vtpm_proxy_fops_read(9)

🌸 NAME 🌸

okay so bestie, this page is from the Kernel API Manual, and it's all about vtpm_proxy_fops_read — aka the function that does Read TPM commands on 'server side'. That's the name line, but make it cute: vtpm_proxy_fops_read = Read TPM commands on 'server side'. periodt. 🎀

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✨ SYNOPSIS ✨

here's the exact signature, character-for-character, no editing bestie:

ssize_t vtpm_proxy_fops_read (struct file *filp , char __user *buf ,
       size_t count , loff_t *off );

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🦋 ARGUMENTS 🦋

four arguments, let's go — no cap, they all matter:

• filp — file pointer. literally the file pointer. 💅
• buf — read buffer. the read buffer, bestie. 🫶
• count — number of bytes to read. the byte count. 🔥
• off — offset. the offset. ✨

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💖 RETURN 💖

Number of bytes read or negative error code.

that's the whole return vibe: you get the number of bytes read, or a negative error code. if it's negative, that's the error-code situation — don't ignore it. 😭

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👑 SEE ALSO 👑

if you're going spelunking, here's the crew:

• Kernel file: ./drivers/char/tpm/tpm_vtpm_proxy.c
• vtpm_proxy_fops_write(9)
• vtpm_proxy_fops_undo_open(9)
• vtpmx_ioc_new_dev(9)

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xoxo, your kernel bestie 💅 — this page's source/version is ./drivers/char/tpm, dated October 2026. go read some TPM commands, ily. 🫶