/g/ - Thread 108301681

Anonymous
syscall of the day: (f)truncate 03/05/26(Thu)15:20:54 No.108301681

syscall of the day: (f)truncate Anonymous 03/05/26(Thu)15:20:54 No.108301681 [Reply]▶

File: 1770469383193867.png (459.3 KB)

previous: >>108292753
#define __NR_truncate            76
#define __NR_ftruncate            77
https://man7.org/linux/man-pages/man2/truncate.2.html

tl;dr:
set a file to a specific length

that's all you're getting from me today because i'm in a rush
only other thing i will add is it's pretty bizarre (from a naming perspective) that you can "truncate" a file to a larger size

relevant resources:
man man
man syscalls
https://man7.org/linux/man-pages/
https://linux.die.net/man/
https://elixir.bootlin.com/linux/
https://elixir.bootlin.com/musl/
https://elixir.bootlin.com/glibc/

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>>

Anonymous
03/05/26(Thu)16:25:03 No.108302139

Anonymous 03/05/26(Thu)16:25:03 No.108302139▶

The name is bizarre, but how else would you enlarge a file that you only ever map into your process? If you don't write() to it it never gets bigger.

Hence the ftruncate.

>>

Anonymous
03/05/26(Thu)21:15:09 No.108304274

Anonymous 03/05/26(Thu)21:15:09 No.108304274▶

Bump.

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