Add minimal fchownat and fchmodat implementations.

Fixes builds on at least OS X Lion, NetBSD 6 and Solaris 10.

1 files changed, 58 insertions, 0 deletions

diff --git a/openbsd-compat/bsd-misc.c b/openbsd-compat/bsd-misc.c
index 4bae96548..d3a41df50 100644
--- a/openbsd-compat/bsd-misc.c
+++ b/openbsd-compat/bsd-misc.c
@@ -154,6 +154,64 @@ utimensat(int fd, const char *path, const struct timespec times[2],
 }
 #endif
 
+#ifndef HAVE_FCHOWNAT
+/*
+ * A limited implementation of fchownat() that only implements the
+ * functionality used by OpenSSH, currently only AT_FDCWD and
+ * AT_SYMLINK_NOFOLLOW.
+ */
+int
+fchownat(int fd, const char *path, uid_t owner, gid_t group, int flag)
+{
+        int ret, oflags = O_WRONLY;
+
+        if (fd != AT_FDCWD) {
+                errno = ENOSYS;
+                return -1;
+        }
+# ifndef HAVE_FCHOWN
+        return chown(pathname, owner, group);
+# else
+        if (flag & AT_SYMLINK_NOFOLLOW)
+                oflags |= O_NOFOLLOW;
+        if ((fd = open(path, oflags)) == -1)
+                return -1;
+        ret = fchown(fd, owner, group);
+        close(fd);
+        return ret;
+# endif
+}
+#endif
+
+#ifndef HAVE_FCHMODAT
+/*
+ * A limited implementation of fchmodat() that only implements the
+ * functionality used by OpenSSH, currently only AT_FDCWD and
+ * AT_SYMLINK_NOFOLLOW.
+ */
+int
+fchmodat(int fd, const char *path, mode_t mode, int flag)
+{
+        int ret, oflags = O_WRONLY;
+
+        if (fd != AT_FDCWD) {
+                errno = ENOSYS;
+                return -1;
+        }
+# ifndef HAVE_FCHMOD
+        return chown(pathname, owner, group);
+# else
+        if (flag & AT_SYMLINK_NOFOLLOW)
+                oflags |= O_NOFOLLOW;
+        if ((fd = open(path, oflags)) == -1)
+                return -1;
+        ret = fchmod(fd, mode);
+        close(fd);
+        return ret;
+# endif
+}
+#endif
+
 #ifndef HAVE_TRUNCATE
 int truncate(const char *path, off_t length)
 {