Date: Wed, 5 Dec 2018 17:28:40 +0000 (UTC) From: Alan Somers <asomers@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r341598 - head/lib/libc/sys Message-ID: <201812051728.wB5HSes8099327@repo.freebsd.org>
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Author: asomers Date: Wed Dec 5 17:28:40 2018 New Revision: 341598 URL: https://svnweb.freebsd.org/changeset/base/341598 Log: stat(2): clarify which syscalls modify file timestamps The list of syscalls that modify st_atim, st_mtim, and st_ctim was quite out of date and probably not accurate to begin with. Update it, and make it clear that the list is open-ended. Reviewed by: kib MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D18410 Modified: head/lib/libc/sys/stat.2 Modified: head/lib/libc/sys/stat.2 ============================================================================== --- head/lib/libc/sys/stat.2 Wed Dec 5 17:13:33 2018 (r341597) +++ head/lib/libc/sys/stat.2 Wed Dec 5 17:28:40 2018 (r341598) @@ -28,7 +28,7 @@ .\" @(#)stat.2 8.4 (Berkeley) 5/1/95 .\" $FreeBSD$ .\" -.Dd November 11, 2018 +.Dd December 5, 2018 .Dt STAT 2 .Os .Sh NAME @@ -193,45 +193,53 @@ are: .Bl -tag -width ".Va st_birthtim" .It Va st_atim Time when file data was last accessed. -Changed by the -.Xr mknod 2 , -.Xr utimes 2 , +Changed implicitly by syscalls such as .Xr read 2 and -.Xr readv 2 -system calls. +.Xr readv 2 , +and explicitly by +.Xr utimes 2 . .It Va st_mtim Time when file data was last modified. -Changed by the +Changed implicitly by syscalls such as +.Xr truncate 2 , +.Xr write 2 , +and +.Xr writev 2 , +and explicitly by +.Xr utimes 2 . +Also, any syscall which modifies directory content changes the +.Va st_mtim +for the affected directory. +For instance, +.Xr creat 2 , .Xr mkdir 2 , -.Xr mkfifo 2 , -.Xr mknod 2 , -.Xr utimes 2 , -.Xr write 2 +.Xr rename 2 , +.Xr link 2 , and -.Xr writev 2 -system calls. +.Xr unlink 2 . .It Va st_ctim Time when file status was last changed (inode data modification). -Changed by the +Changed implicitly by any syscall that affects file metadata, including +.Va st_mtim , +such as .Xr chflags 2 , .Xr chmod 2 , .Xr chown 2 , +.Xr truncate 2 , +.Xr utimes 2 , +and +.Xr write 2 . +Also, any syscall which modifies directory content changes the +.Va st_ctim +for the affected directory. +For instance, .Xr creat 2 , -.Xr link 2 , .Xr mkdir 2 , -.Xr mkfifo 2 , -.Xr mknod 2 , .Xr rename 2 , -.Xr rmdir 2 , -.Xr symlink 2 , -.Xr truncate 2 , -.Xr unlink 2 , -.Xr utimes 2 , -.Xr write 2 +.Xr link 2 , and -.Xr writev 2 -system calls. +.Xr unlink 2 . .It Va st_birthtim Time when the inode was created. .El
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