FILE *f;
int fd;
int flags;
+ char buf[16];
/* Remove anything from prior partial run. */
unlink (BASE "file");
+ unlink (BASE "binary");
/* Create the file. */
f = fopen (BASE "file", "w");
@@ -64,8 +69,20 @@ main (void)
ASSERT (f == NULL);
ASSERT (errno == EEXIST);
+ /* Open a binary file and check that the 'e' mode doesn't interfere. */
+ f = fopen (BASE "binary", "wbe");
+ ASSERT (f);
+ ASSERT (fwrite (DATA, 1, sizeof(DATA)-1, f) == sizeof(DATA)-1);
+ ASSERT (fclose (f) == 0);
+
+ f = fopen (BASE "binary", "rbe");
+ ASSERT (f);
+ ASSERT (fread (buf, 1, sizeof(buf), f) == sizeof(DATA)-1);
+ ASSERT (fclose (f) == 0);
+
/* Cleanup. */
ASSERT (unlink (BASE "file") == 0);
+ ASSERT (unlink (BASE "binary") == 0);
return 0;
}
--
2.26.2
Regards,
--
Daiki Ueno
- portability of fopen and 'e' (O_CLOEXEC) flag, Tim Rühsen, 2020/05/11
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Bruno Haible, 2020/05/11
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Eric Blake, 2020/05/11
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Tim Rühsen, 2020/05/12
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Bruno Haible, 2020/05/24
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Daiki Ueno, 2020/05/26
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Bruno Haible, 2020/05/26
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Bruno Haible, 2020/05/26
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Bruno Haible, 2020/05/27
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Daiki Ueno, 2020/05/28
- Re: portability of fopen and 'e' (O_CLOEXEC) flag,
Daiki Ueno <=
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Bruno Haible, 2020/05/28
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Daiki Ueno, 2020/05/28
- Re: portability of fopen and 'e' (O_CLOEXEC) flag, Bruno Haible, 2020/05/29