[a / b / c / d / e / f / g / gif / h / hr / k / m / o / p / r / s / t / u / v / vg / vm / vmg / vr / vrpg / vst / w / wg] [i / ic] [r9k / s4s / vip] [cm / hm / lgbt / y] [3 / aco / adv / an / bant / biz / cgl / ck / co / diy / fa / fit / gd / hc / his / int / jp / lit / mlp / mu / n / news / out / po / pol / pw / qst / sci / soc / sp / tg / toy / trv / tv / vp / vt / wsg / wsr / x / xs] [Settings] [Search] [Mobile] [Home]
Board
▼ Settings Mobile Home
/g/ - Technology
Return Catalog Bottom Refresh
Name
Options
Comment
Verification
4chan Pass users can bypass this verification. [Learn More] [Login]
File
  • Please read the Rules and FAQ before posting.
  • You may highlight syntax and preserve whitespace by using [code] tags.
08/21/20New boards added: /vrpg/, /vmg/, /vst/ and /vm/
05/04/17New trial board added: /bant/ - International/Random
10/04/16New board for 4chan Pass users: /vip/ - Very Important Posts
[Hide] [Show All]
[Advertise on 4chan]
[Return] [Catalog] [Bottom]
Anonymous
syscall of the day: *xattr(at) No.108730420
File: LRNQWE3ABS.jpg (132 KB, 640x1867)
132 KB JPG
syscall of the day: *xattr(at) No.108730420
previous: >>108723814

#define __NR_setxattr                188
#define __NR_lsetxattr                189
#define __NR_fsetxattr                190
#define __NR_getxattr                191
#define __NR_lgetxattr                192
#define __NR_fgetxattr                193
#define __NR_listxattr                194
#define __NR_llistxattr                195
#define __NR_flistxattr                196
#define __NR_removexattr            197
#define __NR_lremovexattr            198
#define __NR_fremovexattr            199
#define __NR_setxattrat        463
#define __NR_getxattrat        464
#define __NR_listxattrat    465
#define __NR_removexattrat    466

https://man7.org/linux/man-pages/man7/xattr.7.html

tl;dr:
extended filesystem attributes

the manpage link above doesn't let you immediately jump to *every* xattr syscall manpage, but i believe that by now all of you should have figured out how to navigate the manpages on your own anyway. i believe in you!

basically, these let you set attributes on files (to include directories, etc.) in the form of atomic name:value pairs. the names can be further subdivided into classes, and these always form null-terminated strings. it seems like the value can be a mostly arbitrary length blob. of course, this means that querying for the length in order to allocate a buffer is inherently racy :^) yay linux!

anyone ever had a reason to use these before? i'm sure they're useful to someone, but that person isn't me

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/
>>
Anonymous
 No.108730432
No.108730432
I don't like xattr as a whole. It's one of those classic bolt-ons Linux is full of.
>>
Anonymous
 No.108730546
No.108730546
>>108730420
tranny image
>>
Anonymous
 No.108730827
No.108730827
>>108730546
OP is a literal tranny and it's honestly embarrassing he(she? hell if I know)'s responsible for the only high effort threads in the board
>>
Anonymous
 No.108731020
No.108731020
>>108730827
Yeah, besides the discord-tier slop images (which desu is probably what causes 90% of people to click on the thread) this is one of the few good threads that doesn't instantly die because of the 40 generals and constant bait posts this board is comprised of.
>>
Anonymous
 No.108731116
No.108731116
>>108731020
standard 4cuck experience. /g was fun and usefull for me during the first or second year of lurking, now there isnt much to learn from all the retards throwing shit at each other. its tiresome.
>>
Anonymous
 No.108731129
No.108731129
>>108730420
i love u
>>
Anonymous
 No.108731260
No.108731260
>>108730420
*xattr is one sexy syscall
>>
Anonymous
 No.108731802
No.108731802
>>108730827
it's like this in FOSS and open source too, nerds who develop gender dysphoria happen to be the smartest and most motivated people.
>>
Anonymous
 No.108732349
No.108732349
>>108730420
Fucking fairies.
>>
Anonymous
 No.108733656
No.108733656
>>108732349
yes please
>>
Anonymous
 No.108733925
No.108733925
>>108731129
ily2 anon
>>
Anonymous
 No.108734136
No.108734136
sexattr
>>
Anonymous
 No.108734168
No.108734168
>>108734136
with me?? >_<
>>
Anonymous
 No.108734190
No.108734190
>>108730432
looks extremely retarded to me. Why do it like this instead of just adding for file `x` another file `x.metadata` and thus keep your filesystems much simpler?
>>
Anonymous
 No.108734303
No.108734303
>>108734168
no unless fairy
>>
Anonymous
 No.108734320
No.108734320
>>108734303
I've been called as much before
>>
Anonymous
 No.108734336
No.108734336
>>108734190
literally the whole point is to not have to do that
it's not terribly implemented, it's just not particularly useful
>>
Anonymous
 No.108734470
No.108734470
>>108734168
yes
>>
Anonymous
 No.108734556
No.108734556
>>108734336
only way I can see this being useful is for certain user facing files, i.e. mp3 tagging. But then your xattrs must be portable accross filesystems
>>
Anonymous
 No.108735743
No.108735743
>>108730420
>of course, this means that querying for the length in order to allocate a buffer is inherently racy :^) yay linux!
Just call it in a loop with a progressively larger buffer until it doesn't fail with ERANGE, starting with an expected sane size, if it fits you're done with a single syscall, otherwise realloc and retry.
>>
Anonymous
 No.108735869
No.108735869
>getfattr
>>
Anonymous
 No.108736040
No.108736040
File: 1777708687922.jpg (105 KB, 1060x891)
105 KB JPG
>>108730420
>yet another set of syscalls with a wrapper in binutils
[Return] [Catalog] [Top]
Post a Reply
Return Catalog Top Refresh
[Advertise on 4chan]
Delete Post: [File Only] Style:
[Disable Mobile View / Use Desktop Site]

[Enable Mobile View / Use Mobile Site]

All trademarks and copyrights on this page are owned by their respective parties. Images uploaded are the responsibility of the Poster. Comments are owned by the Poster.