From: Francesco Chemolli <5175948+kinkie@users.noreply.github.com>
Date: Thu, 25 Jan 2024 13:48:35 +0000 (+0000)
Subject: Emulate fsync on mingw (#1650)
X-Git-Tag: SQUID_7_0_1~232
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3f045e25d2d4d543a0e7bc5423b3922d9441a54a;p=thirdparty%2Fsquid.git

Emulate fsync on mingw (#1650)

MS Windows (and mingw) do not offer fsync(),
but they offer the API-compatible _commit().
---

diff --git a/compat/os/mingw.h b/compat/os/mingw.h
index 6abd702db8..6a0d2a8649 100644
--- a/compat/os/mingw.h
+++ b/compat/os/mingw.h
@@ -32,5 +32,19 @@
 #include <windows.h>
 #endif
 
+// needed for _commmit and _get_osfhandle
+#if HAVE_IO_H
+#include <io.h>
+#endif
+
+#if !HAVE_FSYNC
+// _commit(fd) is API-compatible with fsync(fd) and has equivalent behaviour
+inline int
+fsync(int fd)
+{
+    return _commit(fd);
+}
+#endif
+
 #endif /* _SQUID_MINGW_*/
 #endif /* SQUID_OS_MINGW_H */
diff --git a/configure.ac b/configure.ac
index 57c5cdafc6..de6bc5e5ac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -191,7 +191,7 @@ AS_CASE(["$squid_host_os"],
     CXXFLAGS="$CXXFLAGS -mthreads -static-libgcc -static-libstdc++"
     dnl Check for Winsock only on MinGW
     SQUID_CHECK_WINSOCK_LIB
-    AC_CHECK_HEADERS([ws2tcpip.h winsock2.h windows.h],,,[
+    AC_CHECK_HEADERS([ws2tcpip.h winsock2.h windows.h io.h],,,[
 #if HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #endif
@@ -204,6 +204,7 @@ AS_CASE(["$squid_host_os"],
     ])
     MINGW_LIBS="-lmingwex"
     AC_SUBST(MINGW_LIBS)
+    AC_CHECK_FUNCS([fsync])
   ],
 
   [freebsd],[