From cfac1da2aaccaf45a669b0a53c82a32c8231827c Mon Sep 17 00:00:00 2001
From: Ron Yorston <rmy@pobox.com>
Date: Mon, 7 Jun 2021 16:18:56 +0100
Subject: win32: partial implementation of sync(2)
Provide a partial implementation of sync(2), so sync(1) can actually
do something in some circumstances:
- Only logical drives are handled.
- Flushing buffers requires administrative privileges. If run as
a normal user nothing will happen.
---
win32/mingw.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
(limited to 'win32/mingw.c')
diff --git a/win32/mingw.c b/win32/mingw.c
index 3183cd78e..a65a0a6d1 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -1666,6 +1666,29 @@ int mingw_rmdir(const char *path)
return rmdir(path);
}
+void mingw_sync(void)
+{
+ HANDLE h;
+ FILE *mnt;
+ struct mntent *entry;
+ char name[] = "\\\\.\\C:";
+
+ mnt = setmntent(bb_path_mtab_file, "r");
+ if (mnt) {
+ while ((entry=getmntent(mnt)) != NULL) {
+ name[4] = entry->mnt_dir[0];
+ h = CreateFile(name, GENERIC_READ | GENERIC_WRITE,
+ FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
+ OPEN_EXISTING, 0, NULL);
+ if (h != INVALID_HANDLE_VALUE) {
+ FlushFileBuffers(h);
+ CloseHandle(h);
+ }
+ }
+ endmntent(mnt);
+ }
+}
+
#define NUMEXT 5
static const char win_suffix[NUMEXT][4] = { "sh", "com", "exe", "bat", "cmd" };
--
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