From: Samuel Martin <s.martin49@gmail.com>
Date: Sat, 12 Jan 2013 08:23:57 +0000 (+0100)
Subject: Make sync_file_range() usage optional
X-Git-Tag: v2.2.0-rc1~114
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=281047b8a004f2c2d9aea14f7e58166d0cd93775;p=lttng-tools.git

Make sync_file_range() usage optional

Under uClibc, sync_file_range() is not available under all
architectures, so we fall back to fdatasync() in this case.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: David Goulet <dgoulet@efficios.com>
---

diff --git a/configure.ac b/configure.ac
index 857e8e9fc..91e76f06a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -150,7 +150,7 @@ AS_IF([test "x$lttng_ust_support" = "xyes"], [
 	)
 ])
 AM_CONDITIONAL([HAVE_LIBLTTNG_UST_CTL], [test "x$lttng_ust_ctl_found" = xyes])
-AC_CHECK_FUNCS([sched_getcpu sysconf])
+AC_CHECK_FUNCS([sched_getcpu sysconf sync_file_range])
 
 # check for dlopen
 AC_CHECK_LIB([dl], [dlopen],
diff --git a/src/common/compat/compat-fcntl.c b/src/common/compat/compat-fcntl.c
index 5a1c757b8..7ff63a3a1 100644
--- a/src/common/compat/compat-fcntl.c
+++ b/src/common/compat/compat-fcntl.c
@@ -23,7 +23,11 @@
 int compat_sync_file_range(int fd, off64_t offset, off64_t nbytes,
 		unsigned int flags)
 {
+#ifdef HAVE_SYNC_FILE_RANGE
 	return sync_file_range(fd, offset, nbytes, flags);
+#else
+	return fdatasync(fd);
+#endif
 }
 
 #endif /* __linux__ */