Prep v230: Apply missing upstream fixes and updates (2/8) src/basic.

[elogind.git] / src / basic / fd-util.c

diff --git a/src/basic/fd-util.c b/src/basic/fd-util.c
index 9c15b91c312dd5c8a90127cd3a941182f5b0e3c7..8e4cfe3fe4084fec6f7c8b5d0654329821dfcc48 100644 (file)
--- a/src/basic/fd-util.c
+++ b/src/basic/fd-util.c
@@ -359,4 +359,18 @@ bool fdname_is_valid(const char *s) {
 
         return p - s < 256;
 }
+
+int fd_get_path(int fd, char **ret) {
+        char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
+        int r;
+
+        xsprintf(procfs_path, "/proc/self/fd/%i", fd);
+
+        r = readlink_malloc(procfs_path, ret);
+
+        if (r == -ENOENT) /* If the file doesn't exist the fd is invalid */
+                return -EBADF;
+
+        return r;
+}
 #endif // 0