[libvirt] [PATCH 1/7] Add virFileTouch for creating empty files
From: "Daniel P. Berrange" <berrange(a)redhat.com>
Add a virFileTouch API which ensures that a file will always
exist, even if zero length
* src/lxc/lxc_container.c, src/util/virfile.h: virFileTouch
---
src/util/virfile.c | 21 +++++++++++++++++++++
src/util/virfile.h | 2 ++
2 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/src/util/virfile.c b/src/util/virfile.c
index cbc3fcc..e6b469c 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -390,3 +390,24 @@ cleanup:
}
return ret;
}
+
+
+int virFileTouch(const char *path, mode_t mode)
+{
+ int fd = -1;
+
+ if ((fd = open(path, O_WRONLY | O_CREAT, mode)) < 0) {
+ virReportSystemError(errno, _("cannot create file '%s'"),
+ path);
+ return -1;
+ }
+
+ if (VIR_CLOSE(fd) < 0) {
+ virReportSystemError(errno, _("cannot save file '%s'"),
+ path);
+ VIR_FORCE_CLOSE(fd);
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/src/util/virfile.h b/src/util/virfile.h
index a6e6597..7be15b5 100644
--- a/src/util/virfile.h
+++ b/src/util/virfile.h
@@ -74,4 +74,6 @@ int virFileRewrite(const char *path,
virFileRewriteFunc rewrite,
void *opaque);
+int virFileTouch(const char *path, mode_t mode);
+
#endif /* __VIR_FILES_H */
--
1.7.7.5