diff options
| author | peter <peter@FreeBSD.org> | 1996-05-24 16:32:11 +0000 |
|---|---|---|
| committer | peter <peter@FreeBSD.org> | 1996-05-24 16:32:11 +0000 |
| commit | 0f5a7440b6758c699bf0520a7e28678f05d269a7 (patch) | |
| tree | dad89c1fa460db1f6a988e262d7f74fbbd63fcf7 /lib/libc/sys | |
| parent | 9453593a7d6b8b4929584c55937cbc51e5de1a67 (diff) | |
| download | FreeBSD-src-0f5a7440b6758c699bf0520a7e28678f05d269a7.zip FreeBSD-src-0f5a7440b6758c699bf0520a7e28678f05d269a7.tar.gz | |
Document that the superuser cannot override link() and unlink() on
directories, and mention that it was historical practice.
Diffstat (limited to 'lib/libc/sys')
| -rw-r--r-- | lib/libc/sys/link.2 | 11 | ||||
| -rw-r--r-- | lib/libc/sys/unlink.2 | 11 |
2 files changed, 17 insertions, 5 deletions
diff --git a/lib/libc/sys/link.2 b/lib/libc/sys/link.2 index d160786..4c27ab9 100644 --- a/lib/libc/sys/link.2 +++ b/lib/libc/sys/link.2 @@ -74,7 +74,6 @@ both and .Fa name2 must be in the same file system. -Unless the caller is the super-user, .Fa name1 may not be a directory. .Sh RETURN VALUES @@ -113,8 +112,7 @@ does exist. .It Bq Er EPERM The file named by .Fa name1 -is a directory and the effective -user ID is not super-user. +is a directory. .It Bq Er EXDEV The link named by .Fa name2 @@ -149,3 +147,10 @@ is outside the process's allocated address space. is expected to conform to IEEE Std 1003.1-1988 .Pq Dq Tn POSIX . +.Sh HISTORY +.Pp +The +.Nm +system call traditionally allows the super-user to link directories which +corrupts the filesystem coherency. This implementation no longer permits +it. diff --git a/lib/libc/sys/unlink.2 b/lib/libc/sys/unlink.2 index 78221bc..1f46945 100644 --- a/lib/libc/sys/unlink.2 +++ b/lib/libc/sys/unlink.2 @@ -56,6 +56,8 @@ all resources associated with the file are reclaimed. If one or more process have the file open when the last link is removed, the link is removed, but the removal of the file is delayed until all references to it have been closed. +.Fa path +may not be a directory. .Sh RETURN VALUES Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and @@ -83,8 +85,7 @@ to be removed. .It Bq Er ELOOP Too many symbolic links were encountered in translating the pathname. .It Bq Er EPERM -The named file is a directory and the effective user ID -of the process is not the super-user. +The named file is a directory. .It Bq Er EPERM The directory containing the file is marked sticky, and neither the containing directory nor the file to be removed @@ -110,3 +111,9 @@ points outside the process's allocated address space. An .Nm function call appeared in Version 6 AT&T UNIX. +.Pp +The +.Nm +system call traditionally allows the super-user to unlink directories which +can damage the filesystem integrity. This implementation no longer permits +it. |
