[systemd-devel] [PATCH 1/4] Add change_attr_fd()

[Goffredo Baroncelli]

From: Goffredo Baroncelli <kreijack at inwind.it>

Add change_attr_fd() function to modify the file/directory attribute.
---
 src/shared/util.c | 22 ++++++++++++++++++++++
 src/shared/util.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/src/shared/util.c b/src/shared/util.c
index ba035ca..56097ec 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -7832,6 +7832,28 @@ int chattr_path(const char *p, bool b, unsigned mask) {
         return chattr_fd(fd, b, mask);
 }
 
+int change_attr_fd(int fd, unsigned value, unsigned mask) {
+        unsigned old_attr, new_attr;
+
+        assert(fd >= 0);
+
+        if (mask == 0)
+                return 0;
+
+        if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0)
+                return -errno;
+
+        new_attr = (old_attr & ~mask) |(value & mask);
+
+        if (new_attr == old_attr)
+                return 0;
+
+        if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0)
+                return -errno;
+
+        return 0;
+}
+
 int read_attr_fd(int fd, unsigned *ret) {
         assert(fd >= 0);
 
diff --git a/src/shared/util.h b/src/shared/util.h
index a83b588..a0bc883 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -1052,6 +1052,7 @@ int same_fd(int a, int b);
 
 int chattr_fd(int fd, bool b, unsigned mask);
 int chattr_path(const char *p, bool b, unsigned mask);
+int change_attr_fd(int fd, unsigned value, unsigned mask);
 
 int read_attr_fd(int fd, unsigned *ret);
 int read_attr_path(const char *p, unsigned *ret);
-- 
2.1.4