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Feature Add support of os.chflags() on Linux platform #75494

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Feature Add support of os.chflags() on Linux platform#75494
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3.7 (EOL)end of lifestdlibStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancement

Description

@socketpair
socketpair
mannequin
opened on Aug 31, 2017
BPO 31313
Nosy @pitrou, @larryhastings, @socketpair
Files
  • chiflag.c
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = None
created_at = <Date 2017-08-31.09:55:01.045>
labels = ['3.7', 'type-feature', 'library']
title = 'Feature Add support of os.chflags() on Linux platform'
updated_at = <Date 2017-09-01.09:27:54.508>
user = 'https://github.com/socketpair'

    bugs.python.org fields:

    activity = <Date 2017-09-01.09:27:54.508>
actor = 'pitrou'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-08-31.09:55:01.045>
creator = 'socketpair'
dependencies = []
files = ['47115']
hgrepos = []
issue_num = 31313
keywords = []
message_count = 5.0
messages = ['301043', '301046', '301089', '301091', '301092']
nosy_count = 4.0
nosy_names = ['pitrou', 'larry', 'neologix', 'socketpair']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue31313'
versions = ['Python 3.7']

    Activity

    1. socketpair commented on Aug 31, 2017

      @socketpair
      socketpairmannequin
      on Aug 31, 2017
      MannequinAuthor

      Yes, chflags() is not supported by linux directly. But actually, Linux supports chflags functionality:

      https://stackoverflow.com/questions/34176464/why-os-chflags-doesnt-work-under-linux

      through

      ioctl (fd, EXT2_IOC_SETFLAGS, <BITMASK_OF_FLAGS>)

    2. socketpair
      added
      3.7 (EOL)end of life
      stdlibStandard Library Python modules in the Lib/ directory
      type-featureA feature request or enhancement
      on Aug 31, 2017

    3. pitrou commented on Aug 31, 2017

      @pitrou
      pitrou
      on Aug 31, 2017
      Member

      Judging by the ioctl name, this is ext2/ext3/ext4 specific?

    4. socketpair commented on Sep 1, 2017

      @socketpair
      socketpairmannequin
      on Sep 1, 2017
      MannequinAuthor

      Well, it seems, you are right.

      But there are another ioctls (maybe they are the same, I haven't checked):

      FS_IOC_SETFLAGS
      FS_IOC_GETFLAGS

      http://man7.org/tlpi/code/online/book/files/chiflag.c.html (also attached)

    5. pitrou commented on Sep 1, 2017

      @pitrou
      pitrou
      on Sep 1, 2017
      Member

      On Ubuntu 16.04 I get the following values:
      EXT2_IOC_SETFLAGS = 0x40086602, FS_IOC_GETFLAGS = 0x80086601

    6. pitrou commented on Sep 1, 2017

      @pitrou
      pitrou
      on Sep 1, 2017
      Member

      Uh, of course, we care about SETFLAGS here. Which gives:
      EXT2_IOC_SETFLAGS = 0x40086602, FS_IOC_SETFLAGS = 0x40086602

    7. ezio-melotti
      transferred this issue fromon Apr 10, 2022
    8. serhiy-storchaka
      added this to OS issues 💻on Jul 3, 2026
    9. github-project-automation
      moved this to Todo in OS issues 💻on Jul 3, 2026

    10. encukou commented on Aug 25, 2026

      @encukou
      encukou
      on Aug 25, 2026
      Member

      FS_IOC flags are different from the stat.UF_* & stat.SF_* that os.chflags operates on.
      If we add them, they should use a different function, perhaps in fcntl or around statx, or use the chattr name.

      Feature proposals should go on Discourse nowadays; ideally with a use case.

    11. encukou
      closed this as completedon Aug 25, 2026
    12. github-project-automation
      moved this from Todo to Done in OS issues 💻on Aug 25, 2026
    13. encukou
      marked Linux's chattr i.e. ioctl(FS_IOC_SETFLAGS) is not supported in os.chflags() #87105 as a duplicate of this issue on Aug 25, 2026
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