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Solaris sticky bit

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Operating Systems Solaris Solaris sticky bit
# 8  
Old 03-04-2014
@Don Cragun........What you say contradicts my longstanding generic understanding that 'sticky bits' cause a file to remain in virtual memory not become virtual memory. It is used (typically) on very frequently used executables to prevent them having to be loaded from disk every time thereby vastly improving load time of the application. Do correct me if I'm wrong.
# 9  
Old 03-04-2014
Quote:
Originally Posted by hicksd8
@Don Cragun........What you say contradicts my longstanding generic understanding that 'sticky bits' cause a file to remain in virtual memory not become virtual memory. It is used (typically) on very frequently used executables to prevent them having to be loaded from disk every time thereby vastly improving load time of the application. Do correct me if I'm wrong.
From the Solaris chmod(2) man page:
Quote:
If a directory is writable and has S_ISVTX (the sticky bit) set, files within that direc-
tory can be removed or renamed only if one or more of the following is true (see unlink(2)
and rename(2)):

o the user owns the file

o the user owns the directory

o the file is writable by the user

o the user is a privileged user

If a regular file is not executable and has S_ISVTX set, the file is assumed to be a swap
file. In this case, the system's page cache will not be used to hold the file's data. If
the S_ISVTX bit is set on any other file, the results are unspecified.
Your longstanding generic understanding is correct for executable files. A file that ls -l shows up as:
Code:
-rw-r--r-T 1 mark support 875166720 Mar 23 2005 file_mig.dat

as is being discussed in this thread, is not executable.
Last edited by Don Cragun; 03-04-2014 at 03:53 PM.. Reason: Add note about difference between executable and non-executable regular file sticky bit processing.
# 10  
Old 03-04-2014
@Don Cragun......Thanks. You learn something new every day!!! Great forum this!!
# 11  
Old 03-04-2014
Quote:
Originally Posted by Don Cragun
Your longstanding generic understanding is correct for executable files.
Actually, the page you quoted shows that Solaris does not work that way. I would be surprised if any OS released this century still behaves like that.
# 12  
Old 03-07-2014
Yes, IIRC it was SunOS 4, later named Solaris 1 (to boost the Solaris sales).
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