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Full Discussion: Before I delete any file in Unix, How can I check no open file handle is pointing to that file?
Operating Systems Solaris Before I delete any file in Unix, How can I check no open file handle is pointing to that file? Post 302459828 by achenle on Tuesday 5th of October 2010 12:34:37 PM
Old 10-05-2010
Yes - it's "fuser".

And FWIW, assuming you're running on Solaris (as this is posted under the Solaris topic...), fuser on Solaris is a lot faster than lsof on Linux. The last time I looked at the lsof source code it was doing nothing more than searching through the entire /proc file system looking for a match to the file(s) it was given. The Solaris implementation of fuser operates fully inside the kernel (see /usr/include/sys/utssys.h on a Solaris box for the actual system call that does the work) and it seems to me that the Solaris kernel pretty much has to have a direct way of finding the processes that have that file open since it returns so fast - it seems way too fast to be searching unless what it's searching is really small.
 

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LEARN ABOUT OPENSOLARIS

intro

Intro(9S)						    Data Structures for Drivers 						 Intro(9S)

NAME

       Intro, intro - introduction to kernel data structures and properties

DESCRIPTION

       Section	9P  describes kernel properties used by device drivers. Section 9S describes the data structures used by drivers to share informa-
       tion between the driver and the kernel. See Intro(9E) for an overview of device driver interfaces.

       In Section 9S, reference pages contain the following headings:

	   o	  NAME summarizes the purpose of the structure or property.

	   o	  SYNOPSIS lists the include file that defines the structure or property.

	   o	  INTERFACE LEVEL describes any architecture dependencies.

	   o	  DESCRIPTION provides general information about the structure or property.

	   o	  STRUCTURE MEMBERS lists all accessible structure members (for Section 9S).

	   o	  SEE ALSO gives sources for further information.

       Of the preceding headings, Section 9P reference pages contain the NAME, DESCRIPTION, and SEE ALSO fields.

       Every driver MUST include <sys/ddi.h> and <sys/sunddi.h>, in that order, and as final entries.

       The following table summarizes the STREAMS structures described in Section 9S.

       +-----------------------------+-----------------------------+
       |	 Structure	     |		  Type		   |
       +-----------------------------+-----------------------------+
       |copyreq 		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |copyresp		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |datab			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |fmodsw			     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |free_rtn		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |iocblk			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |linkblk 		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |module_info		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |msgb			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |qband			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |qinit			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |queclass		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |queue			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |streamtab		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |stroptions		     |DDI/DKI			   |
       +-----------------------------+-----------------------------+

       The following table summarizes structures that are not specific to STREAMS I/O.

       +-----------------------------+-----------------------------+
       |	 Structure	     |		  Type		   |
       +-----------------------------+-----------------------------+
       |aio_req 		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |buf			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |cb_ops			     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_device_acc_attr	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dma_attr		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dma_cookie		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dma_lim_sparc	     |Solaris SPARC DDI 	   |
       +-----------------------------+-----------------------------+
       |ddi_dma_lim_x86 	     |Solaris x86 DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dma_req		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_dmae_req		     |Solaris x86 DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_idevice_cookie	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |ddi_mapdev_ctl		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |devmap_callback_ctl	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |dev_ops 		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |iovec			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |kstat			     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |kstat_intr		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |kstat_io		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |kstat_named		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |map			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+
       |modldrv 		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |modlinkage		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |modlstrmod		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_address		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_arq_status 	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_device		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_extended_sense	     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_hba_tran		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_inquiry		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_pkt		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |scsi_status		     |Solaris DDI		   |
       +-----------------------------+-----------------------------+
       |uio			     |DDI/DKI			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Intro(9E)

NOTES

       Do not declare arrays of structures as the size of the structures can change between releases. Rely only on the structure members listed in
       this chapter and not on unlisted members or the position of a member in a structure.

SunOS 5.11							    15 May 2001 							 Intro(9S)
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