Add change_attr_fd()

[elogind.git] / src / shared / util.c

diff --git a/src/shared/util.c b/src/shared/util.c
index 5cbbe8fb7d2886ffbbe36fab7cde07aba50fbe2c..ad548da82ab7663d0cda69b3e5d291c8acefb712 100644 (file)
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -7843,6 +7843,28 @@ 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);