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Old 03-15-2007, 01:13 AM   #1
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system call to set file ACLs in linux

Hi all,

Can anybody tell me the answer of following query.

setfacl command uses which system call to set the ACLs of files &
directories in linux.

Kindly waiting for your reply.

Thanks & Regards,

Old 03-15-2007, 09:53 AM   #2
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You should be able to determine this using strace.
Old 04-25-2019, 05:06 AM   #3
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strace -f -s999 -v setfacl -m u:cirsan01:rwx myfile
tells it uses getxattr with attribute "system.posix_acl_access":

setxattr("myfile", "system.posix_acl_access", "\2\0\0\0\1\0\6\0\377\377\377\377\2\0\7\0aO\0\0\4\0\6\0\377\377\377\377\20\0\7\0\377\377\377\377 \0\4\0\377\377\377\377", 44, 0) = 0
Tested in Ubuntu 16.04 on an ext4 filesystem.


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