BOOT(9)

🌸 NAME 🌸

okay bestie, this is BOOT(9) from the Kernel Developer’s Manual, and the function is boot — halt or reboot the system. no cap, that’s the whole vibe 💅✨

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✨ SYNOPSIS ✨

#include <sys/reboot.h>

void
boot(int howto);

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💖 DESCRIPTION 💖

The boot() function handles final system shutdown, and either halts or reboots the system. The exact action to be taken is determined by the flags passed in howto and by whether or not the system has finished autoconfiguration. literally the final boss of shutdown 😭💀

If the system has finished autoconfiguration, boot() does the following:

1. Sets the boothowto system variable from the howto argument. putting it on the system’s profile, basically.
2. If this is the first invocation of boot() and the RB_NOSYNC flag is not set in howto, syncs and unmounts the system disks by calling vfs_shutdown() and sets the time of day clock by calling resettodr(9). cleanup era fr fr 🧚
3. Disables interrupts. quiet mode: activated. 🤫
4. If rebooting after a crash (i.e., if RB_DUMP is set in howto, but RB_HALT is not), saves a system crash dump. preserving the receipts for later 📸
5. Prints a message indicating that the system is about to be halted or rebooted. a lil’ goodbye note 🫶
6. If RB_HALT is set in howto, halts the system. Otherwise, reboots the system. choose your ending: nap time or comeback era 🔥

If the system has not finished autoconfiguration, boot() prints a message, and halts the system (unless RB_USERREQ is specified, in which case the system will be halted if RB_HALT is given, and rebooted otherwise; see reboot(2) for more details). iykyk, the flags decide the plot twist 🌈

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🦋 SEE ALSO 🦋

• reboot(2)
• resettodr(9)

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Debian · December 10, 2014 · BOOT(9) — that’s the whole page, periodt 💅✨🎀