If the named file has its immutable flag set, chmod(2) returns EPERM.
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@ -32,7 +32,7 @@
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.\" @(#)chmod.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd December 29, 2004
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.Dd December 9, 2006
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.Dt CHMOD 2
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.Os
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.Sh NAME
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@ -178,6 +178,10 @@ Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EPERM
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The effective user ID does not match the owner of the file and
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the effective user ID is not the super-user.
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.It Bq Er EPERM
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The named file has its immutable flag set, see the
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.Xr chflags 2
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manual page for more information.
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.It Bq Er EROFS
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The named file resides on a read-only file system.
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.It Bq Er EFAULT
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@ -209,6 +213,7 @@ An I/O error occurred while reading from or writing to the file system.
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.El
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.Sh SEE ALSO
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.Xr chmod 1 ,
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.Xr chflags 2 ,
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.Xr chown 2 ,
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.Xr open 2 ,
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.Xr stat 2 ,
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