* [PATCH] stddev: make reads from /dev/null return 0 bytes
@ 2025-04-22 7:54 Ahmad Fatoum
2025-04-22 9:23 ` Sascha Hauer
0 siblings, 1 reply; 2+ messages in thread
From: Ahmad Fatoum @ 2025-04-22 7:54 UTC (permalink / raw)
To: barebox; +Cc: Ahmad Fatoum
Currently, /dev/null discards all writes, but returns -ENOSYS on read.
Implement read to return 0 always, so it returns EOF immediately.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
commands/stddev.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/commands/stddev.c b/commands/stddev.c
index e9b7dcc0d2f3..16cf4e30802d 100644
--- a/commands/stddev.c
+++ b/commands/stddev.c
@@ -64,8 +64,14 @@ static ssize_t null_write(struct cdev *cdev, const void *buf, size_t count, loff
return count;
}
+static ssize_t null_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
+{
+ return 0;
+}
+
static struct cdev_operations nullops = {
.write = null_write,
+ .read = null_read,
};
static int null_init(void)
--
2.39.5
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2025-04-22 9:23 ` Sascha Hauer
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