From: Goffredo Baroncelli <kreijack@inwind.it>
Date: Mon, 16 Mar 2015 19:33:49 +0000 (+0100)
Subject: Add change_attr_fd()
X-Git-Tag: v219.0~262
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=5b9fbd354eddd80051de3cd17510d6be60274931;p=elogind.git

Add change_attr_fd()

Add change_attr_fd() function to modify the file/directory attribute.
---

diff --git a/src/shared/util.c b/src/shared/util.c
index 5cbbe8fb7..ad548da82 100644
--- 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);
 
diff --git a/src/shared/util.h b/src/shared/util.h
index d229e1e68..29e85bb7e 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -1053,6 +1053,7 @@ 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);