From: Christian Brauner <christian.brauner@ubuntu.com>
Date: Thu, 11 Feb 2021 13:39:58 +0000 (+0100)
Subject: string_utils: add proc_self_fd()
X-Git-Tag: lxc-5.0.0~291^2~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b7686ea7b660d89bf4290f64ca4331a8ddf74e3;p=thirdparty%2Flxc.git

string_utils: add proc_self_fd()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---

diff --git a/src/lxc/string_utils.h b/src/lxc/string_utils.h
index dd086cee7..c98429c09 100644
--- a/src/lxc/string_utils.h
+++ b/src/lxc/string_utils.h
@@ -149,4 +149,16 @@ static inline bool strequal(const char *str, const char *eq)
 		__ret_strnprintf;                                                 \
 	})
 
+static inline const char *proc_self_fd(int fd)
+{
+	static const char *invalid_fd_path = "/proc/self/fd/-EBADF";
+	static char buf[LXC_PROC_SELF_FD_LEN] = "/proc/self/fd/";
+
+	if (strnprintf(buf + STRLITERALLEN("/proc/self/fd/"),
+		       INTTYPE_TO_STRLEN(int), "%d", fd) < 0)
+		return invalid_fd_path;
+
+	return buf;
+}
+
 #endif /* __LXC_STRING_UTILS_H */