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docs/sysfs: show() methods should use scnprintf().

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Since snprintf() may return a value that exceeds its second argument,
show() methods should use scnprintf() instead of snprintf(). This patch
updates the example in the sysfs documentation accordingly.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Bart Van Assche 2010-12-21 13:09:47 +01:00 committed by Greg Kroah-Hartman
parent 5480bcdd60
commit d3f70befd9
1 changed files with 3 additions and 3 deletions
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6
Documentation/filesystems/sysfs.txt
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@ -210,9 +210,9 @@ Other notes:
is 4096.
- show() methods should return the number of bytes printed into the
buffer. This is the return value of snprintf().
buffer. This is the return value of scnprintf().
- show() should always use snprintf().
- show() should always use scnprintf().
- store() should return the number of bytes used from the buffer. If the
entire buffer has been used, just return the count argument.
@ -231,7 +231,7 @@ A very simple (and naive) implementation of a device attribute is:
static ssize_t show_name(struct device *dev, struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", dev->name);
return scnprintf(buf, PAGE_SIZE, "%s\n", dev->name);
}
static ssize_t store_name(struct device *dev, struct device_attribute *attr,