Re: [libvirt] [PATCH v4 2/5] util: Create virFileAccessibleAs function
On 10/20/2011 08:52 AM, Michal Privoznik wrote:
This function checks if a given path is accessible under
given uid and gid.
---
src/util/util.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/util/util.h | 3 ++
2 files changed, 81 insertions(+), 0 deletions(-)
diff --git a/src/util/util.c b/src/util/util.c
index 01146f5..2020415 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -671,6 +671,72 @@ virFileIsExecutable(const char *file)
}
#ifndef WIN32
+/* Check that a file is accessible under certain
+ * user& gid.
+ * @mode can be R_OK, W_OK, X_OK or F_OK.
More accurately:
@mode can be F_OK, or a bitwise combination of R_OK, W_OK, and X_OK.
+ * see 'man accesss' for more details.
s/accesss/access/
+ * Returns 0 on success, -errno on fail,
+ *>0 on signaled child.
+ */
+int
+virFileAccessibleAs(const char *path, int mode,
+ uid_t uid, gid_t gid)
+{
+ pid_t pid;
+ int waitret, status, ret = 0;
+ int forkRet;
+
+ forkRet = virFork(&pid);
Should you take a shortcut that if uid and gid match
geteuid()/getegid(), then we avoid the fork()?
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org