From: WanBingjiang <wanbingjiang@webray.com.cn>
Date: Tue, 7 Jul 2026 02:45:29 +0000 (+0800)
Subject: dmesg: treat EAGAIN from /dev/kmsg as EOF, not an error
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=095cb2daa6809b20bb7a8d775d1916723cdb1706;p=thirdparty%2Futil-linux.git

dmesg: treat EAGAIN from /dev/kmsg as EOF, not an error

Fixes: https://github.com/util-linux/util-linux/issues/4468
---

diff --git a/sys-utils/dmesg.c b/sys-utils/dmesg.c
index e39ec34a8..67d5e73dd 100644
--- a/sys-utils/dmesg.c
+++ b/sys-utils/dmesg.c
@@ -1419,6 +1419,9 @@ static ssize_t read_kmsg_one(struct dmesg_control *ctl)
 			    sizeof(ctl->kmsg_buf) - 1);
 	} while (size < 0 && errno == EPIPE);
 
+	if (size < 0 && errno == EAGAIN)
+		return 0;
+
 	return size;
 }