Clarify write usage in comment for /dev/chardev #326
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The original comment referred to /dev/hello, but the actual device created by the module is /dev/chardev. In addition, writing to /dev/chardev using output redirection (>) typically fails due to insufficient permissions, since redirection is handled by the shell before sudo applies. As a result, the device_write() function may never be entered. This change updates the comment to recommend using a pipe with `sudo tee`, which correctly elevates privileges and allows the write operation to reach the driver.
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Thank @minhsun-c for contributing! |
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The original comment referred to /dev/hello, but the actual device created by the module is /dev/chardev.
In addition, writing to /dev/chardev using output redirection (>) typically fails due to insufficient permissions, since redirection is handled by the shell before sudo applies. As a result, the device_write() function may never be entered.
This change updates the comment to recommend using a pipe with
sudo tee, which correctly elevates privileges and allows the write operation to reach the driver.Summary by Bito
This pull request clarifies the write operation for the /dev/chardev device by correcting the previous comment that referenced /dev/hello. It now includes guidance on using a pipe with `sudo tee` to address permission issues during output redirection.